syscalls man page on CentOS

Man page or keyword search:  
man Server   8420 pages
apropos Keyword Search (all sections)
Output format
CentOS logo
[printable version]

SYSCALLS(2)		   Linux Programmer's Manual		   SYSCALLS(2)

NAME
       none - list of all system calls

SYNOPSIS
       Linux 2.4 system calls.

DESCRIPTION
       The system call is the fundamental interface between an application and
       the Linux kernel. As of Linux  2.4.17,  there  are  1100	 system	 calls
       listed  in  /usr/src/linux/include/asm-*/unistd.h.  This man page lists
       those that are common to most platforms.

       _llseek(2), _newselect(2), _sysctl(2), accept(2),  access(2),  acct(2),
       adjtimex(2), afs_syscall, alarm(2), bdflush(2), bind(2), break, brk(2),
       cacheflush(2),  capget(2),  capset(2),  chdir(2),  chmod(2),  chown(2),
       chown32,	 chroot(2),  clone(2),	close(2),  connect(2),	creat(2), cre‐
       ate_module(2), delete_module(2), dup(2), dup2(2),  execve(2),  exit(2),
       fchdir(2),  fchmod(2),  fchown(2),  fchown32, fcntl(2), fcntl64, fdata‐
       sync(2), flock(2), fork(2), fstat(2),  fstat64,	fstatfs(2),  fsync(2),
       ftime,  ftruncate(2),  ftruncate64, get_kernel_syms(2), getcwd(2), get‐
       dents(2), getdents64,  getegid(2),  getegid32,  geteuid(2),  geteuid32,
       getgid(2),  getgid32,  getgroups(2),  getgroups32,  getitimer(2),  get‐
       pagesize(2),  getpeername(2),  getpmsg,	getpgid(2),  getpgrp(2),  get‐
       pid(2),	getppid(2),  getpriority(2),  getresgid(2),  getresgid32, get‐
       resuid(2), getresuid32,	getrlimit(2),  getrusage(2),  getsid(2),  get‐
       sockname(2),  getsockopt(2),  gettid,  gettimeofday(2), getuid(2), get‐
       uid32,  gtty,  idle,  init_module(2),  ioctl(2),	 ioperm(2),   iopl(2),
       ipc(2),	 kill(2),   lchown(2),	lchown32,  link(2),  listen(2),	 lock,
       lseek(2),  lstat(2),   lstat64,	 madvise(2),   mincore(2),   mkdir(2),
       mknod(2),  mlock(2),  mlockall(2),  mmap(2),  modify_ldt(2),  mount(2),
       mprotect(2), mpx, mremap(2), msync(2), munlock(2), munlockall(2),  mun‐
       map(2),	 nanosleep(2),	nfsservctl(2),	nice(2),  oldfstat,  oldlstat,
       oldolduname, oldstat, oldumount, olduname, open(2), pause(2), personal‐
       ity(2),	phys,  pipe(2),	 pivot_root(2),	 poll(2),  prctl(2), pread(2),
       prof, profil,  ptrace(2),  putpmsg,  pwrite(2),	query_module(2),  quo‐
       tactl(2),   read(2),   readahead,  readdir(2),  readlink(2),  readv(2),
       reboot(2),  recv(2),  recvfrom(2),  recvmsg(2),	rename(2),   rmdir(2),
       rt_sigaction, rt_sigpending, rt_sigprocmask, rt_sigqueueinfo, rt_sigre‐
       turn,   rt_sigsuspend,	rt_sigtimedwait,    sched_get_priority_max(2),
       sched_get_priority_min(2),   sched_getparam(2),	sched_getscheduler(2),
       sched_rr_get_interval(2),   sched_setparam(2),	sched_setscheduler(2),
       sched_yield(2),	security, select(2), sendfile(2), send(2), sendmsg(2),
       sendto(2), setdomainname(2), setfsgid(2), setfsgid32, setfsuid(2), set‐
       fsuid32,	  setgid(2),   setgid32,   setgroups(2),   setgroups32,	  set‐
       hostname(2),  setitimer(2),  setpgid(2),	 setpriority(2),  setregid(2),
       setregid32,  setresgid(2), setresgid32, setresuid(2), setresuid32, set‐
       reuid(2),  setreuid32,  setrlimit(2),  setsid(2),  setsockopt(2),  set‐
       timeofday(2),  setuid(2), setuid32, setup(2), sgetmask(2), shutdown(2),
       sigaction(2), sigaltstack(2), signal(2), sigpending(2), sigprocmask(2),
       sigreturn(2),  sigsuspend(2),  socket(2), socketcall(2), socketpair(2),
       ssetmask(2), stat(2), stat64, statfs(2),	 stime(2),  stty,  swapoff(2),
       swapon(2),   symlink(2),	  sync(2),  sysfs(2),  sysinfo(2),  syslog(2),
       time(2),	  times(2),   truncate(2),   truncate64,   ulimit,   umask(2),
       umount(2),   uname(2),	unlink(2),   uselib(2),	  ustat(2),  utime(2),
       vfork(2), vhangup(2), vm86(2), vm86old, wait4(2), waitpid(2), write(2),
       writev(2).

