/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
/*
* Syscall definitions for NOLIBC (those in man(2))
* Copyright (C) 2017-2021 Willy Tarreau <w@1wt.eu>
*/
#ifndef _NOLIBC_SYS_H
#define _NOLIBC_SYS_H
#include <stdarg.h>
#include "std.h"
/* system includes */
#include <asm/unistd.h>
#include <asm/signal.h> /* for SIGCHLD */
#include <asm/ioctls.h>
#include <asm/mman.h>
#include <linux/fs.h>
#include <linux/loop.h>
#include <linux/time.h>
#include <linux/auxvec.h>
#include <linux/fcntl.h> /* for O_* and AT_* */
#include <linux/stat.h> /* for statx() */
#include <linux/prctl.h>
#include "arch.h"
#include "errno.h"
#include "types.h"
/* Syscall return helper: takes the syscall value in argument and checks for an
* error in it. This may only be used with signed returns (int or long), but
* not with pointers. An error is any value < 0. When an error is encountered,
* -ret is set into errno and -1 is returned. Otherwise the returned value is
* passed as-is with its type preserved.
*/
#define __sysret(arg) \
({ \
__typeof__(arg) __sysret_arg = (arg); \
(__sysret_arg < 0) /* error ? */ \
? (({ SET_ERRNO(-__sysret_arg); }), -1) /* ret -1 with errno = -arg */ \
: __sysret_arg; /* return original value */ \
})
/* Functions in this file only describe syscalls. They're declared static so
* that the compiler usually decides to inline them while still being allowed
* to pass a pointer to one of their instances. Each syscall exists in two
* versions:
* - the "internal" ones, which matches the raw syscall interface at the
* kernel level, which may sometimes slightly differ from the documented
* libc-level ones. For example most of them return either a valid value
* or -errno. All of these are prefixed with "sys_". They may be called
* by non-portable applications if desired.
*
* - the "exported" ones, whose interface must closely match the one
* documented in man(2), that applications are supposed to expect. These
* ones rely on the internal ones, and set errno.
*
* Each syscall will be defined with the two functions, sorted in alphabetical
* order applied to the exported names.
*
* In case of doubt about the relevance of a function here, only those which
* set errno should be defined here. Wrappers like those appearing in man(3)
* should not be placed here.
*/
/*
* int brk(void *addr);
* void *sbrk(intptr_t inc)
*/
static __attribute__((unused))
void *sys_brk(void *addr)
{
return (void *)my_syscall1(__NR_brk, addr);
}
static __attribute__((unused))
int brk(void *addr)
{
void *ret = sys_brk(addr);
if (!ret) {
SET_ERRNO(ENOMEM);
return -1;
}
return 0;
}
static __attribute__((unused))
void *sbrk(intptr_t inc)
{
/* first call to find current end */
void *ret = sys_brk(0);
if (ret && sys_brk(ret + inc) == ret + inc)
return ret + inc;
SET_ERRNO(ENOMEM);
return (void *)-1;
}
/*
* int chdir(const char *path);
*/
static __attribute__((unused))
int sys_chdir(const char *path)
{
return my_syscall1(__NR_chdir, path);
}
static __attribute__((unused))
int chdir(const char *path)
{
return __sysret(sys_chdir(path));
}
/*
* int chmod(const char *path, mode_t mode);
*/
static __attribute__((unused))
