List of Linux/i386 system calls

Copyright (C) 1999 by Konstantin Boldyshev

(primary url for this document is http://lightning.voshod.com/asm/syscall.html)

List is under heavy construction, some entries may be incorrect or missing. If you are willing (and able) to help, please contact me ! It's absolutely obvious that I have to (and will) use sgml or xml (with my own dtd) further, instead of html..

Note: these are not libc "system calls", but real system calls provided by Linux Kernel.

List covers Linux 2.2 (and mostly Linux 2.0). All system calls introduced/removed in Linux 2.2 are marked with (+/-2.2) label. Square brackets hold real kernel name of system call from arch/i386/kernel/entry.S (as appeared in Syntax), if it differs from "official" in include/asm-i386/unistd.h.

Sources of information (except other directly pointed):

include/asm-i386/unistd.h
arch/i386/kernel/entry.S
include/linux/sys.h

System call details

0. sys_setup

Syntax: int sys_setup(void)

Source: fs/filesystems.c

Action: return -ENOSYS on Linux 2.2

Details: old sys_setup call

1. sys_exit

Syntax: int sys_exit(int status)

Source: kernel/exit.c

Action: Terminate current process, return status to caller.

Details:

2. sys_fork

Syntax: int sys_fork(struct pt_regs regs)

Source: arch/i386/kernel/process.c

Action:

Details:

3. sys_read

Syntax: ssize_t sys_read(unsigned int fd, char * buf, size_t count)

Source: fs/read_write.c

Action:

Details:

4. sys_write

Syntax: ssize_t sys_write(unsigned int fd, const char * buf, size_t count)

Source: fs/read_write.c

Action:

Details:

5. sys_open

Syntax: int sys_open(const char * filename, int flags, int mode)

Source: fs/open.c

Action:

Details:

6. sys_close

Syntax: sys_close(unsigned int fd)

Source: fs/open.c

Action:

Details:

7. sys_waitpid

Syntax: int sys_waitpid(pid_t pid,unsigned int * stat_addr, int options)

Source: kernel/exit.c

Action:

Details:

8. sys_creat

Syntax: int sys_creat(const char * pathname, int mode)

Source: fs/open.c

Action:

Details:

9. sys_link

Syntax: int sys_link(const char * oldname, const char * newname)

Source: fs/namei.c

Action:

Details:

10. sys_unlink

Syntax: int sys_unlink(const char * pathname)

Source: fs/namei.c

Action:

Details:

11. sys_execve

Syntax: int sys_execve(struct pt_regs regs)

Source: arch/i386/kernel/process.c

Action:

Details:

12. sys_chdir

Syntax: int sys_chdir(const char * filename)

Source: fs/open.c

Action:

Details:

13. sys_time

Syntax: int sys_time(int * tloc)

Source: kernel/time.c

Action:

Details:

14. sys_mknod

Syntax: int sys_mknod(const char * filename, int mode, dev_t dev)

Source: fs/namei.c

Action:

Details:

15. sys_chmod

Syntax: int sys_chmod(const char * filename, mode_t mode)

Source: fs/open.c

Action:

Details:

16. sys_lchown

Syntax: int sys_lchown(const char * filename, uid_t user, gid_t group)

Source: fs/open.c

Action:

Details:

17. sys_break

Syntax: int sys_break(void)

Source: kernel/sys.c

Action: return -ENOSYS

Details: call exists only for compatibility

18. sys_oldstat

Syntax: int sys_stat(char * filename, struct __old_kernel_stat * statbuf)

Source: fs/stat.c

Action:

Details:

19. sys_lseek

Syntax: off_t sys_lseek(unsigned int fd, off_t offset, unsigned int origin)

Source: fs/read_write.c

Action:

Details:

20. sys_getpid

Syntax: int sys_getpid(void)

Source: kernel/sched.c

Action:

Details:

