SYSCALL(2)SYSCALL(2)NAMEsyscall - indirect system call
SYNOPSIS
#include <syscall.h>
syscall(number, arg, ...)
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.
4th Berkeley Distribution April 16, 1986 SYSCALL(2)