NAME

syscall − indirect system call

SYNOPSIS

#include <sys/syscall.h>

int syscall(number, arg, ...)

DESCRIPTION

syscall() performs the system call whose assembly language interface has the specified number, and arguments arg .... Symbolic constants for system calls can be found in the header file <sys/syscall.h>. 

On Sun-2, Sun-3, and Sun-4 systems, the value of register d0 after the system call is returned.  On Sun386i systems, the value of register %eax is returned. 

RETURN VALUE

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

SEE ALSO

intro(2), pipe(2)

BUGS

There is no way to simulate system calls such as pipe(2), which return values in register d1 on Sun-2, Sun-3, and Sun-4 systems or in register %edx on Sun386i systems. 

Sun Release 4.0  —  Last change: 22 March 1989