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syscall(2) [linux man page]

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 specified number with the specified arguments. Symbolic con- stants 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 3.27 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)

Check Out this Related Man Page

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 specified number with the specified arguments. Symbolic con- stants 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 3.25 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)

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