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Add dup3(), based on F_DUP2FD and F_DUP2FD_CLOEXEC fcntls.

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I removed functionality not proposed for POSIX in Austin group issue #411.
A man page (my own) and test cases will follow in later commits.

PR:		176233
Submitted by:	Jukka Ukkonen
This commit is contained in:
jilles 2013-08-16 13:10:30 +00:00
parent 5e5b39c47e
commit 020684e443
4 changed files with 62 additions and 0 deletions
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1
include/unistd.h
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@ -493,6 +493,7 @@ const char *
int crypt_set_format(const char *);
int des_cipher(const char *, char *, long, int);
int des_setkey(const char *key);
int dup3(int, int, int);
int eaccess(const char *, int);
void endusershell(void);
int exect(const char *, char * const *, char * const *);

1
lib/libc/gen/Makefile.inc
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@ -31,6 +31,7 @@ SRCS+= __getosreldate.c \
disklabel.c \
dlfcn.c \
drand48.c \
dup3.c \
elf_utils.c \
erand48.c \
err.c \

1
lib/libc/gen/Symbol.map
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@ -383,6 +383,7 @@ FBSD_1.2 {
FBSD_1.3 {
clock_getcpuclockid;
dirfd;
dup3;
fdlopen;
__FreeBSD_libc_enter_restricted_mode;
getcontextx;

59
lib/libc/gen/dup3.c Normal file
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@ -0,0 +1,59 @@
/*-
* Copyright (c) 2012 Jukka A. Ukkonen
* All rights reserved.
*
* This software was developed by Jukka Ukkonen for FreeBSD.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "namespace.h"
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include "un-namespace.h"
int
__dup3(int oldfd, int newfd, int flags)
{
int how;
if (oldfd == newfd) {
errno = EINVAL;
return (-1);
}
if (flags & ~O_CLOEXEC) {
errno = EINVAL;
return (-1);
}
how = (flags & O_CLOEXEC) ? F_DUP2FD_CLOEXEC : F_DUP2FD;
return (_fcntl(oldfd, how, newfd));
}
__weak_reference(__dup3, dup3);
__weak_reference(__dup3, _dup3);