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



NAME
       syscall - indirect system call

SYNOPSIS
       #define _GNU_SOURCE        /* or _BSD_SOURCE or _SVID_SOURCE */
       #include <unistd.h>
       #include <sys/syscall.h>   /* For SYS_xxx definitions */

       int syscall(int number, ...);

DESCRIPTION
       syscall() performs the system call whose assembly language interface has the speci-
       fied number with the specified arguments.  Symbolic constants for system calls  can
       be found in the header file <sys/syscall.h>.

RETURN VALUE
       The  return  value  is  defined  by the system call being invoked.  In general, 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 <unistd.h>
       #include <sys/syscall.h>
       #include <sys/types.h>

       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 3.22 of the Linux man-pages project.  A description of
       the project, and information about reporting bugs, can be found at  http://www.ker-
       nel.org/doc/man-pages/.



Linux                             2007-07-26                        SYSCALL(2)

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