lib: Add mlibc

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 1227 insertions, 0 deletions

diff --git a/lib/mlibc/options/posix/generic/unistd-stubs.cpp b/lib/mlibc/options/posix/generic/unistd-stubs.cpp
new file mode 100644
index 0000000..39cf76a
--- /dev/null
+++ b/lib/mlibc/options/posix/generic/unistd-stubs.cpp
@@ -0,0 +1,1227 @@
+#include <stdio.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/resource.h>
+#include <unistd.h>
+#include <limits.h>
+#include <termios.h>
+#include <pwd.h>
+#include <sys/ioctl.h>
+
+#include <bits/ensure.h>
+#include <mlibc/allocator.hpp>
+#include <mlibc/arch-defs.hpp>
+#include <mlibc/debug.hpp>
+#include <mlibc/posix-sysdeps.hpp>
+#include <mlibc/bsd-sysdeps.hpp>
+#include <mlibc/thread.hpp>
+
+namespace {
+
+constexpr bool logExecvpeTries = false;
+
+}
+
+unsigned int alarm(unsigned int seconds) {
+	struct itimerval it = {}, old = {};
+	it.it_value.tv_sec = seconds;
+	setitimer(ITIMER_REAL, &it, &old);
+	return old.it_value.tv_sec + !! old.it_value.tv_usec;
+}
+
+int chdir(const char *path) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_chdir, -1);
+	if(int e = mlibc::sys_chdir(path); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int fchdir(int fd) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_fchdir, -1);
+	if(int e = mlibc::sys_fchdir(fd); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int chown(const char *path, uid_t uid, gid_t gid) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_fchownat, -1);
+	if(int e = mlibc::sys_fchownat(AT_FDCWD, path, uid, gid, 0); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+ssize_t confstr(int name, char *buf, size_t len) {
+	const char *str = "";
+	if (name == _CS_PATH) {
+		str = "/bin:/usr/bin";
+	} else if(name == _CS_GNU_LIBPTHREAD_VERSION) {
+		// We are not glibc, so we can return 0 here.
+		return 0;
+	} else if(name == _CS_GNU_LIBC_VERSION) {
+		// We are not glibc, so we can return 0 here.
+		return 0;
+	} else {
+		mlibc::infoLogger() << "\e[31mmlibc: confstr() request " << name << " is unimplemented\e[39m"
+				<< frg::endlog;
+		__ensure(!"Not implemented");
+	}
+
+	return snprintf(buf, len, "%s", str) + 1;
+}
+
+void _exit(int status) {
+	mlibc::sys_exit(status);
+}
+
+int execl(const char *path, const char *arg0, ...) {
+	// TODO: It's a stupid idea to limit the number of arguments here.
+	char *argv[16];
+	argv[0] = const_cast<char *>(arg0);
+
+	va_list args;
+	int n = 1;
+	va_start(args, arg0);
+	while(true) {
+		__ensure(n < 15);
+		auto argn = va_arg(args, const char *);
+		argv[n++] = const_cast<char *>(argn);
+		if(!argn)
+			break;
+	}
+	va_end(args);
+	argv[n] = nullptr;
+
+	return execve(path, argv, environ);
+}
+
+// This function is taken from musl.
