</p>Download this video: Ogg Theora]
Open source is answering the call at government agencies on all levels as they look for opportunities to carve out costs and improve security, transparency, public participation, and collaboration. Why? Open source is stable, trustworthy, and secure,... (0 Replies)
Hello,
I'm a spankin' newbie on Unix.
I've always wanted to learn Unix ever since I saw HPUX in a CAM station of a manufacturing company, but people have been telling me that there's no future in Unix.
They say that only governments are using it, and internet related companies still use them... (1 Reply)
SYSCALL(2) Linux Programmer's Manual SYSCALL(2)NAME
syscall - indirect system call
SYNOPSIS
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <unistd.h>
#include <sys/syscall.h> /* For SYS_xxx definitions */
int syscall(int number, ...);
DESCRIPTION
syscall() is a small library function that invokes the system call whose assembly language interface has the specified number with the
specified arguments. Employing syscall() is useful, for example, when invoking a system call that has no wrapper function in the C
library.
syscall() saves CPU registers before making the system call, restores the registers upon return from the system call, and stores any error
code returned by the system call in errno(3) if an error occurs.
Symbolic constants for system call numbers 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);
tid = syscall(SYS_tgkill, getpid(), tid);
}
SEE ALSO _syscall(2), intro(2), syscalls(2)COLOPHON
This page is part of release 3.44 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 2012-08-14 SYSCALL(2)
