Setup project skeleton

18 files changed, 1289 insertions, 14 deletions

diff --git a/src/libc/include/ctype.h b/src/libc/include/ctype.h
new file mode 100644
index 0000000..861da65
--- /dev/null
+++ b/src/libc/include/ctype.h
@@ -0,0 +1,29 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef _CTYPE_H
+#define _CTYPE_H
+
+int isalpha(int __c);
+int islower(int __c);
+int isspace(int __c);
+int isupper(int __c);
+int tolower(int __c);
+int toupper(int __c);
+
+#endif
diff --git a/src/libc/include/errno.h b/src/libc/include/errno.h
index 0456645..3646089 100644
--- a/src/libc/include/errno.h
+++ b/src/libc/include/errno.h
@@ -1,3 +1,38 @@
+/* Copyright (C) 1991-2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 #ifndef _ERRNO_H
 #define _ERRNO_H
 
@@ -5,7 +40,7 @@ extern int errno;
 
 enum
 {
-    OK,
+    SUCCESS,
     EPERM,
     ENOENT,
     ESRCH,
@@ -38,6 +73,105 @@ enum
     EROFS,
     EMLINK,
     EPIPE,
+    EDOM,
+    ERANGE,
+    EDEADLK,
+    ENAMETOOLONG,
+    ENOLCK,
+    ENOSYS,
+    ENOTEMPTY,
+    ELOOP,
+    ENOMSG,
+    EIDRM,
+    ECHRNG,
+    EL2NSYNC,
+    EL3HLT,
+    EL3RST,
+    ELNRNG,
+    EUNATCH,
+    ENOCSI,
+    EL2HLT,
+    EBADE,
+    EBADR,
+    EXFULL,
+    ENOANO,
+    EBADRQC,
+    EBADSLT,
+    EBFONT,
+    ENOSTR,
+    ENODATA,
+    ETIME,
+    ENOSR,
+    ENONET,
+    ENOPKG,
+    EREMOTE,
+    ENOLINK,
+    EADV,
+    ESRMNT,
+    ECOMM,
+    EPROTO,
+    EMULTIHOP,
+    EDOTDOT,
+    EBADMSG,
+    EOVERFLOW,
+    ENOTUNIQ,
+    EBADFD,
+    EREMCHG,
+    ELIBACC,
+    ELIBBAD,
+    ELIBSCN,
+    ELIBMAX,
+    ELIBEXEC,
+    EILSEQ,
+    ERESTART,
+    ESTRPIPE,
+    EUSERS,
+    ENOTSOCK,
+    EDESTADDRREQ,
+    EMSGSIZE,
+    EPROTOTYPE,
+    ENOPROTOOPT,
+    EPROTONOSUPPORT,
+    ESOCKTNOSUPPORT,
+    ENOTSUP,
+    EPFNOSUPPORT,
+    EAFNOSUPPORT,
+    EADDRINUSE,
+    EADDRNOTAVAIL,
+    ENETDOWN,
+    ENETUNREACH,
+    ENETRESET,
+    ECONNABORTED,
+    ECONNRESET,
+    ENOBUFS,
+    EISCONN,
+    ENOTCONN,
+    ESHUTDOWN,
+    ETOOMANYREFS,
+    ETIMEDOUT,
+    ECONNREFUSED,
+    EHOSTDOWN,
+    EHOSTUNREACH,
+    EALREADY,
+    EINPROGRESS,
+    ESTALE,
+    EUCLEAN,
+    ENOTNAM,
+    ENAVAIL,
+    EISNAM,
+    EREMOTEIO,
+    EDQUOT,
+    ENOMEDIUM,
+    EMEDIUMTYPE,
+    ECANCELED,
+    ENOKEY,
+    EKEYEXPIRED,
+    EKEYREVOKED,
+    EKEYREJECTED,
+    EOWNERDEAD,
+    ENOTRECOVERABLE,
+    ERFKILL,
+    EHWPOISON
 };
 
 #endif
diff --git a/src/libc/include/fcntl.h b/src/libc/include/fcntl.h
new file mode 100644
index 0000000..282ced8
--- /dev/null
+++ b/src/libc/include/fcntl.h
@@ -0,0 +1,29 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef _FCNTL_H
+#define _FCNTL_H
+
+enum
+{
+    O_RDONLY = 1,
+    O_WRONLY = 1 << 1,
+    O_RDWR = O_RDONLY | O_WRONLY
+};
+
+#endif
diff --git a/src/libc/include/inttypes.h b/src/libc/include/inttypes.h
new file mode 100644
index 0000000..afb424c
--- /dev/null
+++ b/src/libc/include/inttypes.h
@@ -0,0 +1,34 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+#ifndef _INTTYPES_H
+#define _INTTYPES_H
+
+#define PRIu8 "hhu"
+#define PRIu16 "hu"
+#define PRIu32 "lu"
+#define PRIu64 "llu"
+#define PRIi8 "hhd"
+#define PRIi16 "hd"
+#define PRIi32 "ld"
+#define PRIi64 "lld"
+#define PRIx8 "hhx"
+#define PRIx16 "hx"
+#define PRIx32 "lx"
+#define PRIx64 "llx"
+
+#endif
diff --git a/src/libc/include/limits.h b/src/libc/include/limits.h
new file mode 100644
index 0000000..6c50848
--- /dev/null
+++ b/src/libc/include/limits.h
@@ -0,0 +1,152 @@
+/* Copyright (C) 1991-2018 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef _LIMITS_H___
+#define _LIMITS_H___
+
+/* Number of bits in a `char'.  */
+#undef CHAR_BIT
+#define CHAR_BIT __CHAR_BIT__
+
+/* Maximum length of a multibyte character.  */
+#ifndef MB_LEN_MAX
+#define MB_LEN_MAX 1
+#endif
+
