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author | rgrimes <rgrimes@FreeBSD.org> | 1994-05-27 05:00:24 +0000 |
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committer | rgrimes <rgrimes@FreeBSD.org> | 1994-05-27 05:00:24 +0000 |
commit | be22b15ae2ff8d7fe06b6e14fddf0c5b444a95da (patch) | |
tree | a18a706dffa5baf86a3b12bbfb4f81caa097f349 /lib/libc/sys/syscall.2 | |
parent | 2a27bd86e6002c871e3b5561a5334653bb222a77 (diff) | |
download | FreeBSD-src-be22b15ae2ff8d7fe06b6e14fddf0c5b444a95da.zip FreeBSD-src-be22b15ae2ff8d7fe06b6e14fddf0c5b444a95da.tar.gz |
BSD 4.4 Lite Lib Sources
Diffstat (limited to 'lib/libc/sys/syscall.2')
-rw-r--r-- | lib/libc/sys/syscall.2 | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/lib/libc/sys/syscall.2 b/lib/libc/sys/syscall.2 new file mode 100644 index 0000000..2e020ad --- /dev/null +++ b/lib/libc/sys/syscall.2 @@ -0,0 +1,76 @@ +.\" Copyright (c) 1980, 1991, 1993 +.\" The Regents of the University of California. All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" 3. All advertising materials mentioning features or use of this software +.\" must display the following acknowledgement: +.\" This product includes software developed by the University of +.\" California, Berkeley and its contributors. +.\" 4. Neither the name of the University nor the names of its contributors +.\" may be used to endorse or promote products derived from this software +.\" without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" @(#)syscall.2 8.1 (Berkeley) 6/16/93 +.\" +.Dd June 16, 1993 +.Dt SYSCALL 2 +.Os BSD 4 +.Sh NAME +.Nm syscall , +.Nm __syscall +.Nd indirect system call +.Sh SYNOPSIS +.Fd #include <sys/syscall.h> +.Fd #include <unistd.h> +.Ft int +.Fn syscall "int number" "..." +.Ft int +.Fn __syscall "quad_t number" "..." +.Sh DESCRIPTION +.Fn Syscall +performs the system call whose assembly language +interface has the specified +.Fa number +with the specified arguments. +Symbolic constants for system calls can be found in the header file +.Ao Pa sys/syscall.h Ac . +The +.Nm __syscall +form should be used when one or more of the parameters is a +64-bit argument to ensure that argument alignment is correct. +This system call is useful for testing new system calls that +do not have entries in the C library. +.Sh RETURN VALUES +The return values are defined by the system call being invoked. +In general, a 0 return value indicates success. +A -1 return value indicates an error, +and an error code is stored in +.Va errno . +.Sh BUGS +There is no way to simulate system calls that have multiple return values +such as +.Xr pipe 2 . +.Sh HISTORY +The +.Nm syscall +function call appeared in +.Bx 4.0 . |