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BSD 2.11 - man page for syscall (bsd section 2)

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SYSCALL(2)									       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 num-
       ber, register arguments r0 and r1 and further arguments arg.  Symbolic constants for  sys-
       tem 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)
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