+/* Minimum and maximum values a `signed char' can hold.  */
+#undef SCHAR_MIN
+#define SCHAR_MIN (-SCHAR_MAX - 1)
+#undef SCHAR_MAX
+#define SCHAR_MAX __SCHAR_MAX__
+
+/* Maximum value an `unsigned char' can hold.  (Minimum is 0).  */
+#undef UCHAR_MAX
+#if __SCHAR_MAX__ == __INT_MAX__
+# define UCHAR_MAX (SCHAR_MAX * 2U + 1U)
+#else
+# define UCHAR_MAX (SCHAR_MAX * 2 + 1)
+#endif
+
+/* Minimum and maximum values a `char' can hold.  */
+#ifdef __CHAR_UNSIGNED__
+# undef CHAR_MIN
+# if __SCHAR_MAX__ == __INT_MAX__
+#  define CHAR_MIN 0U
+# else
+#  define CHAR_MIN 0
+# endif
+# undef CHAR_MAX
+# define CHAR_MAX UCHAR_MAX
+#else
+# undef CHAR_MIN
+# define CHAR_MIN SCHAR_MIN
+# undef CHAR_MAX
+# define CHAR_MAX SCHAR_MAX
+#endif
+
+/* Minimum and maximum values a `signed short int' can hold.  */
+#undef SHRT_MIN
+#define SHRT_MIN (-SHRT_MAX - 1)
+#undef SHRT_MAX
+#define SHRT_MAX __SHRT_MAX__
+
+/* Maximum value an `unsigned short int' can hold.  (Minimum is 0).  */
+#undef USHRT_MAX
+#if __SHRT_MAX__ == __INT_MAX__
+# define USHRT_MAX (SHRT_MAX * 2U + 1U)
+#else
+# define USHRT_MAX (SHRT_MAX * 2 + 1)
+#endif
+
+/* Minimum and maximum values a `signed int' can hold.  */
+#undef INT_MIN
+#define INT_MIN (-INT_MAX - 1)
+#undef INT_MAX
+#define INT_MAX __INT_MAX__
+
+/* Maximum value an `unsigned int' can hold.  (Minimum is 0).  */
+#undef UINT_MAX
+#define UINT_MAX (INT_MAX * 2U + 1U)
+
+/* Minimum and maximum values a `signed long int' can hold.
+   (Same as `int').  */
+#undef LONG_MIN
+#define LONG_MIN (-LONG_MAX - 1L)
+#undef LONG_MAX
+#define LONG_MAX __LONG_MAX__
+
+/* Maximum value an `unsigned long int' can hold.  (Minimum is 0).  */
+#undef ULONG_MAX
+#define ULONG_MAX (LONG_MAX * 2UL + 1UL)
+
+#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+/* Minimum and maximum values a `signed long long int' can hold.  */
+# undef LLONG_MIN
+# define LLONG_MIN (-LLONG_MAX - 1LL)
+# undef LLONG_MAX
+# define LLONG_MAX __LONG_LONG_MAX__
+
+/* Maximum value an `unsigned long long int' can hold.  (Minimum is 0).  */
+# undef ULLONG_MAX
+# define ULLONG_MAX (LLONG_MAX * 2ULL + 1ULL)
+#endif
+
+#if defined (__GNU_LIBRARY__) ? defined (__USE_GNU) : !defined (__STRICT_ANSI__)
+/* Minimum and maximum values a `signed long long int' can hold.  */
+# undef LONG_LONG_MIN
+# define LONG_LONG_MIN (-LONG_LONG_MAX - 1LL)
+# undef LONG_LONG_MAX
+# define LONG_LONG_MAX __LONG_LONG_MAX__
+
+/* Maximum value an `unsigned long long int' can hold.  (Minimum is 0).  */
+# undef ULONG_LONG_MAX
+# define ULONG_LONG_MAX (LONG_LONG_MAX * 2ULL + 1ULL)
+#endif
+
+#ifdef __STDC_WANT_IEC_60559_BFP_EXT__
+/* TS 18661-1 widths of integer types.  */
+# undef CHAR_WIDTH
+# define CHAR_WIDTH __SCHAR_WIDTH__
+# undef SCHAR_WIDTH
+# define SCHAR_WIDTH __SCHAR_WIDTH__
+# undef UCHAR_WIDTH
+# define UCHAR_WIDTH __SCHAR_WIDTH__
+# undef SHRT_WIDTH
+# define SHRT_WIDTH __SHRT_WIDTH__
+# undef USHRT_WIDTH
+# define USHRT_WIDTH __SHRT_WIDTH__
+# undef INT_WIDTH
+# define INT_WIDTH __INT_WIDTH__
+# undef UINT_WIDTH
+# define UINT_WIDTH __INT_WIDTH__
+# undef LONG_WIDTH
+# define LONG_WIDTH __LONG_WIDTH__
+# undef ULONG_WIDTH
+# define ULONG_WIDTH __LONG_WIDTH__
+# undef LLONG_WIDTH
+# define LLONG_WIDTH __LONG_LONG_WIDTH__
+# undef ULLONG_WIDTH
+# define ULLONG_WIDTH __LONG_LONG_WIDTH__
+#endif
+
+#endif /* _LIMITS_H___ */
diff --git a/src/libc/include/setjmp.h b/src/libc/include/setjmp.h
new file mode 100644
index 0000000..d372c91
--- /dev/null
+++ b/src/libc/include/setjmp.h
@@ -0,0 +1,29 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef _STDJUMP_H
+#define _STDJUMP_H
+
+typedef struct
+{
+    unsigned pc, sp, fp, s0, s1, s2, s3, s4, s5, s6, s7, gp;
+} jmp_buf[1];
+
+int setjmp(jmp_buf __env);
+
+#endif
diff --git a/src/libc/include/stdarg.h b/src/libc/include/stdarg.h