int sys_chmod(const char *path, mode_t mode)
{
#ifdef __NR_fchmodat
return my_syscall4(__NR_fchmodat, AT_FDCWD, path, mode, 0);
#elif defined(__NR_chmod)
return my_syscall2(__NR_chmod, path, mode);
#else
return -ENOSYS;
#endif
}
static __attribute__((unused))
int chmod(const char *path, mode_t mode)
{
return __sysret(sys_chmod(path, mode));
}
/*
* int chown(const char *path, uid_t owner, gid_t group);
*/
static __attribute__((unused))
int sys_chown(const char *path, uid_t owner, gid_t group)
{
#ifdef __NR_fchownat
return my_syscall5(__NR_fchownat, AT_FDCWD, path, owner, group, 0);
#elif defined(__NR_chown)
return my_syscall3(__NR_chown, path, owner, group);
#else
return -ENOSYS;
#endif
}
static __attribute__((unused))
int chown(const char *path, uid_t owner, gid_t group)
{
return __sysret(sys_chown(path, owner, group));
}
/*
* int chroot(const char *path);
*/
static __attribute__((unused))
int sys_chroot(const char *path)
{
return my_syscall1(__NR_chroot, path);
}
static __attribute__((unused))
int chroot(const char *path)
{
return __sysret(sys_chroot(path));
}
/*
* int close(int fd);
*/
static __attribute__((unused))
int sys_close(int fd)
{
return my_syscall1(__NR_close, fd);
}
static __attribute__((unused))
int close(int fd)
{
return __sysret(sys_close(fd));
}
/*
* int dup(int fd);
*/
static __attribute__((unused))
int sys_dup(int fd)
{
return my_syscall1(__NR_dup, fd);
}
static __attribute__((unused))
int dup(int fd)
{
return __sysret(sys_dup(fd));
}
/*
* int dup2(int old, int new);
*/
static __attribute__((unused))
int sys_dup2(int old, int new)
{
#ifdef __NR_dup3
return my_syscall3(__NR_dup3, old, new, 0);
#elif defined(__NR_dup2)
return my_syscall2(__NR_dup2, old, new);
#else
return -ENOSYS;
#endif
}
static __attribute__((unused))
int dup2(int old, int new)
{
return __sysret(sys_dup2(old, new));
}
/*
* int dup3(int old, int new, int flags);
*/
#ifdef __NR_dup3
static __attribute__((unused))
int sys_dup3(int old, int new, int flags)
{
return my_syscall3(__NR_dup3, old, new, flags);
}
static __attribute__((unused))
int dup3(int old, int new, int flags)
{
return __sysret(sys_dup3(old, new, flags));
}
#endif
/*
* int execve(const char *filename, char *const argv[], char *const envp[]);
*/
static __attribute__((unused))
int sys_execve(const char *filename, char *const argv[], char *const envp[])
{
return my_syscall3(__NR_execve, filename, argv, envp);
}
static __attribute__((unused))
int execve(const char *filename, char *const argv[], char *const envp[])
{
return __sysret(sys_execve(filename, argv, envp));
}
/*
* void exit(int status);
*/
static __attribute__((noreturn,unused))
void sys_exit(int status)
{
my_syscall1(__NR_exit, status & 255);
while(1); /* shut the "noreturn" warnings. */
}
static __attribute__((noreturn,unused))
void exit(int status)
{
sys_exit(status);
}
/*
* pid_t fork(void);
*/
#ifndef sys_fork
static __attribute__((unused))
pid_t sys_fork(void)
{
#ifdef __NR_clone
/* note: some archs only have clone() and not fork(). Different archs
* have a different API, but most archs have the flags on first arg and
* will not use the rest with no other flag.
