1.\" Copyright (c) 1980, 1991 Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" from: @(#)syscall.2 6.3 (Berkeley) 3/10/91 33.\" $Id: syscall.2,v 1.3 1993/11/25 00:39:55 jtc Exp $ 34.\" 35.Dd March 10, 1991 36.Dt SYSCALL 2 37.Os BSD 4 38.Sh NAME 39.Nm syscall 40.Nd indirect system call 41.Sh SYNOPSIS 42.Fd #include <unistd.h> 43.Fd #include <sys/syscall.h> 44.Ft int 45.Fn syscall "int number" "..." 46.Sh DESCRIPTION 47.Fn Syscall 48performs the system call whose assembly language 49interface has the specified 50.Fa number 51with the specified arguments. 52Symbolic constants for system calls can be found in the header file 53.Ao Pa syscall.h Ac . 54.Pp 55.Sh RETURN VALUES 56The r0 value of the system call is returned. 57When the C-bit is set, 58.Fn syscall 59returns -1 and sets the 60external variable 61.Va errno 62(see 63.Xr intro 2 ) . 64.Sh BUGS 65There is no way to simulate system calls 66such as 67.Xr pipe 2 . 68.Sh HISTORY 69The 70.Fn syscall 71function call appeared in 72.Bx 4.0 . 73