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author | jilles <jilles@FreeBSD.org> | 2013-08-16 13:16:27 +0000 |
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committer | jilles <jilles@FreeBSD.org> | 2013-08-16 13:16:27 +0000 |
commit | 1c4bb0bb4820abf63b0844f9d634f89834d3a373 (patch) | |
tree | 69c80e87f95bdc5a85cd90c4e76c591d87589761 /lib/libc/gen | |
parent | 020684e443a1f78e36f1eaa4db5c133150e2f026 (diff) | |
download | FreeBSD-src-1c4bb0bb4820abf63b0844f9d634f89834d3a373.zip FreeBSD-src-1c4bb0bb4820abf63b0844f9d634f89834d3a373.tar.gz |
Add man page dup3(3).
Diffstat (limited to 'lib/libc/gen')
-rw-r--r-- | lib/libc/gen/Makefile.inc | 1 | ||||
-rw-r--r-- | lib/libc/gen/dup3.3 | 120 |
2 files changed, 121 insertions, 0 deletions
diff --git a/lib/libc/gen/Makefile.inc b/lib/libc/gen/Makefile.inc index ce9a430..a88150c 100644 --- a/lib/libc/gen/Makefile.inc +++ b/lib/libc/gen/Makefile.inc @@ -185,6 +185,7 @@ MAN+= alarm.3 \ dlinfo.3 \ dllockinit.3 \ dlopen.3 \ + dup3.3 \ err.3 \ exec.3 \ feature_present.3 \ diff --git a/lib/libc/gen/dup3.3 b/lib/libc/gen/dup3.3 new file mode 100644 index 0000000..5b290c2 --- /dev/null +++ b/lib/libc/gen/dup3.3 @@ -0,0 +1,120 @@ +.\" 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. +.\" 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. +.\" +.\" @(#)dup.2 8.1 (Berkeley) 6/4/93 +.\" $FreeBSD$ +.\" +.Dd August 16, 2013 +.Dt DUP3 3 +.Os +.Sh NAME +.Nm dup3 +.Nd duplicate an existing file descriptor +.Sh LIBRARY +.Lb libc +.Sh SYNOPSIS +.In fcntl.h +.In unistd.h +.Ft int +.Fn dup3 "int oldd" "int newd" "int flags" +.Sh DESCRIPTION +The +.Fn dup3 +function +duplicates an existing object descriptor +while allowing the value of the new descriptor to be specified. +.Pp +The close-on-exec flag on the new file descriptor is determined by the +.Dv O_CLOEXEC +bit in +.Fa flags . +.Pp +If +.Fa oldd +\*(Ne +.Fa newd +and +.Fa flags +== 0, +the behavior is identical to +.Li dup2(oldd, newd) . +.Pp +If +.Fa oldd +== +.Fa newd , +then +.Fn dup3 +fails, unlike +.Xr dup2 2 . +.Sh RETURN VALUES +The value -1 is returned if an error occurs. +The external variable +.Va errno +indicates the cause of the error. +.Sh ERRORS +The +.Fn dup3 +function fails if: +.Bl -tag -width Er +.It Bq Er EBADF +The +.Fa oldd +argument is not a valid active descriptor or the +.Fa newd +argument is negative or exceeds the maximum allowable descriptor number +.It Bq Er EINVAL +The +.Fa oldd +argument is equal to the +.Fa newd +argument. +.It Bq Er EINVAL +The +.Fa flags +argument has bits set other than +.Dv O_CLOEXEC . +.El +.Sh SEE ALSO +.Xr accept 2 , +.Xr close 2 , +.Xr dup2 2 , +.Xr fcntl 2 , +.Xr getdtablesize 2 , +.Xr open 2 , +.Xr pipe 2 , +.Xr socket 2 , +.Xr socketpair 2 +.Sh STANDARDS +The +.Fn dup3 +function does not conform to any standard. +.Sh HISTORY +The +.Fn dup3 +function appeared in +.Fx 10.0 . |