SYSCALL(2)		   Linux Programmers Manual		   SYSCALL(2)



NAME
       syscall - indirect system call

SYNOPSIS
       #define _GNU_SOURCE	  /* or _BSD_SOURCE or _SVID_SOURCE */
       #include 
       #include    /* For SYS_xxx definitions */

       int syscall(int number, ...);

DESCRIPTION
       syscall()  performs  the  system call whose assembly language interface
       has the specified number with the specified arguments.	Symbolic  con
       stants	for   system   calls   can   be   found  in  the  header  file
       .

RETURN VALUE
       The return value is defined by the system call being invoked.  In  gen
       eral,  a 0 return value indicates success.  A -1 return value indicates
       an error, and an error code is stored in errno.

NOTES
       syscall() first appeared in 4BSD.

EXAMPLE
       #define _GNU_SOURCE
       #include 
       #include 
       #include 

       int
       main(int argc, char *argv[])
       {
	   pid_t tid;

	   tid = syscall(SYS_gettid);
       }

SEE ALSO
       _syscall(2), intro(2), syscalls(2)

COLOPHON
       This page is part of release 3.05 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.



Linux				  2007-07-26			    SYSCALL(2)