new file mode 100644
index 0000000..eeb4d3f
--- /dev/null
+++ b/src/libc/include/stdarg.h
@@ -0,0 +1,127 @@
+/* Copyright (C) 1989-2018 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+/*
+ * ISO C Standard:  7.15  Variable arguments  <stdarg.h>
+ */
+
+#ifndef _STDARG_H
+#ifndef _ANSI_STDARG_H_
+#ifndef __need___va_list
+#define _STDARG_H
+#define _ANSI_STDARG_H_
+#endif /* not __need___va_list */
+#undef __need___va_list
+
+/* Define __gnuc_va_list.  */
+
+#ifndef __GNUC_VA_LIST
+#define __GNUC_VA_LIST
+typedef __builtin_va_list __gnuc_va_list;
+#endif
+
+/* Define the standard macros for the user,
+   if this invocation was from the user program.  */
+#ifdef _STDARG_H
+
+#define va_start(v,l)	__builtin_va_start(v,l)
+#define va_end(v)	__builtin_va_end(v)
+#define va_arg(v,l)	__builtin_va_arg(v,l)
+#if !defined(__STRICT_ANSI__) || __STDC_VERSION__ + 0 >= 199900L \
+    || __cplusplus + 0 >= 201103L
+#define va_copy(d,s)	__builtin_va_copy(d,s)
+#endif
+#define __va_copy(d,s)	__builtin_va_copy(d,s)
+
+/* Define va_list, if desired, from __gnuc_va_list. */
+/* We deliberately do not define va_list when called from
+   stdio.h, because ANSI C says that stdio.h is not supposed to define
+   va_list.  stdio.h needs to have access to that data type,
+   but must not use that name.  It should use the name __gnuc_va_list,
+   which is safe because it is reserved for the implementation.  */
+
+#ifdef _BSD_VA_LIST
+#undef _BSD_VA_LIST
+#endif
+
+#if defined(__svr4__) || (defined(_SCO_DS) && !defined(__VA_LIST))
+/* SVR4.2 uses _VA_LIST for an internal alias for va_list,
+   so we must avoid testing it and setting it here.
+   SVR4 uses _VA_LIST as a flag in stdarg.h, but we should
+   have no conflict with that.  */
+#ifndef _VA_LIST_
+#define _VA_LIST_
+#ifdef __i860__
+#ifndef _VA_LIST
+#define _VA_LIST va_list
+#endif
+#endif /* __i860__ */
+typedef __gnuc_va_list va_list;
+#ifdef _SCO_DS
+#define __VA_LIST
+#endif
+#endif /* _VA_LIST_ */
+#else /* not __svr4__ || _SCO_DS */
+
+/* The macro _VA_LIST_ is the same thing used by this file in Ultrix.
+   But on BSD NET2 we must not test or define or undef it.
+   (Note that the comments in NET 2's ansi.h
+   are incorrect for _VA_LIST_--see stdio.h!)  */
+#if !defined (_VA_LIST_) || defined (__BSD_NET2__) || defined (____386BSD____) || defined (__bsdi__) || defined (__sequent__) || defined (__FreeBSD__) || defined(WINNT)
+/* The macro _VA_LIST_DEFINED is used in Windows NT 3.5  */
+#ifndef _VA_LIST_DEFINED
+/* The macro _VA_LIST is used in SCO Unix 3.2.  */
+#ifndef _VA_LIST
+/* The macro _VA_LIST_T_H is used in the Bull dpx2  */
+#ifndef _VA_LIST_T_H
+/* The macro __va_list__ is used by BeOS.  */
+#ifndef __va_list__
+typedef __gnuc_va_list va_list;
+#endif /* not __va_list__ */
+#endif /* not _VA_LIST_T_H */
+#endif /* not _VA_LIST */
+#endif /* not _VA_LIST_DEFINED */
+#if !(defined (__BSD_NET2__) || defined (____386BSD____) || defined (__bsdi__) || defined (__sequent__) || defined (__FreeBSD__))
+#define _VA_LIST_
+#endif
+#ifndef _VA_LIST
+#define _VA_LIST
+#endif
+#ifndef _VA_LIST_DEFINED
+#define _VA_LIST_DEFINED
+#endif
+#ifndef _VA_LIST_T_H
+#define _VA_LIST_T_H
+#endif
+#ifndef __va_list__
+#define __va_list__
+#endif
+
+#endif /* not _VA_LIST_, except on certain systems */
+
+#endif /* not __svr4__ */
+
+#endif /* _STDARG_H */
+
+#endif /* not _ANSI_STDARG_H_ */
+#endif /* not _STDARG_H */
diff --git a/src/libc/include/stdbool.h b/src/libc/include/stdbool.h
new file mode 100644
index 0000000..aa55406
--- /dev/null
+++ b/src/libc/include/stdbool.h
@@ -0,0 +1,54 @@
+/* Copyright (C) 1998-2018 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+/*
+ * ISO C Standard:  7.16  Boolean type and values  <stdbool.h>
+ */
+
+#ifndef _STDBOOL_H
+#define _STDBOOL_H
+
+#ifndef __cplusplus