+int execle(const char *path, const char *arg0, ...) {
+	int argc;
+	va_list ap;
+	va_start(ap, arg0);
+	for(argc = 1; va_arg(ap, const char *); argc++);
+	va_end(ap);
+
+	int i;
+	char *argv[argc + 1];
+	char **envp;
+	va_start(ap, arg0);
+	argv[0] = (char *)argv;
+	for(i = 1; i <= argc; i++)
+		argv[i] = va_arg(ap, char *);
+	envp = va_arg(ap, char **);
+	va_end(ap);
+	return execve(path, argv, envp);
+}
+
+// This function is taken from musl
+int execlp(const char *file, const char *argv0, ...) {
+	int argc;
+	va_list ap;
+	va_start(ap, argv0);
+	for(argc = 1; va_arg(ap, const char *); argc++);
+	va_end(ap);
+	{
+		int i;
+		char *argv[argc + 1];
+		va_start(ap, argv0);
+		argv[0] = (char *)argv0;
+		for(i = 1; i < argc; i++)
+			argv[i] = va_arg(ap, char *);
+		argv[i] = NULL;
+		va_end(ap);
+		return execvp(file, argv);
+	}
+}
+
+int execv(const char *path, char *const argv[]) {
+	return execve(path, argv, environ);
+}
+
+int execvp(const char *file, char *const argv[]) {
+	return execvpe(file, argv, environ);
+}
+
+int execvpe(const char *file, char *const argv[], char *const envp[]) {
+	char *null_list[] = {
+		nullptr
+	};
+
+	if(!argv)
+		argv = null_list;
+	if(!envp)
+		envp = null_list;
+
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_execve, -1);
+
+	if(strchr(file, '/')) {
+		int e = mlibc::sys_execve(file, argv, envp);
+		__ensure(e && "sys_execve() is supposed to never return with success");
+		errno = e;
+		return -1;
+	}
+
+	frg::string_view dirs;
+	if(const char *pv = getenv("PATH"); pv) {
+		dirs = pv;
+	}else{
+		dirs = "/bin:/usr/bin";
+	}
+
+	size_t p = 0;
+	int res = ENOENT;
+	while(p < dirs.size()) {
+		size_t s; // Offset of next colon or end of string.
+		if(size_t cs = dirs.find_first(':', p); cs != size_t(-1)) {
+			s = cs;
+		}else{
+			s = dirs.size();
+		}
+
+		frg::string<MemoryAllocator> path{getAllocator()};
+		path += dirs.sub_string(p, s - p);
+		path += "/";
+		path += file;
+
+		if(logExecvpeTries)
+			mlibc::infoLogger() << "mlibc: execvpe() tries '" << path.data() << "'" << frg::endlog;
+
+		int e = mlibc::sys_execve(path.data(), argv, envp);
+		__ensure(e && "sys_execve() is supposed to never return with success");
+		switch(e) {
+		case ENOENT:
+		case ENOTDIR:
+			break;
+		case EACCES:
+			res = EACCES;
+			break;
+		default:
+			errno = e;
+			return -1;
+		}
+
+		p = s + 1;
+	}
+
+	errno = res;
+	return -1;
+}
+
+int faccessat(int dirfd, const char *pathname, int mode, int flags) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_faccessat, -1);
+	if(int e = mlibc::sys_faccessat(dirfd, pathname, mode, flags); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int fchown(int fd, uid_t uid, gid_t gid) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_fchownat, -1);
+	if(int e = mlibc::sys_fchownat(fd, "", uid, gid, AT_EMPTY_PATH); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int fchownat(int fd, const char *path, uid_t uid, gid_t gid, int flags) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_fchownat, -1);
+	if(int e = mlibc::sys_fchownat(fd, path, uid, gid, flags); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int fdatasync(int fd) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_fdatasync, -1);
+	if(int e = mlibc::sys_fdatasync(fd); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int fexecve(int, char *const [], char *const []) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+long fpathconf(int, int) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+int fsync(int fd) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_fsync, -1);
+	if(auto e = mlibc::sys_fsync(fd); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int ftruncate(int fd, off_t size) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_ftruncate, -1);
+	if(int e = mlibc::sys_ftruncate(fd, size); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+char *getcwd(char *buffer, size_t size) {
+	if (buffer) {
+		if (size == 0) {
+			errno = EINVAL;
+			return NULL;
+		}
+	} else if (!buffer) {
+		if (size == 0)
+			size = PATH_MAX;
+
+		buffer = (char *)malloc(size);
+	}
+
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_getcwd, nullptr);
+	if(int e = mlibc::sys_getcwd(buffer, size); e) {
+		errno = e;
+		return NULL;
+	}
+
+	return buffer;
+}
+
+int getgroups(int size, gid_t list[]) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_getgroups, -1);
+	int ret;
+	if(int e = mlibc::sys_getgroups(size, list, &ret); e) {
+		errno = e;
+		return -1;
+	}
+	return ret;
+}
+
+long gethostid(void) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+int gethostname(char *buffer, size_t bufsize) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_gethostname, -1);
+	if(auto e = mlibc::sys_gethostname(buffer, bufsize); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int sethostname(const char *buffer, size_t bufsize) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_sethostname, -1);
+	if(auto e = mlibc::sys_sethostname(buffer, bufsize); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+// Code taken from musl
+char *getlogin(void) {
+	return getenv("LOGNAME");
+}
+
+int getlogin_r(char *, size_t) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+// optarg and optind are provided to us by the GLIBC part of the mlibc.
