osf1 man page for syscall

syscall(2)							System Calls Manual							syscall(2)

NAME
       syscall - indirect system call

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

       syscall (number, arg, ...)

DESCRIPTION
       The  syscall system call performs the system call whose assembly language interface has the specified number, register arguments r0 and r1,
       and further arguments arg.

       The r0 value of the system call is returned.

NOTES
       This interface is not recommended. An alternative interface is documented in chown(2).

RESTRICTIONS
       There is no way to simulate system calls such as pipe, which return values in register r1.

DIAGNOSTICS
       When the C-bit is set, syscall returns -1 and sets the external variable errno.

SEE ALSO
       Functions:  errno(2), pipe(2)

																	syscall(2)