+
+#define bool	_Bool
+#define true	1
+#define false	0
+
+#else /* __cplusplus */
+
+/* Supporting _Bool in C++ is a GCC extension.  */
+#define _Bool	bool
+
+#if __cplusplus < 201103L
+/* Defining these macros in C++98 is a GCC extension.  */
+#define bool	bool
+#define false	false
+#define true	true
+#endif
+
+#endif /* __cplusplus */
+
+/* Signal that all the definitions are present.  */
+#define __bool_true_false_are_defined	1
+
+#endif	/* stdbool.h */
diff --git a/src/libc/include/stddef.h b/src/libc/include/stddef.h
new file mode 100644
index 0000000..31b96a7
--- /dev/null
+++ b/src/libc/include/stddef.h
@@ -0,0 +1,451 @@
+/* Copyright (C) 1989-2018 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+/*
+ * ISO C Standard:  7.17  Common definitions  <stddef.h>
+ */
+#if (!defined(_STDDEF_H) && !defined(_STDDEF_H_) && !defined(_ANSI_STDDEF_H) \
+     && !defined(__STDDEF_H__)) \
+    || defined(__need_wchar_t) || defined(__need_size_t) \
+    || defined(__need_ptrdiff_t) || defined(__need_NULL) \
+    || defined(__need_wint_t)
+
+/* Any one of these symbols __need_* means that GNU libc
+   wants us just to define one data type.  So don't define
+   the symbols that indicate this file's entire job has been done.  */
+#if (!defined(__need_wchar_t) && !defined(__need_size_t)	\
+     && !defined(__need_ptrdiff_t) && !defined(__need_NULL)	\
+     && !defined(__need_wint_t))
+#define _STDDEF_H
+#define _STDDEF_H_
+/* snaroff@next.com says the NeXT needs this.  */
+#define _ANSI_STDDEF_H
+#endif
+
+#ifndef __sys_stdtypes_h
+/* This avoids lossage on SunOS but only if stdtypes.h comes first.
+   There's no way to win with the other order!  Sun lossage.  */
+
+/* On 4.3bsd-net2, make sure ansi.h is included, so we have
+   one less case to deal with in the following.  */
+#if defined (__BSD_NET2__) || defined (____386BSD____) || (defined (__FreeBSD__) && (__FreeBSD__ < 5)) || defined(__NetBSD__)
+#include <machine/ansi.h>
+#endif
+/* On FreeBSD 5, machine/ansi.h does not exist anymore... */
+#if defined (__FreeBSD__) && (__FreeBSD__ >= 5)
+#include <sys/_types.h>
+#endif
+
+/* In 4.3bsd-net2, machine/ansi.h defines these symbols, which are
+   defined if the corresponding type is *not* defined.
+   FreeBSD-2.1 defines _MACHINE_ANSI_H_ instead of _ANSI_H_.
+   NetBSD defines _I386_ANSI_H_ and _X86_64_ANSI_H_ instead of _ANSI_H_ */
+#if defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_) || defined(_X86_64_ANSI_H_)  || defined(_I386_ANSI_H_)
+#if !defined(_SIZE_T_) && !defined(_BSD_SIZE_T_)
+#define _SIZE_T
+#endif
+#if !defined(_PTRDIFF_T_) && !defined(_BSD_PTRDIFF_T_)
+#define _PTRDIFF_T
+#endif
+/* On BSD/386 1.1, at least, machine/ansi.h defines _BSD_WCHAR_T_
+   instead of _WCHAR_T_. */
+#if !defined(_WCHAR_T_) && !defined(_BSD_WCHAR_T_)
+#ifndef _BSD_WCHAR_T_
+#define _WCHAR_T
+#endif
+#endif
+/* Undef _FOO_T_ if we are supposed to define foo_t.  */
+#if defined (__need_ptrdiff_t) || defined (_STDDEF_H_)
+#undef _PTRDIFF_T_
+#undef _BSD_PTRDIFF_T_
+#endif
+#if defined (__need_size_t) || defined (_STDDEF_H_)
+#undef _SIZE_T_
+#undef _BSD_SIZE_T_
+#endif
+#if defined (__need_wchar_t) || defined (_STDDEF_H_)
+#undef _WCHAR_T_
+#undef _BSD_WCHAR_T_
+#endif
+#endif /* defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_) || defined(_X86_64_ANSI_H_) || defined(_I386_ANSI_H_) */
+
+/* Sequent's header files use _PTRDIFF_T_ in some conflicting way.
+   Just ignore it.  */
+#if defined (__sequent__) && defined (_PTRDIFF_T_)
+#undef _PTRDIFF_T_
+#endif
+
+/* On VxWorks, <type/vxTypesBase.h> may have defined macros like
+   _TYPE_size_t which will typedef size_t.  fixincludes patched the
+   vxTypesBase.h so that this macro is only defined if _GCC_SIZE_T is
+   not defined, and so that defining this macro defines _GCC_SIZE_T.