+
+static char *scan = NULL; /* Private scan pointer. */
+
+int getopt(int argc, char *const argv[], const char *optstring) {
+	char c;
+	char *place;
+
+	optarg = NULL;
+
+	if (!scan || *scan == '\0') {
+		if (optind == 0)
+			optind++;
+
+		if (optind >= argc || argv[optind][0] != '-' || argv[optind][1] == '\0')
+			return EOF;
+		if (argv[optind][1] == '-' && argv[optind][2] == '\0') {
+			optind++;
+			return EOF;
+		}
+
+		scan = argv[optind]+1;
+		optind++;
+	}
+
+	c = *scan++;
+	place = strchr(optstring, c);
+
+	if (!place || c == ':') {
+		fprintf(stderr, "%s: unknown option -%c\n", argv[0], c);
+		return '?';
+	}
+
+	place++;
+	if (*place == ':') {
+		if (*scan != '\0') {
+			optarg = scan;
+			scan = NULL;
+		} else if( optind < argc ) {
+			optarg = argv[optind];
+			optind++;
+		} else {
+			fprintf(stderr, "%s: option requires argument -%c\n", argv[0], c);
+			return ':';
+		}
+	}
+
+	return c;
+}
+
+pid_t getpgid(pid_t pid) {
+	pid_t pgid;
+
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_getpgid, -1);
+	if(int e = mlibc::sys_getpgid(pid, &pgid); e) {
+		errno = e;
+		return -1;
+	}
+	return pgid;
+}
+
+pid_t getpgrp(void) {
+	return getpgid(0);
+}
+
+pid_t getsid(pid_t pid) {
+	if(!mlibc::sys_getsid) {
+		MLIBC_MISSING_SYSDEP();
+		return -1;
+	}
+	pid_t sid;
+	if(int e = mlibc::sys_getsid(pid, &sid); e) {
+		errno = e;
+		return -1;
+	}
+	return sid;
+}
+
+int lchown(const char *path, uid_t uid, gid_t gid) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_fchownat, -1);
+	if(int e = mlibc::sys_fchownat(AT_FDCWD, path, uid, gid, AT_SYMLINK_NOFOLLOW); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int link(const char *old_path, const char *new_path) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_link, -1);
+	if(int e = mlibc::sys_link(old_path, new_path); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int linkat(int olddirfd, const char *old_path, int newdirfd, const char *new_path, int flags) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_linkat, -1);
+	if(int e = mlibc::sys_linkat(olddirfd, old_path, newdirfd, new_path, flags); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+// Code take from musl
+int lockf(int fd, int op, off_t size) {
+	struct flock l = {
+		.l_type = F_WRLCK,
+		.l_whence = SEEK_CUR,
+		.l_start = 0,
+		.l_len = size,
+		.l_pid = 0,
+	};
+
+	switch(op) {
+		case F_TEST:
+			l.l_type = F_RDLCK;
+			if(fcntl(fd, F_GETLK, &l) < 0)
+				return -1;
+			if(l.l_type == F_UNLCK || l.l_pid == getpid())
+				return 0;
+			errno = EACCES;
+			return -1;
+		case F_ULOCK:
+			l.l_type = F_UNLCK;
+			[[fallthrough]];
+		case F_TLOCK:
+			return fcntl(fd, F_SETLK, &l);
+		case F_LOCK:
+			return fcntl(fd, F_SETLKW, &l);
+	}
+
+	errno = EINVAL;
+	return -1;
+}
+
+int nice(int) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+long pathconf(const char *, int name) {
+	switch (name) {
+	case _PC_NAME_MAX:
+		return NAME_MAX;
+	default:
+		mlibc::infoLogger() << "missing pathconf() entry " << name << frg::endlog;
+		errno = EINVAL;
+		return -1;
+	}
+}
+
+int pause(void) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_pause, -1);
+	if(int e = mlibc::sys_pause(); e) {
+		errno = e;
+		return -1;
