SYSCALL(2) Linux Programmer's Manual SYSCALL(2)NAMEsyscall - 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, ...);
DESCRIPTIONsyscall() 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 gen‐
eral, a 0 return value indicates success. A -1 return value indicates
an error, and an error code is stored in errno.
NOTESsyscall() 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
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Linux 2007-07-26 SYSCALL(2)