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Annotation of 43BSDReno/lib/libc/sys/syscall.2, revision 1.1.1.1

1.1       root        1: .\" Copyright (c) 1980 Regents of the University of California.
                      2: .\" All rights reserved.  The Berkeley software License Agreement
                      3: .\" specifies the terms and conditions for redistribution.
                      4: .\"
                      5: .\"    @(#)syscall.2   6.2 (Berkeley) 4/16/86
                      6: .\"
                      7: .TH SYSCALL 2 "April 16, 1986"
                      8: .UC 4
                      9: .SH NAME
                     10: syscall \- indirect system call
                     11: .SH SYNOPSIS
                     12: .nf
                     13: .ft B
                     14: #include <syscall.h>
                     15: .PP
                     16: .BR "syscall(number, arg, ...)" \  \  (VAX-11)
                     17: .fi
                     18: .SH DESCRIPTION
                     19: .I Syscall
                     20: performs the system call whose assembly language
                     21: interface has the specified
                     22: .I number,
                     23: register arguments
                     24: .I r0
                     25: and
                     26: .I r1
                     27: and further arguments
                     28: .IR arg .
                     29: Symbolic constants for system calls can be found in the header file
                     30: .I <syscall.h>.
                     31: .PP
                     32: The r0 value of the system call is returned.
                     33: .SH DIAGNOSTICS
                     34: When the C-bit is set,
                     35: .I syscall
                     36: returns \-1 and sets the
                     37: external variable 
                     38: .I errno
                     39: (see
                     40: .IR intro (2)).
                     41: .SH BUGS
                     42: There is no way to simulate system calls
                     43: such as
                     44: .IR pipe (2),
                     45: which return values in register r1.

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