+	}
+	__ensure(!"There is no successful completion return value for pause");
+	__builtin_unreachable();
+}
+
+int pipe(int *fds) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_pipe, -1);
+	if(int e = mlibc::sys_pipe(fds, 0); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int pipe2(int *fds, int flags) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_pipe, -1);
+	if(int e = mlibc::sys_pipe(fds, flags); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+ssize_t pread(int fd, void *buf, size_t n, off_t off) {
+	ssize_t num_read;
+
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_pread, -1);
+	if(int e = mlibc::sys_pread(fd, buf, n, off, &num_read); e) {
+		errno = e;
+		return -1;
+	}
+	return num_read;
+}
+
+ssize_t pwrite(int fd, const void *buf, size_t n, off_t off) {
+	ssize_t num_written;
+
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_pwrite, -1);
+	if(int e = mlibc::sys_pwrite(fd, buf, n, off, &num_written); e) {
+		errno = e;
+		return -1;
+	}
+	return num_written;
+}
+
+ssize_t readlink(const char *__restrict path, char *__restrict buffer, size_t max_size) {
+	ssize_t length;
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_readlink, -1);
+	if(int e = mlibc::sys_readlink(path, buffer, max_size, &length); e) {
+		errno = e;
+		return -1;
+	}
+	return length;
+}
+
+ssize_t readlinkat(int, const char *__restrict, char *__restrict, size_t) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+int rmdir(const char *path) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_rmdir, -1);
+	if(int e = mlibc::sys_rmdir(path); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int setegid(gid_t egid) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_setegid, 0);
+	if(int e = mlibc::sys_setegid(egid); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int seteuid(uid_t euid) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_seteuid, 0);
+	if(int e = mlibc::sys_seteuid(euid); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int setgid(gid_t gid) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_setgid, 0);
+	if(int e = mlibc::sys_setgid(gid); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int setpgid(pid_t pid, pid_t pgid) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_setpgid, -1);
+	if(int e = mlibc::sys_setpgid(pid, pgid); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+pid_t setpgrp(void) {
+	return setpgid(0, 0);
+}
+
+int setregid(gid_t rgid, gid_t egid) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_setregid, -1);
+	if(int e = mlibc::sys_setregid(rgid, egid); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int setreuid(uid_t ruid, uid_t euid) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_setreuid, -1);
+	if(int e = mlibc::sys_setreuid(ruid, euid); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+pid_t setsid(void) {
+	if(!mlibc::sys_setsid) {
+		MLIBC_MISSING_SYSDEP();
+		return -1;
+	}
+	pid_t sid;
+	if(int e = mlibc::sys_setsid(&sid); e) {
+		errno = e;
+		return -1;
+	}
+	return sid;
+}
+
+int setuid(uid_t uid) {
+	if(!mlibc::sys_setuid) {
+		MLIBC_MISSING_SYSDEP();
+		mlibc::infoLogger() << "mlibc: missing sysdep sys_setuid(). Returning 0" << frg::endlog;
+		return 0;