+   If we find that the macros are still defined at this point, we must
+   invoke them so that the type is defined as expected.  */
+#if defined (_TYPE_ptrdiff_t) && (defined (__need_ptrdiff_t) || defined (_STDDEF_H_))
+_TYPE_ptrdiff_t;
+#undef _TYPE_ptrdiff_t
+#endif
+#if defined (_TYPE_size_t) && (defined (__need_size_t) || defined (_STDDEF_H_))
+_TYPE_size_t;
+#undef _TYPE_size_t
+#endif
+#if defined (_TYPE_wchar_t) && (defined (__need_wchar_t) || defined (_STDDEF_H_))
+_TYPE_wchar_t;
+#undef _TYPE_wchar_t
+#endif
+
+/* In case nobody has defined these types, but we aren't running under
+   GCC 2.00, make sure that __PTRDIFF_TYPE__, __SIZE_TYPE__, and
+   __WCHAR_TYPE__ have reasonable values.  This can happen if the
+   parts of GCC is compiled by an older compiler, that actually
+   include gstddef.h, such as collect2.  */
+
+/* Signed type of difference of two pointers.  */
+
+/* Define this type if we are doing the whole job,
+   or if we want this type in particular.  */
+#if defined (_STDDEF_H) || defined (__need_ptrdiff_t)
+#ifndef _PTRDIFF_T	/* in case <sys/types.h> has defined it. */
+#ifndef _T_PTRDIFF_
+#ifndef _T_PTRDIFF
+#ifndef __PTRDIFF_T
+#ifndef _PTRDIFF_T_
+#ifndef _BSD_PTRDIFF_T_
+#ifndef ___int_ptrdiff_t_h
+#ifndef _GCC_PTRDIFF_T
+#ifndef _PTRDIFF_T_DECLARED /* DragonFly */
+#define _PTRDIFF_T
+#define _T_PTRDIFF_
+#define _T_PTRDIFF
+#define __PTRDIFF_T
+#define _PTRDIFF_T_
+#define _BSD_PTRDIFF_T_
+#define ___int_ptrdiff_t_h
+#define _GCC_PTRDIFF_T
+#define _PTRDIFF_T_DECLARED
+#ifndef __PTRDIFF_TYPE__
+#define __PTRDIFF_TYPE__ long int
+#endif
+typedef __PTRDIFF_TYPE__ ptrdiff_t;
+#endif /* _PTRDIFF_T_DECLARED */
+#endif /* _GCC_PTRDIFF_T */
+#endif /* ___int_ptrdiff_t_h */
+#endif /* _BSD_PTRDIFF_T_ */
+#endif /* _PTRDIFF_T_ */
+#endif /* __PTRDIFF_T */
+#endif /* _T_PTRDIFF */
+#endif /* _T_PTRDIFF_ */
+#endif /* _PTRDIFF_T */
+
+/* If this symbol has done its job, get rid of it.  */
+#undef	__need_ptrdiff_t
+
+#endif /* _STDDEF_H or __need_ptrdiff_t.  */
+
+/* Unsigned type of `sizeof' something.  */
+
+/* Define this type if we are doing the whole job,
+   or if we want this type in particular.  */
+#if defined (_STDDEF_H) || defined (__need_size_t)
+#ifndef __size_t__	/* BeOS */
+#ifndef __SIZE_T__	/* Cray Unicos/Mk */
+#ifndef _SIZE_T	/* in case <sys/types.h> has defined it. */
+#ifndef _SYS_SIZE_T_H
+#ifndef _T_SIZE_
+#ifndef _T_SIZE
+#ifndef __SIZE_T
+#ifndef _SIZE_T_
+#ifndef _BSD_SIZE_T_
+#ifndef _SIZE_T_DEFINED_
+#ifndef _SIZE_T_DEFINED
+#ifndef _BSD_SIZE_T_DEFINED_	/* Darwin */
+#ifndef _SIZE_T_DECLARED	/* FreeBSD 5 */
+#ifndef ___int_size_t_h
+#ifndef _GCC_SIZE_T
+#ifndef _SIZET_
+#ifndef __size_t
+#define __size_t__	/* BeOS */
+#define __SIZE_T__	/* Cray Unicos/Mk */
+#define _SIZE_T
+#define _SYS_SIZE_T_H
+#define _T_SIZE_
+#define _T_SIZE
+#define __SIZE_T
+#define _SIZE_T_
+#define _BSD_SIZE_T_
+#define _SIZE_T_DEFINED_
+#define _SIZE_T_DEFINED
+#define _BSD_SIZE_T_DEFINED_	/* Darwin */
+#define _SIZE_T_DECLARED	/* FreeBSD 5 */
+#define ___int_size_t_h
+#define _GCC_SIZE_T
+#define _SIZET_
+#if (defined (__FreeBSD__) && (__FreeBSD__ >= 5)) \
+  || defined(__DragonFly__) \
+  || defined(__FreeBSD_kernel__)
+/* __size_t is a typedef on FreeBSD 5, must not trash it. */
+#elif defined (__VMS__)
+/* __size_t is also a typedef on VMS.  */
+#else
+#define __size_t
+#endif
+#ifndef __SIZE_TYPE__
+#define __SIZE_TYPE__ long unsigned int
+#endif
+#if !(defined (__GNUG__) && defined (size_t))
+typedef __SIZE_TYPE__ size_t;
+#ifdef __BEOS__
+typedef long ssize_t;
+#endif /* __BEOS__ */
+#endif /* !(defined (__GNUG__) && defined (size_t)) */
+#endif /* __size_t */
+#endif /* _SIZET_ */
+#endif /* _GCC_SIZE_T */
+#endif /* ___int_size_t_h */
+#endif /* _SIZE_T_DECLARED */
+#endif /* _BSD_SIZE_T_DEFINED_ */
+#endif /* _SIZE_T_DEFINED */
+#endif /* _SIZE_T_DEFINED_ */
+#endif /* _BSD_SIZE_T_ */
+#endif /* _SIZE_T_ */
+#endif /* __SIZE_T */
+#endif /* _T_SIZE */
+#endif /* _T_SIZE_ */
+#endif /* _SYS_SIZE_T_H */
+#endif /* _SIZE_T */
+#endif /* __SIZE_T__ */
+#endif /* __size_t__ */
+#undef	__need_size_t
+#endif /* _STDDEF_H or __need_size_t.  */
+
+
+/* Wide character type.