*/
return my_syscall5(__NR_clone, SIGCHLD, 0, 0, 0, 0);
#elif defined(__NR_fork)
return my_syscall0(__NR_fork);
#else
return -ENOSYS;
#endif
}
#endif
static __attribute__((unused))
pid_t fork(void)
{
return __sysret(sys_fork());
}
/*
* int fsync(int fd);
*/
static __attribute__((unused))
int sys_fsync(int fd)
{
return my_syscall1(__NR_fsync, fd);
}
static __attribute__((unused))
int fsync(int fd)
{
return __sysret(sys_fsync(fd));
}
/*
* int getdents64(int fd, struct linux_dirent64 *dirp, int count);
*/
static __attribute__((unused))
int sys_getdents64(int fd, struct linux_dirent64 *dirp, int count)
{
return my_syscall3(__NR_getdents64, fd, dirp, count);
}
static __attribute__((unused))
int getdents64(int fd, struct linux_dirent64 *dirp, int count)
{
return __sysret(sys_getdents64(fd, dirp, count));
}
/*
* uid_t geteuid(void);
*/
static __attribute__((unused))
uid_t sys_geteuid(void)
{
#ifdef __NR_geteuid32
return my_syscall0(__NR_geteuid32);
#else
return my_syscall0(__NR_geteuid);
#endif
}
static __attribute__((unused))
uid_t geteuid(void)
{
return sys_geteuid();
}
/*
* pid_t getpgid(pid_t pid);
*/
static __attribute__((unused))
pid_t sys_getpgid(pid_t pid)
{
return my_syscall1(__NR_getpgid, pid);
}
static __attribute__((unused))
pid_t getpgid(pid_t pid)
{
return __sysret(sys_getpgid(pid));
}
/*
* pid_t getpgrp(void);
*/
static __attribute__((unused))
pid_t sys_getpgrp(void)
{
return sys_getpgid(0);
}
static __attribute__((unused))
pid_t getpgrp(void)
{
return sys_getpgrp();
}
/*
* pid_t getpid(void);
*/
static __attribute__((unused))
pid_t sys_getpid(void)
{
return my_syscall0(__NR_getpid);
}
static __attribute__((unused))
pid_t getpid(void)
{
return sys_getpid();
}
/*
* pid_t getppid(void);
*/
static __attribute__((unused))
pid_t sys_getppid(void)
{
return my_syscall0(__NR_getppid);
}
static __attribute__((unused))
pid_t getppid(void)
{
return sys_getppid();
}
/*
* pid_t gettid(void);
*/
static __attribute__((unused))
pid_t sys_gettid(void)
{
return my_syscall0(__NR_gettid);
}
static __attribute__((unused))
pid_t gettid(void)
{
return sys_gettid();
}
static unsigned long getauxval(unsigned long key);
/*
* int getpagesize(void);
*/
static __attribute__((unused))
int getpagesize(void)
{
return __sysret((int)getauxval(AT_PAGESZ) ?: -ENOENT);
}
/*
* int gettimeofday(struct timeval *tv, struct timezone *tz);
*/
static __attribute__((unused))
int sys_gettimeofday(struct timeval *tv, struct timezone *tz)
{
#ifdef __NR_gettimeofday
return my_syscall2(__NR_gettimeofday, tv, tz);
#else
return -ENOSYS;
#endif
}
static __attribute__((unused))
int gettimeofday(struct timeval *tv, struct timezone *tz)
{
return __sysret(sys_gettimeofday(tv, tz));
}
/*
* uid_t getuid(void);
*/
static __attribute__((unused))
uid_t sys_getuid(void)
{
#ifdef __NR_getuid32
return my_syscall0(__NR_getuid32);
#else
return my_syscall0(__NR_getuid);
#endif
}
static __attribute__((unused))
uid_t getuid(void)
{
return sys_getuid();
}
/*
* int ioctl(int fd, unsigned long req, void *value);
*/
static __attribute__((unused))
int sys_ioctl(int fd, unsigned long req, void *value)
{
return my_syscall3(__NR_ioctl, fd, req, value);
}
static __attribute__((unused))
int ioctl(int fd, unsigned long req, void *value)
{
return __sysret(sys_ioctl(fd, req, value));
}
/*
* int kill(pid_t pid, int signal);
*/
static __attribute__((unused))
int sys_kill(pid_t pid, int signal)
{
return my_syscall2(__NR_kill, pid, signal);
}
static __attribute__((unused))
int kill(pid_t pid, int signal)
{
return __sysret(sys_kill(pid, signal));
}
/*
* int link(const char *old, const char *new);
*/
static __attribute__((unused))
int sys_link(const char *old, const char *new)
{
#ifdef __NR_linkat
return my_syscall5(__NR_linkat, AT_FDCWD, old, AT_FDCWD, new, 0);