+	}
+	if(int e = mlibc::sys_setuid(uid); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+void swab(const void *__restrict, void *__restrict, ssize_t) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+int symlink(const char *target_path, const char *link_path) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_symlink, -1);
+	if(int e = mlibc::sys_symlink(target_path, link_path); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int symlinkat(const char *target_path, int dirfd, const char *link_path) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_symlinkat, -1);
+	if(int e = mlibc::sys_symlinkat(target_path, dirfd, link_path); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+void sync(void) {
+	if(!mlibc::sys_sync) {
+		MLIBC_MISSING_SYSDEP();
+	} else {
+		mlibc::sys_sync();
+	}
+}
+
+long sysconf(int number) {
+	if(mlibc::sys_sysconf) {
+		long ret = 0;
+
+		int e = mlibc::sys_sysconf(number, &ret);
+
+		if(e && e != EINVAL) {
+			errno = e;
+			return -1;
+		}
+
+		if(e != EINVAL) {
+			return ret;
+		}
+	}
+
+	/* default return values, if not overriden by sysdep */
+	switch(number) {
+		case _SC_ARG_MAX:
+			// On linux, it is defined to 2097152 in most cases, so define it to be 2097152
+			return 2097152;
+		case _SC_PAGE_SIZE:
+			return mlibc::page_size;
+		case _SC_OPEN_MAX:
+			mlibc::infoLogger() << "\e[31mmlibc: sysconf(_SC_OPEN_MAX) returns fallback value 256\e[39m" << frg::endlog;
+			return 256;
+		case _SC_PHYS_PAGES:
+			mlibc::infoLogger() << "\e[31mmlibc: sysconf(_SC_PHYS_PAGES) returns fallback value 1024\e[39m" << frg::endlog;
+			return 1024;
+		case _SC_NPROCESSORS_ONLN:
+			mlibc::infoLogger() << "\e[31mmlibc: sysconf(_SC_NPROCESSORS_ONLN) returns fallback value 1\e[39m" << frg::endlog;
+			return 1;
+		case _SC_GETPW_R_SIZE_MAX:
+			return NSS_BUFLEN_PASSWD;
+		case _SC_GETGR_R_SIZE_MAX:
+			mlibc::infoLogger() << "\e[31mmlibc: sysconf(_SC_GETGR_R_SIZE_MAX) returns fallback value 1024\e[39m" << frg::endlog;
+			return 1024;
+		case _SC_CHILD_MAX:
+			mlibc::infoLogger() << "\e[31mmlibc: sysconf(_SC_CHILD_MAX) returns fallback value 25\e[39m" << frg::endlog;
+			// On linux, it is defined to 25 in most cases, so define it to be 25
+			return 25;
+		case _SC_JOB_CONTROL:
+			mlibc::infoLogger() << "\e[31mmlibc: sysconf(_SC_JOB_CONTROL) returns fallback value 1\e[39m" << frg::endlog;
+			// If 1, job control is supported
+			return 1;
+		case _SC_CLK_TCK:
+			// TODO: This should be obsolete?
+			mlibc::infoLogger() << "\e[31mmlibc: sysconf(_SC_CLK_TCK) is obsolete and returns arbitrary value 1000000\e[39m" << frg::endlog;
+			return 1000000;
+		case _SC_NGROUPS_MAX:
+			mlibc::infoLogger() << "\e[31mmlibc: sysconf(_SC_NGROUPS_MAX) returns fallback value 65536\e[39m" << frg::endlog;
+			// On linux, it is defined to 65536 in most cases, so define it to be 65536
+			return 65536;
+		case _SC_RE_DUP_MAX:
+			mlibc::infoLogger() << "\e[31mmlibc: sysconf(_SC_RE_DUP_MAX) returns fallback value RE_DUP_MAX\e[39m" << frg::endlog;
+			return RE_DUP_MAX;
+		case _SC_LINE_MAX:
+			mlibc::infoLogger() << "\e[31mmlibc: sysconf(_SC_LINE_MAX) returns fallback value 2048\e[39m" << frg::endlog;
+			// Linux defines it as 2048.