21. sys_mount

Syntax: int sys_mount(char * dev_name, char * dir_name, char * type, unsigned long new_flags, void * data)

Source: fs/super.c

Action:

Details:

22. sys_umount

Syntax: int sys_oldumount(char * name)

Source: fs/super.c

Action:

Details:

23. sys_setuid

Syntax: int sys_setuid(uid_t uid)

Source: kernel/sys.c

Action:

Details:

24. sys_getuid

Syntax: int sys_getuid(void)

Source: kernel/sys.c

Action:

Details:

25. sys_stime

Syntax: int sys_stime(int * tptr)

Source: kernel/time.c

Action:

Details:

26. sys_ptrace

Syntax: int sys_ptrace(long request, long pid, long addr, long data)

Source: arch/i386/kernel/ptrace.c

Action:

Details:

27. sys_alarm

Syntax: unsigned int sys_alarm(unsigned int seconds)

Source: kernel/sched.c

Action:

Details:

28. sys_oldfstat

Syntax: int sys_fstat(unsigned int fd, struct __old_kernel_stat * statbuf)

Source: fs/stat.c

Action:

Details:

29. sys_pause

Syntax: int sys_pause(void)

Source: arch/i386/kernel/sys_i386.c

Action:

Details:

30. sys_utime

Syntax: int sys_utime(char * filename, struct utimbuf * times)

Source: fs/open.c

Action:

Details:

List by kernel source

arch/i386/ (23) fs/ (62) ipc/ (11) kernel/ (81) mm/ (12) net/ (1)

arch/i386/

arch/i386/kernel/sys_i386.c

int sys_pipe(unsigned long * fildes)
int sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
int sys_uname(struct old_utsname * name)
int sys_olduname(struct oldold_utsname * name)
int sys_pause(void)
int old_mmap(struct mmap_arg_struct *arg)

arch/i386/kernel/ioport.c

int sys_ioperm(unsigned long from, unsigned long num, int turn_on)
int sys_iopl(unsigned long unused)

arch/i386/kernel/process.c

int sys_idle(void)
int sys_fork(struct pt_regs regs)
int sys_clone(struct pt_regs regs)
int sys_vfork(struct pt_regs regs)
int sys_execve(struct pt_regs regs)

arch/i386/kernel/vm86.c

int sys_vm86old(struct vm86_struct * v86)
int sys_vm86(unsigned long subfunction, struct vm86plus_struct * v86)

arch/i386/kernel/ptrace.c

int sys_ptrace(long request, long pid, long addr, long data)

arch/i386/kernel/signal.c

int sys_sigsuspend(int history0, int history1, old_sigset_t mask)
int sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize)
int sys_sigaction(int sig, const struct old_sigaction *act, struct old_sigaction *oact)
int sys_sigaltstack(const stack_t *uss, stack_t *uoss)
int sys_sigreturn(unsigned long __unused)
int sys_rt_sigreturn(unsigned long __unused)

arch/i386/kernel/ldt.c

int sys_modify_ldt(int func, void *ptr, unsigned long bytecount)

fs/

fs/stat.c

int sys_stat(char * filename, struct __old_kernel_stat * statbuf)
int sys_newstat(char * filename, struct stat * statbuf)
int sys_lstat(char * filename, struct __old_kernel_stat * statbuf)
int sys_newlstat(char * filename, struct stat * statbuf)
int sys_fstat(unsigned int fd, struct __old_kernel_stat * statbuf)
int sys_newfstat(unsigned int fd, struct stat * statbuf)
int sys_readlink(const char * path, char * buf, int bufsiz)