#elif defined(__NR_link)
return my_syscall2(__NR_link, old, new);
#else
return -ENOSYS;
#endif
}
static __attribute__((unused))
int link(const char *old, const char *new)
{
return __sysret(sys_link(old, new));
}
/*
* off_t lseek(int fd, off_t offset, int whence);
*/
static __attribute__((unused))
off_t sys_lseek(int fd, off_t offset, int whence)
{
#ifdef __NR_lseek
return my_syscall3(__NR_lseek, fd, offset, whence);
#else
return -ENOSYS;
#endif
}
static __attribute__((unused))
off_t lseek(int fd, off_t offset, int whence)
{
return __sysret(sys_lseek(fd, offset, whence));
}
/*
* int mkdir(const char *path, mode_t mode);
*/
static __attribute__((unused))
int sys_mkdir(const char *path, mode_t mode)
{
#ifdef __NR_mkdirat
return my_syscall3(__NR_mkdirat, AT_FDCWD, path, mode);
#elif defined(__NR_mkdir)
return my_syscall2(__NR_mkdir, path, mode);
#else
return -ENOSYS;
#endif
}
static __attribute__((unused))
int mkdir(const char *path, mode_t mode)
{
return __sysret(sys_mkdir(path, mode));
}
/*
* int rmdir(const char *path);
*/
static __attribute__((unused))
int sys_rmdir(const char *path)
{
#ifdef __NR_rmdir
return my_syscall1(__NR_rmdir, path);
#elif defined(__NR_unlinkat)
return my_syscall3(__NR_unlinkat, AT_FDCWD, path, AT_REMOVEDIR);
#else
return -ENOSYS;
#endif
}
static __attribute__((unused))
int rmdir(const char *path)
{
return __sysret(sys_rmdir(path));
}
/*
* int mknod(const char *path, mode_t mode, dev_t dev);
*/
static __attribute__((unused))
long sys_mknod(const char *path, mode_t mode, dev_t dev)
{
#ifdef __NR_mknodat
return my_syscall4(__NR_mknodat, AT_FDCWD, path, mode, dev);
#elif defined(__NR_mknod)
return my_syscall3(__NR_mknod, path, mode, dev);
#else
return -ENOSYS;
#endif
}
static __attribute__((unused))
int mknod(const char *path, mode_t mode, dev_t dev)
{
return __sysret(sys_mknod(path, mode, dev));
}
#ifndef sys_mmap
static __attribute__((unused))
void *sys_mmap(void *addr, size_t length, int prot, int flags, int fd,
off_t offset)
{
int n;
#if defined(__NR_mmap2)
n = __NR_mmap2;
offset >>= 12;
#else
n = __NR_mmap;
#endif
return (void *)my_syscall6(n, addr, length, prot, flags, fd, offset);
}
#endif
/* Note that on Linux, MAP_FAILED is -1 so we can use the generic __sysret()
* which returns -1 upon error and still satisfy user land that checks for
* MAP_FAILED.
*/
static __attribute__((unused))
void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset)
{
void *ret = sys_mmap(addr, length, prot, flags, fd, offset);
if ((unsigned long)ret >= -4095UL) {
SET_ERRNO(-(long)ret);
ret = MAP_FAILED;
}
return ret;
}
static __attribute__((unused))
int sys_munmap(void *addr, size_t length)
{
return my_syscall2(__NR_munmap, addr, length);
}
static __attribute__((unused))
int munmap(void *addr, size_t length)
{
return __sysret(sys_munmap(addr, length));
}
/*
* int mount(const char *source, const char *target,
* const char *fstype, unsigned long flags,
* const void *data);
*/
static __attribute__((unused))
int sys_mount(const char *src, const char *tgt, const char *fst,
unsigned long flags, const void *data)
{
return my_syscall5(__NR_mount, src, tgt, fst, flags, data);
}
static __attribute__((unused))
int mount(const char *src, const char *tgt,
const char *fst, unsigned long flags,
const void *data)
{
return __sysret(sys_mount(src, tgt, fst, flags, data));
}
/*
* int open(const char *path, int flags[, mode_t mode]);
*/
static __attribute__((unused))
int sys_open(const char *path, int flags, mode_t mode)
{
#ifdef __NR_openat
return my_syscall4(__NR_openat, AT_FDCWD, path, flags, mode);
#elif defined(__NR_open)
return my_syscall3(__NR_open, path, flags, mode);
#else
return -ENOSYS;
#endif
}
static __attribute__((unused))
int open(const char *path, int flags, ...)