+			return 2048;
+		case _SC_XOPEN_CRYPT:
+#if __MLIBC_CRYPT_OPTION
+			return _XOPEN_CRYPT;
+#else
+			return -1;
+#endif /* __MLIBC_CRYPT_OPTION */
+		case _SC_NPROCESSORS_CONF:
+			// TODO: actually return a proper value for _SC_NPROCESSORS_CONF
+			mlibc::infoLogger() << "\e[31mmlibc: sysconf(_SC_NPROCESSORS_CONF) unconditionally returns fallback value 1\e[39m" << frg::endlog;
+			return 1;
+		case _SC_HOST_NAME_MAX:
+			mlibc::infoLogger() << "\e[31mmlibc: sysconf(_SC_HOST_NAME_MAX) unconditionally returns fallback value 256\e[39m" << frg::endlog;
+			return 256;
+		default:
+			mlibc::infoLogger() << "\e[31mmlibc: sysconf() call is not implemented, number: " << number << "\e[39m" << frg::endlog;
+			errno = EINVAL;
+			return -1;
+	}
+}
+
+pid_t tcgetpgrp(int fd) {
+	int pgrp;
+	if(ioctl(fd, TIOCGPGRP, &pgrp) < 0) {
+		return -1;
+	}
+	return pgrp;
+}
+
+int tcsetpgrp(int fd, pid_t pgrp) {
+	return ioctl(fd, TIOCSPGRP, &pgrp);
+}
+
+int truncate(const char *, off_t) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+char *ttyname(int fd) {
+	const size_t size = 128;
+	static thread_local char buf[size];
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_ttyname, nullptr);
+	if(int e = mlibc::sys_ttyname(fd, buf, size); e) {
+		errno = e;
+		return nullptr;
+	}
+	return buf;
+}
+
+int ttyname_r(int fd, char *buf, size_t size) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_ttyname, -1);
+	if(int e = mlibc::sys_ttyname(fd, buf, size); e) {
+		return e;
+	}
+	return 0;
+}
+
+int unlink(const char *path) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_unlinkat, -1);
+	if(int e = mlibc::sys_unlinkat(AT_FDCWD, path, 0); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int unlinkat(int fd, const char *path, int flags) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_unlinkat, -1);
+	if(int e = mlibc::sys_unlinkat(fd, path, flags); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int getpagesize() {
+	return mlibc::page_size;
+}
+
+// Code taken from musl
+// GLIBC extension for stdin/stdout
+char *getpass(const char *prompt) {
+	int fdin, fdout;
+	struct termios s, t;
+	ssize_t l;
+	static char password[128];
+
+	if((fdin = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC)) < 0) {
+		fdin = STDIN_FILENO;
+		fdout = STDOUT_FILENO;
+	} else {
+		fdout = fdin;
+	}
+
+	tcgetattr(fdin, &t);
+	s = t;
+	t.c_lflag &= ~(ECHO | ISIG);
+	t.c_lflag |= ICANON;
+	t.c_iflag &= ~(INLCR | IGNCR);
+	t.c_iflag |= ICRNL;
+	tcsetattr(fdin, TCSAFLUSH, &t);
+	tcdrain(fdin);
+
+	dprintf(fdout, "%s", prompt);
+
+	l = read(fdin, password, sizeof password);
+	if(l >= 0) {
+		if((l > 0 && password[l - 1] == '\n') || l == sizeof password)
+			l--;
+		password[l] = 0;
+	}
+
+	tcsetattr(fdin, TCSAFLUSH, &s);
+
+	dprintf(fdout, "\n");
+	if(fdin != STDIN_FILENO) {
+		close(fdin);
+	}
+
+	return l < 0 ? 0 : password;
+}
+
+char *get_current_dir_name(void) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+// This is a Linux extension
+pid_t gettid(void) {
+	if(!mlibc::sys_gettid) {
+		MLIBC_MISSING_SYSDEP();
+		__ensure(!"Cannot continue without sys_gettid()");