       Of  the	above,	9  are obsolete, namely getrlimit, oldfstat, oldlstat,
       oldolduname, oldstat, olduname, readdir, select and vm86old  (see  also
       obsolete(2)),  and  15 are unimplemented in the standard kernel, namely
       afs_syscall, break, ftime, getpmsg, gtty, idle, lock, mpx, phys,	 prof,
       profil, putpmsg, security, stty and ulimit (see also unimplemented(2)).
       However, ftime(3), profil(3) and ulimit(3) exist as  library  routines.
       The  slot  for phys is in use since 2.1.116 for umount; phys will never
       be implemented. The getpmsg and putpmsg calls are for  kernels  patched
       to  support streams, and may never be in the standard kernel. The secu‐
       rity call is for future use.

       Roughly speaking, the code belonging to the  system  call  with	number
       __NR_xxx	 defined in /usr/include/asm/unistd.h can be found in the ker‐
       nel source in the routine sys_xxx().  (The dispatch table for i386  can
       be  found  in /usr/src/linux/arch/i386/kernel/entry.S.)	There are many
       exceptions, however, mostly because older system calls were  superseded
       by  newer ones, and this has been treated somewhat unsystematically. On
       platforms with proprietary OS emulation, such as parisc, sparc, sparc64
       and alpha, there are many additional system calls; mips64 also contains
       a full set of 32-bit system calls.  Below the details for Linux 2.4.17.

       The defines __NR_oldstat and __NR_stat refer to the routines sys_stat()
       and  sys_newstat(),  and similarly for fstat and lstat.	Similarly, the
       defines __NR_oldolduname, __NR_olduname and  __NR_uname	refer  to  the
       routines	  sys_olduname(),   sys_uname()	  and  sys_newuname().	 Thus,
       __NR_stat and __NR_uname have always referred to the latest version  of
       the system call, and the older ones are for backward compatibility.

       It  is  different with select and mmap.	These use five or more parame‐
       ters, and caused problems the way parameter passing on the i386 used to
       be  set	up.  Thus,  while  other  architectures	 have sys_select() and
       sys_mmap() corresponding to __NR_select	and  __NR_mmap,	 on  i386  one
       finds  old_select()  and	 old_mmap()  (routines that use a pointer to a
       parameter block) instead. These days passing five parameters is	not  a
       problem	any more, and there is a __NR__newselect (used by libc 6) that
       corresponds directly to sys_select() and similarly __NR_mmap2.

       Two other system call numbers, __NR__llseek and	__NR__sysctl  have  an
       additional underscore absent in sys_llseek() and sys_sysctl().

       Then  there  is __NR_readdir corresponding to old_readdir(), which will
       read at most one directory entry	 at  a	time,  and  is	superseded  by
       sys_getdents().

       On  many	 platforms,  including	i386, socket calls are all multiplexed
       through socketcall() and System V IPC calls through ipc().

       On newer platforms that only have 64-bit file access  and  32-bit  uids
       (e.g.  alpha, ia64, s390x) there are no *64 or *32 calls. Where the *64
       and *32 calls exist, the other versions are obsolete.

       The chown and lchown system calls were swapped in 2.1.81. The  *64  and
       *32  calls were added for kernel 2.4, as were the new versions of getr‐
       limit and mmap, and the new calls pivot_root, mincore,  madvise,	 secu‐
       rity, gettid and readahead.

Linux 2.4			  2002-01-07			   SYSCALLS(2)
[top]

List of man pages available for CentOS

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net