fs/read_write.c

off_t sys_lseek(unsigned int fd, off_t offset, unsigned int origin)
int sys_llseek(unsigned int fd, unsigned long offset_high, unsigned long offset_low, loff_t * result, unsigned int origin)
ssize_t sys_read(unsigned int fd, char * buf, size_t count)
ssize_t sys_write(unsigned int fd, const char * buf, size_t count)
ssize_t sys_readv(unsigned long fd, const struct iovec * vector, unsigned long count)
ssize_t sys_writev(unsigned long fd, const struct iovec * vector, unsigned long count)
ssize_t sys_pread(unsigned int fd, char * buf, size_t count, loff_t pos)
ssize_t sys_pwrite(unsigned int fd, const char * buf, size_t count, loff_t pos)

fs/buffer.c

int sys_sync(void)
int sys_fsync(unsigned int fd)
int sys_fdatasync(unsigned int fd)
int sys_bdflush(int func, long data)

fs/open.c

int sys_statfs(const char * path, struct statfs * buf)
int sys_fstatfs(unsigned int fd, struct statfs * buf)
int sys_truncate(const char * path, unsigned long length)
int sys_ftruncate(unsigned int fd, unsigned long length)
int sys_utime(char * filename, struct utimbuf * times)
int sys_utimes(char * filename, struct timeval * utimes)
int sys_access(const char * filename, int mode)
int sys_chdir(const char * filename)
int sys_fchdir(unsigned int fd)
int sys_chroot(const char * filename)
int sys_fchmod(unsigned int fd, mode_t mode)
int sys_chmod(const char * filename, mode_t mode)
int sys_chown(const char * filename, uid_t user, gid_t group)
int sys_lchown(const char * filename, uid_t user, gid_t group)
int sys_fchown(unsigned int fd, uid_t user, gid_t group)
int sys_open(const char * filename, int flags, int mode)
int sys_creat(const char * pathname, int mode)
int sys_close(unsigned int fd)
int sys_vhangup(void)

fs/exec.c

int sys_uselib(const char * library)

fs/super.c

int sys_sysfs(int option, unsigned long arg1, unsigned long arg2)
int sys_ustat(dev_t dev, struct ustat * ubuf)
int sys_umount(char * name, int flags)
int sys_oldumount(char * name)
int sys_mount(char * dev_name, char * dir_name, char * type, unsigned long new_flags, void * data)

fs/fcntl.c

int sys_dup2(unsigned int oldfd, unsigned int newfd)
int sys_dup(unsigned int fildes)
long sys_fcntl(unsigned int fd, unsigned int cmd, unsigned long arg)

fs/namei.c

int sys_mknod(const char * filename, int mode, dev_t dev)
int sys_mkdir(const char * pathname, int mode)
int sys_rmdir(const char * pathname)
int sys_unlink(const char * pathname)
int sys_symlink(const char * oldname, const char * newname)
int sys_link(const char * oldname, const char * newname)
int sys_rename(const char * oldname, const char * newname)

fs/ioctl.c

int sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)

fs/select.c

int sys_select(int n, fd_set *inp, fd_set *outp, fd_set *exp, struct timeval *tvp)
int sys_poll(struct pollfd * ufds, unsigned int nfds, long timeout)

fs/locks.c

int sys_flock(unsigned int fd, unsigned int cmd)

fs/filesystems.c

int sys_nfsservctl(int cmd, void *argp, void *resp) [fs/nfsd/nfsctl.c]

fs/dquot.c

int sys_quotactl(int cmd, const char *special, int id, caddr_t addr)

fs/dcache.c

int sys_getcwd(char *buf, unsigned long size)

fs/readdir.c

int sys_getdents(unsigned int fd, void * dirent, unsigned int count)

ipc/

ipc/msg.c

int sys_msgsnd (int msqid, struct msgbuf *msgp, size_t msgsz, int msgflg)
int sys_msgrcv (int msqid, struct msgbuf *msgp, size_t msgsz, long msgtyp, int msgflg)
int sys_msgget (key_t key, int msgflg)
int sys_msgctl (int msqid, int cmd, struct msqid_ds *buf)