+   Locale-writers should change this as necessary to
+   be big enough to hold unique values not between 0 and 127,
+   and not (wchar_t) -1, for each defined multibyte character.  */
+
+/* Define this type if we are doing the whole job,
+   or if we want this type in particular.  */
+#if defined (_STDDEF_H) || defined (__need_wchar_t)
+#ifndef __wchar_t__	/* BeOS */
+#ifndef __WCHAR_T__	/* Cray Unicos/Mk */
+#ifndef _WCHAR_T
+#ifndef _T_WCHAR_
+#ifndef _T_WCHAR
+#ifndef __WCHAR_T
+#ifndef _WCHAR_T_
+#ifndef _BSD_WCHAR_T_
+#ifndef _BSD_WCHAR_T_DEFINED_    /* Darwin */
+#ifndef _BSD_RUNE_T_DEFINED_	/* Darwin */
+#ifndef _WCHAR_T_DECLARED /* FreeBSD 5 */
+#ifndef _WCHAR_T_DEFINED_
+#ifndef _WCHAR_T_DEFINED
+#ifndef _WCHAR_T_H
+#ifndef ___int_wchar_t_h
+#ifndef __INT_WCHAR_T_H
+#ifndef _GCC_WCHAR_T
+#define __wchar_t__	/* BeOS */
+#define __WCHAR_T__	/* Cray Unicos/Mk */
+#define _WCHAR_T
+#define _T_WCHAR_
+#define _T_WCHAR
+#define __WCHAR_T
+#define _WCHAR_T_
+#define _BSD_WCHAR_T_
+#define _WCHAR_T_DEFINED_
+#define _WCHAR_T_DEFINED
+#define _WCHAR_T_H
+#define ___int_wchar_t_h
+#define __INT_WCHAR_T_H
+#define _GCC_WCHAR_T
+#define _WCHAR_T_DECLARED
+
+/* On BSD/386 1.1, at least, machine/ansi.h defines _BSD_WCHAR_T_
+   instead of _WCHAR_T_, and _BSD_RUNE_T_ (which, unlike the other
+   symbols in the _FOO_T_ family, stays defined even after its
+   corresponding type is defined).  If we define wchar_t, then we
+   must undef _WCHAR_T_; for BSD/386 1.1 (and perhaps others), if
+   we undef _WCHAR_T_, then we must also define rune_t, since 
+   headers like runetype.h assume that if machine/ansi.h is included,
+   and _BSD_WCHAR_T_ is not defined, then rune_t is available.
+   machine/ansi.h says, "Note that _WCHAR_T_ and _RUNE_T_ must be of
+   the same type." */
+#ifdef _BSD_WCHAR_T_
+#undef _BSD_WCHAR_T_
+#ifdef _BSD_RUNE_T_
+#if !defined (_ANSI_SOURCE) && !defined (_POSIX_SOURCE)
+typedef _BSD_RUNE_T_ rune_t;
+#define _BSD_WCHAR_T_DEFINED_
+#define _BSD_RUNE_T_DEFINED_	/* Darwin */
+#if defined (__FreeBSD__) && (__FreeBSD__ < 5)
+/* Why is this file so hard to maintain properly?  In contrast to
+   the comment above regarding BSD/386 1.1, on FreeBSD for as long
+   as the symbol has existed, _BSD_RUNE_T_ must not stay defined or
+   redundant typedefs will occur when stdlib.h is included after this file. */
+#undef _BSD_RUNE_T_
+#endif
+#endif
+#endif
+#endif
+/* FreeBSD 5 can't be handled well using "traditional" logic above
+   since it no longer defines _BSD_RUNE_T_ yet still desires to export
+   rune_t in some cases... */
+#if defined (__FreeBSD__) && (__FreeBSD__ >= 5)
+#if !defined (_ANSI_SOURCE) && !defined (_POSIX_SOURCE)
+#if __BSD_VISIBLE
+#ifndef _RUNE_T_DECLARED
+typedef __rune_t        rune_t;
+#define _RUNE_T_DECLARED
+#endif
+#endif
+#endif
+#endif
+
+#ifndef __WCHAR_TYPE__
+#define __WCHAR_TYPE__ int
+#endif
+#ifndef __cplusplus
+typedef __WCHAR_TYPE__ wchar_t;
+#endif
+#endif
+#endif
+#endif
+#endif
+#endif
+#endif
+#endif /* _WCHAR_T_DECLARED */
+#endif /* _BSD_RUNE_T_DEFINED_ */
+#endif
+#endif
+#endif
+#endif
+#endif
+#endif
+#endif
+#endif /* __WCHAR_T__ */
+#endif /* __wchar_t__ */
+#undef	__need_wchar_t
+#endif /* _STDDEF_H or __need_wchar_t.  */
+
+#if defined (__need_wint_t)
+#ifndef _WINT_T
+#define _WINT_T
+
+#ifndef __WINT_TYPE__
+#define __WINT_TYPE__ unsigned int
+#endif
+typedef __WINT_TYPE__ wint_t;
+#endif
+#undef __need_wint_t
+#endif
+
+/*  In 4.3bsd-net2, leave these undefined to indicate that size_t, etc.