{
mode_t mode = 0;
if (flags & O_CREAT) {
va_list args;
va_start(args, flags);
mode = va_arg(args, int);
va_end(args);
}
return __sysret(sys_open(path, flags, mode));
}
/*
* int pipe2(int pipefd[2], int flags);
* int pipe(int pipefd[2]);
*/
static __attribute__((unused))
int sys_pipe2(int pipefd[2], int flags)
{
return my_syscall2(__NR_pipe2, pipefd, flags);
}
static __attribute__((unused))
int pipe2(int pipefd[2], int flags)
{
return __sysret(sys_pipe2(pipefd, flags));
}
static __attribute__((unused))
int pipe(int pipefd[2])
{
return pipe2(pipefd, 0);
}
/*
* int prctl(int option, unsigned long arg2, unsigned long arg3,
* unsigned long arg4, unsigned long arg5);
*/
static __attribute__((unused))
int sys_prctl(int option, unsigned long arg2, unsigned long arg3,
unsigned long arg4, unsigned long arg5)
{
return my_syscall5(__NR_prctl, option, arg2, arg3, arg4, arg5);
}
static __attribute__((unused))
int prctl(int option, unsigned long arg2, unsigned long arg3,
unsigned long arg4, unsigned long arg5)
{
return __sysret(sys_prctl(option, arg2, arg3, arg4, arg5));
}
/*
* int pivot_root(const char *new, const char *old);
*/
static __attribute__((unused))
int sys_pivot_root(const char *new, const char *old)
{
return my_syscall2(__NR_pivot_root, new, old);
}
static __attribute__((unused))
int pivot_root(const char *new, const char *old)
{
return __sysret(sys_pivot_root(new, old));
}
/*
* int poll(struct pollfd *fds, int nfds, int timeout);
*/
static __attribute__((unused))
int sys_poll(struct pollfd *fds, int nfds, int timeout)
{
#if defined(__NR_ppoll)
struct timespec t;
if (timeout >= 0) {
t.tv_sec = timeout / 1000;
t.tv_nsec = (timeout % 1000) * 1000000;
}
return my_syscall5(__NR_ppoll, fds, nfds, (timeout >= 0) ? &t : NULL, NULL, 0);
#elif defined(__NR_poll)
return my_syscall3(__NR_poll, fds, nfds, timeout);
#else
return -ENOSYS;
#endif
}
static __attribute__((unused))
int poll(struct pollfd *fds, int nfds, int timeout)
{
return __sysret(sys_poll(fds, nfds, timeout));
}
/*
* ssize_t read(int fd, void *buf, size_t count);
*/
static __attribute__((unused))
ssize_t sys_read(int fd, void *buf, size_t count)
{
return my_syscall3(__NR_read, fd, buf, count);
}
static __attribute__((unused))
ssize_t read(int fd, void *buf, size_t count)
{
return __sysret(sys_read(fd, buf, count));
}
/*
* int reboot(int cmd);
* <cmd> is among LINUX_REBOOT_CMD_*
*/
static __attribute__((unused))
ssize_t sys_reboot(int magic1, int magic2, int cmd, void *arg)
{
return my_syscall4(__NR_reboot, magic1, magic2, cmd, arg);
}
static __attribute__((unused))
int reboot(int cmd)
{
return __sysret(sys_reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, cmd, 0));
}
/*
* int sched_yield(void);
*/
static __attribute__((unused))
int sys_sched_yield(void)
{
return my_syscall0(__NR_sched_yield);
}
static __attribute__((unused))
int sched_yield(void)
{
return __sysret(sys_sched_yield());
}
/*
* int select(int nfds, fd_set *read_fds, fd_set *write_fds,
* fd_set *except_fds, struct timeval *timeout);