ipc/sem.c

int sys_semget (key_t key, int nsems, int semflg)
int sys_semctl (int semid, int semnum, int cmd, union semun arg)
int sys_semop (int semid, struct sembuf *tsops, unsigned nsops)

ipc/shm.c

int sys_shmget (key_t key, int size, int shmflg)
int sys_shmctl (int shmid, int cmd, struct shmid_ds *buf)
int sys_shmat (int shmid, char *shmaddr, int shmflg, ulong *raddr)
int sys_shmdt (char *shmaddr)

kernel/

kernel/sched.c

unsigned int sys_alarm(unsigned int seconds)
int sys_getpid(void)
int sys_getppid(void)
int sys_getuid(void)
int sys_geteuid(void)
int sys_getgid(void)
int sys_getegid(void)
int sys_nice(int increment)
int sys_sched_setscheduler(pid_t pid, int policy, struct sched_param *param)
int sys_sched_setparam(pid_t pid, struct sched_param *param)
int sys_sched_getscheduler(pid_t pid)
int sys_sched_getparam(pid_t pid, struct sched_param *param)
int sys_sched_yield(void)
int sys_sched_get_priority_max(int policy)
int sys_sched_get_priority_min(int policy)
int sys_sched_rr_get_interval(pid_t pid, struct timespec *interval)
int sys_nanosleep(struct timespec *rqtp, struct timespec *rmtp)

kernel/exit.c

int sys_exit(int error_code)
int sys_wait4(pid_t pid,unsigned int * stat_addr, int options, struct rusage * ru)
int sys_waitpid(pid_t pid,unsigned int * stat_addr, int options)

kernel/signal.c

int sys_rt_sigprocmask(int how, sigset_t *set, sigset_t *oset, size_t sigsetsize)
int sys_rt_sigpending(sigset_t *set, size_t sigsetsize)
int sys_rt_sigtimedwait(const sigset_t *uthese, siginfo_t *uinfo, const struct timespec *uts, size_t sigsetsize)
int sys_kill(int pid, int sig)
int sys_rt_sigqueueinfo(int pid, int sig, siginfo_t *uinfo)
int sys_sigprocmask(int how, old_sigset_t *set, old_sigset_t *oset)
int sys_sigpending(old_sigset_t *set)
int sys_rt_sigaction(int sig, const struct sigaction *act, struct sigaction *oact, size_t sigsetsize)
int sys_sgetmask(void)
int sys_ssetmask(int newmask)
unsigned long sys_signal(int sig, __sighandler_t handler)

kernel/printk.c

int sys_syslog(int type, char * buf, int len)

kernel/sys.c

int sys_ni_syscall(void)
int sys_setpriority(int which, int who, int niceval)
int sys_getpriority(int which, int who)
int sys_reboot(int magic1, int magic2, int cmd, void * arg)
int sys_setregid(gid_t rgid, gid_t egid)
int sys_setgid(gid_t gid)
int sys_setreuid(uid_t ruid, uid_t euid)
int sys_setuid(uid_t uid)
int sys_setresuid(uid_t ruid, uid_t euid, uid_t suid)
int sys_getresuid(uid_t *ruid, uid_t *euid, uid_t *suid)
int sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid)
int sys_getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid)
int sys_setfsuid(uid_t uid)
long sys_times(struct tms * tbuf)
int sys_setpgid(pid_t pid, pid_t pgid)
int sys_getpgid(pid_t pid)
int sys_getpgrp(void)
int sys_getsid(pid_t pid)
int sys_setsid(void)
int sys_getgroups(int gidsetsize, gid_t *grouplist)
int sys_setgroups(int gidsetsize, gid_t *grouplist)
int sys_newuname(struct new_utsname * name)
int sys_sethostname(char *name, int len)
int sys_gethostname(char *name, int len)
int sys_setdomainname(char *name, int len)
int sys_getrlimit(unsigned int resource, struct rlimit *rlim)
int sys_setrlimit(unsigned int resource, struct rlimit *rlim)
int sys_getrusage(int who, struct rusage *ru)
int sys_umask(int mask)
int sys_prctl(int option, unsigned long arg2, unsigned long arg3, unsigned long arg4, unsigned long arg5)

