2.11BSD#431 - /usr/man/cat2/syscall.0

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


NAME
     syscall - indirect system call

SYNOPSIS
     #include <syscall.h>

     syscall(number, arg, ...)	(VAX-11)

DESCRIPTION
     Syscall performs the system call whose assembly language
     interface has the specified number, register arguments r0
     and r1 and further arguments arg.	Symbolic constants for
     system calls can be found in the header file <syscall.h>.

     The r0 value of the system call is returned.

DIAGNOSTICS
     When the C-bit is set, syscall returns -1 and sets the
     external variable errno (see intro(2)).

BUGS
     There is no way to simulate system calls such as pipe(2),
     which return values in register r1.


Printed 11/26/99	 April 16, 1986                         1