+	}
+	return mlibc::sys_gettid();
+}
+
+int getentropy(void *buffer, size_t length) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_getentropy, -1);
+	if(length > 256) {
+		errno = EIO;
+		return -1;
+	}
+	if(int e = mlibc::sys_getentropy(buffer, length); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+ssize_t write(int fd, const void *buf, size_t count) {
+	ssize_t bytes_written;
+	if(int e = mlibc::sys_write(fd, buf, count, &bytes_written); e) {
+		errno = e;
+		return (ssize_t)-1;
+	}
+	return bytes_written;
+}
+
+ssize_t read(int fd, void *buf, size_t count) {
+	ssize_t bytes_read;
+	if(int e = mlibc::sys_read(fd, buf, count, &bytes_read); e) {
+		errno = e;
+		return (ssize_t)-1;
+	}
+	return bytes_read;
+}
+
+off_t lseek(int fd, off_t offset, int whence) {
+	off_t new_offset;
+	if(int e = mlibc::sys_seek(fd, offset, whence, &new_offset); e) {
+		errno = e;
+		return (off_t)-1;
+	}
+	return new_offset;
+}
+
+off64_t lseek64(int fd, off64_t offset, int whence) {
+	off64_t new_offset;
+	if(int e = mlibc::sys_seek(fd, offset, whence, &new_offset); e) {
+		errno = e;
+		return (off64_t)-1;
+	}
+	return new_offset;
+}
+
+int close(int fd) {
+	return mlibc::sys_close(fd);
+}
+
+unsigned int sleep(unsigned int secs) {
+	time_t seconds = secs;
+	long nanos = 0;
+	if(!mlibc::sys_sleep) {
+		MLIBC_MISSING_SYSDEP();
+		__ensure(!"Cannot continue without sys_sleep()");
+	}
+	mlibc::sys_sleep(&seconds, &nanos);
+	return seconds;
+}
+
+// In contrast to sleep() this functions returns 0/-1 on success/failure.
+int usleep(useconds_t usecs) {
+	time_t seconds = 0;
+	long nanos = usecs * 1000;
+	if(!mlibc::sys_sleep) {
+		MLIBC_MISSING_SYSDEP();
+		__ensure(!"Cannot continue without sys_sleep()");
+	}
+	return mlibc::sys_sleep(&seconds, &nanos);
+}
+
+int dup(int fd) {
+	int newfd;
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_dup, -1);
+	if(int e = mlibc::sys_dup(fd, 0, &newfd); e) {
+		errno = e;
+		return -1;
+	}
+	return newfd;
+}
+
+int dup2(int fd, int newfd) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_dup2, -1);
+	if(int e = mlibc::sys_dup2(fd, 0, newfd); e) {
+		errno = e;
+		return -1;
+	}
+	return newfd;
+}
+
+pid_t fork(void) {
+	auto self = mlibc::get_current_tcb();
+	pid_t child;
+
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_fork, -1);
+
+	auto hand = self->atforkEnd;
+	while (hand) {
+		if (hand->prepare)
+			hand->prepare();
+
+		hand = hand->prev;
+	}
+
+	if(int e = mlibc::sys_fork(&child); e) {
+		errno = e;
+		return -1;
+	}
+
+	hand = self->atforkBegin;
+	while (hand) {
+		if (!child) {
+			if (hand->child)
+				hand->child();
+		} else {
+			if (hand->parent)
+				hand->parent();
+		}
+		hand = hand->next;
+	}
+
+	return child;
+}
+
+pid_t vfork(void) {
+	pid_t child;
+	/*
+	 * Fork handlers established using pthread_atfork(3) are not
+	 * called when a multithreaded program employing the NPTL
+	 * threading library calls vfork().  Fork handlers are called
+	 * in this case in a program using the LinuxThreads threading
+	 * library.  (See pthreads(7) for a description of Linux
+	 * threading libraries.)