+    are already defined.  */
+/*  BSD/OS 3.1 and FreeBSD [23].x require the MACHINE_ANSI_H check here.  */
+/*  NetBSD 5 requires the I386_ANSI_H and X86_64_ANSI_H checks here.  */
+#if defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_) || defined(_X86_64_ANSI_H_) || defined(_I386_ANSI_H_)
+/*  The references to _GCC_PTRDIFF_T_, _GCC_SIZE_T_, and _GCC_WCHAR_T_
+    are probably typos and should be removed before 2.8 is released.  */
+#ifdef _GCC_PTRDIFF_T_
+#undef _PTRDIFF_T_
+#undef _BSD_PTRDIFF_T_
+#endif
+#ifdef _GCC_SIZE_T_
+#undef _SIZE_T_
+#undef _BSD_SIZE_T_
+#endif
+#ifdef _GCC_WCHAR_T_
+#undef _WCHAR_T_
+#undef _BSD_WCHAR_T_
+#endif
+/*  The following ones are the real ones.  */
+#ifdef _GCC_PTRDIFF_T
+#undef _PTRDIFF_T_
+#undef _BSD_PTRDIFF_T_
+#endif
+#ifdef _GCC_SIZE_T
+#undef _SIZE_T_
+#undef _BSD_SIZE_T_
+#endif
+#ifdef _GCC_WCHAR_T
+#undef _WCHAR_T_
+#undef _BSD_WCHAR_T_
+#endif
+#endif /* _ANSI_H_ || _MACHINE_ANSI_H_ || _X86_64_ANSI_H_ || _I386_ANSI_H_ */
+
+#endif /* __sys_stdtypes_h */
+
+/* A null pointer constant.  */
+
+#if defined (_STDDEF_H) || defined (__need_NULL)
+#undef NULL		/* in case <stdio.h> has defined it. */
+#ifdef __GNUG__
+#define NULL __null
+#else   /* G++ */
+#ifndef __cplusplus
+#define NULL ((void *)0)
+#else   /* C++ */
+#define NULL 0
+#endif  /* C++ */
+#endif  /* G++ */
+#endif	/* NULL not defined and <stddef.h> or need NULL.  */
+#undef	__need_NULL
+
+#ifdef _STDDEF_H
+
+/* Offset of member MEMBER in a struct of type TYPE. */
+#define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)
+
+#if (defined (__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) \
+  || (defined(__cplusplus) && __cplusplus >= 201103L)
+#ifndef _GCC_MAX_ALIGN_T
+#define _GCC_MAX_ALIGN_T
+/* Type whose alignment is supported in every context and is at least
+   as great as that of any standard type not using alignment
+   specifiers.  */
+typedef struct {
+  long long __max_align_ll __attribute__((__aligned__(__alignof__(long long))));
+  long double __max_align_ld __attribute__((__aligned__(__alignof__(long double))));
+  /* _Float128 is defined as a basic type, so max_align_t must be
+     sufficiently aligned for it.  This code must work in C++, so we
+     use __float128 here; that is only available on some
+     architectures, but only on i386 is extra alignment needed for
+     __float128.  */
+#ifdef __i386__
+  __float128 __max_align_f128 __attribute__((__aligned__(__alignof(__float128))));
+#endif
+} max_align_t;
+#endif
+#endif /* C11 or C++11.  */
+
+#if defined(__cplusplus) && __cplusplus >= 201103L
+#ifndef _GXX_NULLPTR_T
+#define _GXX_NULLPTR_T
+  typedef decltype(nullptr) nullptr_t;
+#endif
+#endif /* C++11.  */
+
+#endif /* _STDDEF_H was defined this time */
+
+#endif /* !_STDDEF_H && !_STDDEF_H_ && !_ANSI_STDDEF_H && !__STDDEF_H__
+	  || __need_XXX was not defined before */
diff --git a/src/libc/include/stdint.h b/src/libc/include/stdint.h
new file mode 100644
index 0000000..ba8419a
--- /dev/null
+++ b/src/libc/include/stdint.h
@@ -0,0 +1,33 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef _STDINT_H
+#define _STDINT_H
+
+typedef unsigned char uint8_t, uint_least8_t;
+typedef signed char int8_t, int_least8_t;
+typedef unsigned short uint16_t, uint_least16_t;
+typedef short int16_t, int_least16_t;
+typedef unsigned uintptr_t, uint32_t, uint_least32_t, uint_fast8_t,
+    uint_fast16_t, uint_fast32_t;
+typedef int intptr_t, int32_t, int_least32_t, int_fast8_t, int_fast16_t,
+    int_fast32_t;
+typedef unsigned long long uint64_t, uint_least64_t, uint_fast64_t, uintmax_t;
+typedef long long int64_t, int_least64_t, int_fast64_t, intmax_t;
+
+#endif
diff --git a/src/libc/include/stdio.h b/src/libc/include/stdio.h
index 1d0e27c..b9c1a38 100644
--- a/src/libc/include/stdio.h
+++ b/src/libc/include/stdio.h
@@ -1,5 +1,5 @@
 /*
- * wanix, a Unix-like operating system for WebAssembly
+ * wnix, a Unix-like operating system for WebAssembly applications.
  * Copyright (C) 2025  Xavier Del Campo Romero
  *
  * This program is free software: you can redistribute it and/or modify
@@ -19,17 +19,11 @@
 #ifndef _STDIO_H
 #define _STDIO_H
 
-enum
-{
-    EOF = -1
-};
+enum {EOF = -1};
 
-typedef struct __file FILE;
+int puts(const char *__s);
+int putchar(int __c);
 
-FILE *fopen(const char *__path, const char *__mode);
-int printf(const char *__fmt, ...);
-int fprintf(FILE *__stream, const char *__fmt, ...);
-
-extern FILE *stdin, *stdout, *stderr;
+#include <printf.h>
 
 #endif
diff --git a/src/libc/include/stdlib.h b/src/libc/include/stdlib.h
index 4065f1c..8f97ea3 100644
--- a/src/libc/include/stdlib.h
+++ b/src/libc/include/stdlib.h
@@ -1,5 +1,5 @@
 /*
- * wanix, a Unix-like operating system for WebAssembly
+ * wnix, a Unix-like operating system for WebAssembly applications.