*/
static __attribute__((unused))
int sys_select(int nfds, fd_set *rfds, fd_set *wfds, fd_set *efds, struct timeval *timeout)
{
#if defined(__ARCH_WANT_SYS_OLD_SELECT) && !defined(__NR__newselect)
struct sel_arg_struct {
unsigned long n;
fd_set *r, *w, *e;
struct timeval *t;
} arg = { .n = nfds, .r = rfds, .w = wfds, .e = efds, .t = timeout };
return my_syscall1(__NR_select, &arg);
#elif defined(__ARCH_WANT_SYS_PSELECT6) && defined(__NR_pselect6)
struct timespec t;
if (timeout) {
t.tv_sec = timeout->tv_sec;
t.tv_nsec = timeout->tv_usec * 1000;
}
return my_syscall6(__NR_pselect6, nfds, rfds, wfds, efds, timeout ? &t : NULL, NULL);
#elif defined(__NR__newselect) || defined(__NR_select)
#ifndef __NR__newselect
#define __NR__newselect __NR_select
#endif
return my_syscall5(__NR__newselect, nfds, rfds, wfds, efds, timeout);
#else
return -ENOSYS;
#endif
}
static __attribute__((unused))
int select(int nfds, fd_set *rfds, fd_set *wfds, fd_set *efds, struct timeval *timeout)
{
return __sysret(sys_select(nfds, rfds, wfds, efds, timeout));
}
/*
* int setpgid(pid_t pid, pid_t pgid);
*/
static __attribute__((unused))
int sys_setpgid(pid_t pid, pid_t pgid)
{
return my_syscall2(__NR_setpgid, pid, pgid);
}
static __attribute__((unused))
int setpgid(pid_t pid, pid_t pgid)
{
return __sysret(sys_setpgid(pid, pgid));
}
/*
* pid_t setsid(void);
*/
static __attribute__((unused))
pid_t sys_setsid(void)
{
return my_syscall0(__NR_setsid);
}
static __attribute__((unused))
pid_t setsid(void)
{
return __sysret(sys_setsid());
}
/*
* int statx(int fd, const char *path, int flags, unsigned int mask, struct statx *buf);
* int stat(const char *path, struct stat *buf);
*/
static __attribute__((unused))
int sys_statx(int fd, const char *path, int flags, unsigned int mask, struct statx *buf)
{
#ifdef __NR_statx
return my_syscall5(__NR_statx, fd, path, flags, mask, buf);
#else
return -ENOSYS;
#endif
}
static __attribute__((unused))
int statx(int fd, const char *path, int flags, unsigned int mask, struct statx *buf)
{
return __sysret(sys_statx(fd, path, flags, mask, buf));
}
static __attribute__((unused))
int stat(const char *path, struct stat *buf)
{
struct statx statx;
long ret;
ret = __sysret(sys_statx(AT_FDCWD, path, AT_NO_AUTOMOUNT, STATX_BASIC_STATS, &statx));
if (ret == -1)
return ret;
buf->st_dev = ((statx.stx_dev_minor & 0xff)
| (statx.stx_dev_major << 8)
| ((statx.stx_dev_minor & ~0xff) << 12));
buf->st_ino = statx.stx_ino;
buf->st_mode = statx.stx_mode;
buf->st_nlink = statx.stx_nlink;
buf->st_uid = statx.stx_uid;
buf->st_gid = statx.stx_gid;
buf->st_rdev = ((statx.stx_rdev_minor & 0xff)
| (statx.stx_rdev_major << 8)
| ((statx.stx_rdev_minor & ~0xff) << 12));
buf->st_size = statx.stx_size;
buf->st_blksize = statx.stx_blksize;
buf->st_blocks = statx.stx_blocks;
buf->st_atim.tv_sec = statx.stx_atime.tv_sec;
buf->st_atim.tv_nsec = statx.stx_atime.tv_nsec;
buf->st_mtim.tv_sec = statx.stx_mtime.tv_sec;
buf->st_mtim.tv_nsec = statx.stx_mtime.tv_nsec;
