syscall(2) [osx man page]

SYSCALL(2)						      BSD System Calls Manual							SYSCALL(2)

NAME

     syscall -- indirect system call

SYNOPSIS

     #include <sys/syscall.h>
     #include <unistd.h>

     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>.  This function is useful for testing new system calls that do not
     have entries in the C library.

RETURN VALUES

     The return values are 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.

BUGS

     There is no way to simulate system calls that have multiple return values such as pipe(2).

HISTORY

     The syscall() function call appeared in 4.0BSD.

4th Berkeley Distribution					   June 23, 2008					 4th Berkeley Distribution

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)