  * Copyright (C) 2025  Xavier Del Campo Romero
  *
  * This program is free software: you can redistribute it and/or modify
@@ -24,8 +24,25 @@
 #define EXIT_SUCCESS 0
 #define EXIT_FAILURE 1
 
+#define abort() __abort(__FILE__, __LINE__)
+
+typedef struct
+{
+    int quot, rem;
+} div_t;
+
+int abs(int __v);
+long labs(long __v);
+long long llabs(long long __v);
 void *malloc(size_t __n);
 void *calloc(size_t __nemb, size_t __size);
+void *realloc(void *__ptr, size_t __size);
 void free(void *__p);
+long strtol(const char *__s, char **__end, int __base);
+long long strtoll(const char *__s, char **__end, int __base);
+unsigned long strtoul(const char *__s, char **__end, int __base);
+unsigned long long strtoull(const char *__s, char **__end, int __base);
+void __abort(const char *__file, int __lineno);
+div_t div(int __numerator, int __denominator);
 
 #endif
diff --git a/src/libc/include/string.h b/src/libc/include/string.h
index 20c9cf3..1e62a84 100644
--- a/src/libc/include/string.h
+++ b/src/libc/include/string.h
@@ -1,3 +1,21 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 #ifndef _STRING_H
 #define _STRING_H
 
@@ -6,8 +24,17 @@
 int memcmp(const void *__s1, const void *__s2, size_t __n);
 void *memcpy(void *__dst, const void *__src, size_t __n);
 void *memset(void *__dst, int __c, size_t __n);
+int strcasecmp(const char *__a, const char *__b);
 char *strchr(const char *__s, int __n);
-char *strerror(int errnum);
+int strcmp(const char *__a, const char *__b);
+char *strdup(const char *__s);
+char *strerror(int __errnum);
+int strncmp(const char *__a, const char *__b, size_t __n);
+char *strndup(const char *__s, size_t __n);
+char *strpbrk(const char *const __s, const char *__accept);
 size_t strlen(const char *__s);
+char *strrchr(const char *__s, int __c);
+size_t strspn(const char *__s, const char *__accept);
+size_t strcspn(const char *__s, const char * __reject);
 
 #endif
diff --git a/src/libc/include/sys/mount.h b/src/libc/include/sys/mount.h
new file mode 100644
index 0000000..eae6d63
--- /dev/null
+++ b/src/libc/include/sys/mount.h
@@ -0,0 +1,25 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SYS_MOUNT_H
+#define _SYS_MOUNT_H
+
+int mount(const char *__src, const char *__tgt, const char *__type,
+    unsigned long __flags, const void *__args);
+
+#endif
diff --git a/src/libc/include/sys/stat.h b/src/libc/include/sys/stat.h
new file mode 100644
index 0000000..08fcf9a
--- /dev/null
+++ b/src/libc/include/sys/stat.h
@@ -0,0 +1,42 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SYS_STAT_H
+#define _SYS_STAT_H
+
+#include <sys/types.h>
+#include <time.h>
+
+struct stat
+{
+    dev_t st_dev;
+    ino_t st_ino;
+    mode_t st_mode;
+    nlink_t st_nlink;
+    uid_t st_uid;
+    gid_t st_gid;
+    dev_t st_rdev;
+    off_t st_size;
+    struct timespec st_atim, st_mtim, st_ctim;
+    blksize_t st_blksize;
+    blkcnt_t st_blocks;
+};
+
+int mkdir(const char *pathname, mode_t flags);
+
+#endif
diff --git a/src/libc/include/sys/types.h b/src/libc/include/sys/types.h
new file mode 100644
index 0000000..86ca604
--- /dev/null
+++ b/src/libc/include/sys/types.h
@@ -0,0 +1,26 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SYS_TYPES_H
+#define _SYS_TYPES_H
+
+typedef unsigned dev_t, mode_t, nlink_t, uid_t, gid_t, blksize_t, blkcnt_t;
+typedef unsigned long ino_t, off_t;
+typedef int pid_t;
+
+#endif
diff --git a/src/libc/include/time.h b/src/libc/include/time.h
new file mode 100644
index 0000000..3b78d22
--- /dev/null
+++ b/src/libc/include/time.h
@@ -0,0 +1,46 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef _TIME_H
+#define _TIME_H
+
+typedef enum
+{
+    CLOCK_REALTIME
+} clockid_t;
+
+typedef long long time_t;
+
+struct timespec
+{
+    time_t tv_sec;
+    long tv_nsec;
+};
+
+struct tm
+{
+    int tm_sec, tm_min, tm_hour, tm_mday, tm_mon, tm_year, tm_wday, tm_yday,
+        tm_isdst;
+};
+
+int clock_getres(clockid_t __id, struct timespec *__ts);
+int clock_gettime(clockid_t __id, struct timespec *__ts);
+int clock_settime(clockid_t __id, const struct timespec *__ts);
+time_t mktime(struct tm *__tm);
+
+#endif
diff --git a/src/libc/include/unistd.h b/src/libc/include/unistd.h
new file mode 100644
index 0000000..ec4fc13
--- /dev/null
+++ b/src/libc/include/unistd.h
@@ -0,0 +1,26 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef _UNISTD_H
+#define _UNISTD_H
+
+#include <stdint.h>
+
+void *sbrk(intptr_t increment);
+
+#endif