buf->st_ctim.tv_sec = statx.stx_ctime.tv_sec;
buf->st_ctim.tv_nsec = statx.stx_ctime.tv_nsec;
return 0;
}
/*
* int symlink(const char *old, const char *new);
*/
static __attribute__((unused))
int sys_symlink(const char *old, const char *new)
{
#ifdef __NR_symlinkat
return my_syscall3(__NR_symlinkat, old, AT_FDCWD, new);
#elif defined(__NR_symlink)
return my_syscall2(__NR_symlink, old, new);
#else
return -ENOSYS;
#endif
}
static __attribute__((unused))
int symlink(const char *old, const char *new)
{
return __sysret(sys_symlink(old, new));
}
/*
* mode_t umask(mode_t mode);
*/
static __attribute__((unused))
mode_t sys_umask(mode_t mode)
{
return my_syscall1(__NR_umask, mode);
}
static __attribute__((unused))
mode_t umask(mode_t mode)
{
return sys_umask(mode);
}
/*
* int umount2(const char *path, int flags);
*/
static __attribute__((unused))
int sys_umount2(const char *path, int flags)
{
return my_syscall2(__NR_umount2, path, flags);
}
static __attribute__((unused))
int umount2(const char *path, int flags)
{
return __sysret(sys_umount2(path, flags));
}
/*
* int unlink(const char *path);
*/
static __attribute__((unused))
int sys_unlink(const char *path)
{
#ifdef __NR_unlinkat
return my_syscall3(__NR_unlinkat, AT_FDCWD, path, 0);
#elif defined(__NR_unlink)
return my_syscall1(__NR_unlink, path);
#else
return -ENOSYS;
#endif
}
static __attribute__((unused))
int unlink(const char *path)
{
return __sysret(sys_unlink(path));
}
/*
* pid_t wait(int *status);
* pid_t wait4(pid_t pid, int *status, int options, struct rusage *rusage);
* pid_t waitpid(pid_t pid, int *status, int options);
*/
static __attribute__((unused))
pid_t sys_wait4(pid_t pid, int *status, int options, struct rusage *rusage)
{
#ifdef __NR_wait4
return my_syscall4(__NR_wait4, pid, status, options, rusage);
#else
return -ENOSYS;
#endif
}
static __attribute__((unused))
pid_t wait(int *status)
{
return __sysret(sys_wait4(-1, status, 0, NULL));
}
static __attribute__((unused))
pid_t wait4(pid_t pid, int *status, int options, struct rusage *rusage)
{
return __sysret(sys_wait4(pid, status, options, rusage));
}
static __attribute__((unused))
pid_t waitpid(pid_t pid, int *status, int options)
{
return __sysret(sys_wait4(pid, status, options, NULL));
}
/*
* ssize_t write(int fd, const void *buf, size_t count);
*/
static __attribute__((unused))
ssize_t sys_write(int fd, const void *buf, size_t count)
{
return my_syscall3(__NR_write, fd, buf, count);
}
static __attribute__((unused))
ssize_t write(int fd, const void *buf, size_t count)
{
return __sysret(sys_write(fd, buf, count));
}
/*
* int memfd_create(const char *name, unsigned int flags);
*/
static __attribute__((unused))
int sys_memfd_create(const char *name, unsigned int flags)
{
return my_syscall2(__NR_memfd_create, name, flags);
}
static __attribute__((unused))
int memfd_create(const char *name, unsigned int flags)
{
return __sysret(sys_memfd_create(name, flags));
}
/* make sure to include all global symbols */
#include "nolibc.h"
#endif /* _NOLIBC_SYS_H */