| | 1 | .\" $NetBSD: syscall.2,v 1.4 1995/02/27 12:38:53 cgd Exp $ |
| | 2 | .\" |
| | 3 | .\" Copyright (c) 1980, 1991, 1993 |
| | 4 | .\" The Regents of the University of California. All rights reserved. |
| | 5 | .\" |
| | 6 | .\" Redistribution and use in source and binary forms, with or without |
| | 7 | .\" modification, are permitted provided that the following conditions |
| | 8 | .\" are met: |
| | 9 | .\" 1. Redistributions of source code must retain the above copyright |
| | 10 | .\" notice, this list of conditions and the following disclaimer. |
| | 11 | .\" 2. Redistributions in binary form must reproduce the above copyright |
| | 12 | .\" notice, this list of conditions and the following disclaimer in the |
| | 13 | .\" documentation and/or other materials provided with the distribution. |
| | 14 | .\" 3. All advertising materials mentioning features or use of this software |
| | 15 | .\" must display the following acknowledgement: |
| | 16 | .\" This product includes software developed by the University of |
| | 17 | .\" California, Berkeley and its contributors. |
| | 18 | .\" 4. Neither the name of the University nor the names of its contributors |
| | 19 | .\" may be used to endorse or promote products derived from this software |
| | 20 | .\" without specific prior written permission. |
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| | 22 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| | 23 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| | 24 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| | 25 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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| | 32 | .\" SUCH DAMAGE. |
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| | 34 | .\" @(#)syscall.2 8.1 (Berkeley) 6/16/93 |
| | 35 | .\" |
| | 36 | .Dd June 16, 1993 |
| | 37 | .Dt SYSCALL 2 |
| | 38 | .Os BSD 4 |
| | 39 | .Sh NAME |
| | 40 | .Nm syscall , |
| | 41 | .Nm __syscall |
| | 42 | .Nd indirect system call |
| | 43 | .Sh SYNOPSIS |
| | 44 | .Fd #include <sys/syscall.h> |
| | 45 | .Fd #include <unistd.h> |
| | 46 | .Ft int |
| | 47 | .Fn syscall "int number" "..." |
| | 48 | .Ft int |
| | 49 | .Fn __syscall "quad_t number" "..." |
| | 50 | .Sh DESCRIPTION |
| | 51 | .Fn Syscall |
| | 52 | performs the system call whose assembly language |
| | 53 | interface has the specified |
| | 54 | .Fa number |
| | 55 | with the specified arguments. |
| | 56 | Symbolic constants for system calls can be found in the header file |
| | 57 | .Ao Pa sys/syscall.h Ac . |
| | 58 | The |
| | 59 | .Nm __syscall |
| | 60 | form should be used when one or more of the parameters is a |
| | 61 | 64-bit argument to ensure that argument alignment is correct. |
| | 62 | This system call is useful for testing new system calls that |
| | 63 | do not have entries in the C library. |
| | 64 | .Sh RETURN VALUES |
| | 65 | The return values are defined by the system call being invoked. |
| | 66 | In general, a 0 return value indicates success. |
| | 67 | A -1 return value indicates an error, |
| | 68 | and an error code is stored in |
| | 69 | .Va errno . |
| | 70 | .Sh BUGS |
| | 71 | There is no way to simulate system calls that have multiple return values |
| | 72 | such as |
| | 73 | .Xr pipe 2 . |
| | 74 | .Sh HISTORY |
| | 75 | The |
| | 76 | .Fn syscall |
| | 77 | function call appeared in |
| | 78 | .Bx 4.0 . |
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