kernel/module.c

unsigned long sys_create_module(const char *name_user, size_t size)
int sys_init_module(const char *name_user, struct module *mod_user)
int sys_delete_module(const char *name_user)
int sys_query_module(const char *name_user, int which, char *buf, size_t bufsize, size_t *ret)
int sys_get_kernel_syms(struct kernel_sym *table)
unsigned long sys_create_module(const char *name_user, size_t size)

kernel/itimer.c

int sys_getitimer(int which, struct itimerval *value)
int sys_setitimer(int which, struct itimerval *value, struct itimerval *ovalue)

kernel/info.c

int sys_sysinfo(struct sysinfo *info)

kernel/time.c

int sys_time(int * tloc)
int sys_stime(int * tptr)
int sys_gettimeofday(struct timeval *tv, struct timezone *tz)
int sys_settimeofday(struct timeval *tv, struct timezone *tz)
int sys_adjtimex(struct timex *txc_p)

kernel/exec_domain.c

int sys_adjtimex(struct timex *txc_p)

kernel/sysctl.c

int sys_sysctl(struct __sysctl_args *args)

kernel/acct.c

int sys_acct(const char *name)

kernel/capability.c

int sys_capget(cap_user_header_t header, cap_user_data_t dataptr)
int sys_capset(cap_user_header_t header, const cap_user_data_t data)

mm/

mm/mmap.c

unsigned long sys_brk(unsigned long brk)
int sys_munmap(unsigned long addr, size_t len)

mm/mprotect.c

int sys_mprotect(unsigned long start, size_t len, unsigned long prot)

mm/filemap.c

ssize_t sys_sendfile(int out_fd, int in_fd, off_t *offset, size_t count)
int sys_msync(unsigned long start, size_t len, int flags)

mm/mlock.c

int sys_mlock(unsigned long start, size_t len)
int sys_munlock(unsigned long start, size_t len)
int sys_mlockall(int flags)
int sys_munlockall(void)

mm/swapfile.c

int sys_swapoff(const char * specialfile)
int sys_swapon(const char * specialfile, int swap_flags)

mm/mremap.c

unsigned long sys_mremap(unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags)

net/

net/socket.c

int sys_socketcall(int call, unsigned long *args)

 int sys_socket(int family, int type, int protocol)
 int sys_socketpair(int family, int type, int protocol, int usockvec[2])
 int sys_bind(int fd, struct sockaddr *umyaddr, int addrlen)
 int sys_listen(int fd, int backlog)
 int sys_accept(int fd, struct sockaddr *upeer_sockaddr, int *upeer_addrlen)
 int sys_connect(int fd, struct sockaddr *uservaddr, int addrlen)
 int sys_getsockname(int fd, struct sockaddr *usockaddr, int *usockaddr_len)
 int sys_getpeername(int fd, struct sockaddr *usockaddr, int *usockaddr_len)
 int sys_sendto(int fd, void * buff, size_t len, unsigned flags, struct sockaddr *addr, int addr_len)
 int sys_send(int fd, void * buff, size_t len, unsigned flags)
 int sys_recvfrom(int fd, void * ubuf, size_t size, unsigned flags, struct sockaddr *addr, int *addr_len)
 int sys_recv(int fd, void * ubuf, size_t size, unsigned flags)
 int sys_setsockopt(int fd, int level, int optname, char *optval, int optlen)
 int sys_getsockopt(int fd, int level, int optname, char *optval, int *optlen)
 int sys_shutdown(int fd, int how)
 int sys_sendmsg(int fd, struct msghdr *msg, unsigned flags)
 int sys_recvmsg(int fd, struct msghdr *msg, unsigned int flags)