+	 *  - vfork(2), release 5.13 of the Linux man-pages project
+	 *
+	 *  as a result, we call sys_fork instead of running atforks
+	 */
+
+	/* deferring to fork as implementing vfork correctly requires assembly
+	 * to handle not mucking up the stack
+	 */
+	if(!mlibc::sys_fork) {
+		MLIBC_MISSING_SYSDEP();
+		errno = ENOSYS;
+		return -1;
+	}
+
+	if(int e = mlibc::sys_fork(&child); e) {
+		errno = e;
+		return -1;
+	}
+
+	return child;
+}
+
+int execve(const char *path, char *const argv[], char *const envp[]) {
+	char *null_list[] = {
+		nullptr
+	};
+
+	if(!argv)
+		argv = null_list;
+	if(!envp)
+		envp = null_list;
+
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_execve, -1);
+	int e = mlibc::sys_execve(path, argv, envp);
+	__ensure(e && "sys_execve() is expected to fail if it returns");
+	errno = e;
+	return -1;
+}
+
+gid_t getgid(void) {
+	if(!mlibc::sys_getgid) {
+		MLIBC_MISSING_SYSDEP();
+		__ensure(!"Cannot continue without sys_getgid()");
+	}
+	return mlibc::sys_getgid();
+}
+
+gid_t getegid(void) {
+	if(!mlibc::sys_getegid) {
+		MLIBC_MISSING_SYSDEP();
+		__ensure(!"Cannot continue without sys_getegid()");
+	}
+	return mlibc::sys_getegid();
+}
+
+uid_t getuid(void) {
+	if(!mlibc::sys_getuid) {
+		MLIBC_MISSING_SYSDEP();
+		__ensure(!"Cannot continue without sys_getuid()");
+	}
+	return mlibc::sys_getuid();
+}
+
+uid_t geteuid(void) {
+	if(!mlibc::sys_geteuid) {
+		MLIBC_MISSING_SYSDEP();
+		__ensure(!"Cannot continue without sys_geteuid()");
+	}
+	return mlibc::sys_geteuid();
+}
+
+pid_t getpid(void) {
+	if(!mlibc::sys_getpid) {
+		MLIBC_MISSING_SYSDEP();
+		__ensure(!"Cannot continue without sys_getpid()");
+	}
+	return mlibc::sys_getpid();
+}
+
+pid_t getppid(void) {
+	if(!mlibc::sys_getppid) {
+		MLIBC_MISSING_SYSDEP();
+		__ensure(!"Cannot continue without sys_getppid()");
+	}
+	return mlibc::sys_getppid();
+}
+
+int access(const char *path, int mode) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_access, -1);
+	if(int e = mlibc::sys_access(path, mode); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+char *getusershell(void) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+void setusershell(void) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+void endusershell(void) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+int isatty(int fd) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_isatty, 0);
+	if(int e = mlibc::sys_isatty(fd); e) {
+		errno = e;
+		return 0;
+	}
+	return 1;
+}
+
+int chroot(const char *ptr) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_chroot, -1);
+	if(int e = mlibc::sys_chroot(ptr); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int daemon(int, int) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+char *ctermid(char *s) {
+	return s ? strcpy(s, "/dev/tty") : const_cast<char *>("/dev/tty");
+}
+
+int setresuid(uid_t ruid, uid_t euid, uid_t suid) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_setresuid, -1);
+	if(int e = mlibc::sys_setresuid(ruid, euid, suid); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int setresgid(gid_t rgid, gid_t egid, gid_t sgid) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_setresgid, -1);
+	if(int e = mlibc::sys_setresgid(rgid, egid, sgid); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int getdomainname(char *, size_t) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+int setdomainname(const char *, size_t) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_getresuid, -1);
+	if(int e = mlibc::sys_getresuid(ruid, euid, suid); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_getresgid, -1);
+	if(int e = mlibc::sys_getresgid(rgid, egid, sgid); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+#if __MLIBC_CRYPT_OPTION
+void encrypt(char[64], int) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+#endif
+
+#if __MLIBC_BSD_OPTION
+void *sbrk(intptr_t increment) {
+	if(increment) {
+		errno = ENOMEM;
+		return (void *)-1;
+	}
+
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_brk, (void *)-1);
+	void *out;
+	if(int e = mlibc::sys_brk(&out); e) {
+		errno = e;
+		return (void *)-1;
+	}
+	return out;
+}
+#endif