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Emulate pipe2() on systems without it.

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This commit is contained in:
Todd C. Miller
2017-03-13 12:11:51 -06:00
parent b63df21ba5
commit 7aa89c49b5
8 changed files with 106 additions and 1 deletions
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2
lib/util/Makefile.in
View File

@@ -489,6 +489,8 @@ parseln_test.lo: $(srcdir)/regress/sudo_parseln/parseln_test.c \
$(incdir)/compat/stdbool.h $(incdir)/sudo_compat.h \
$(incdir)/sudo_util.h $(top_builddir)/config.h
$(LIBTOOL) $(LTFLAGS) --mode=compile $(CC) -c -o $@ $(CPPFLAGS) $(CFLAGS) $(ASAN_CFLAGS) $(PIE_CFLAGS) $(SSP_CFLAGS) $(srcdir)/regress/sudo_parseln/parseln_test.c
pipe2.lo: $(srcdir)/pipe2.c $(incdir)/sudo_compat.h $(top_builddir)/config.h
$(LIBTOOL) $(LTFLAGS) --mode=compile $(CC) -c -o $@ $(CPPFLAGS) $(CFLAGS) $(ASAN_CFLAGS) $(PIE_CFLAGS) $(SSP_CFLAGS) $(srcdir)/pipe2.c
progname.lo: $(srcdir)/progname.c $(incdir)/compat/stdbool.h \
$(incdir)/sudo_compat.h $(incdir)/sudo_util.h \
$(top_builddir)/config.h

59
lib/util/pipe2.c Normal file
View File

@@ -0,0 +1,59 @@
/*
* Copyright (c) 2017 Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <config.h>
#ifndef HAVE_PIPE2
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include "sudo_compat.h"
int
sudo_pipe2(int fildes[2], int flags)
{
if (pipe(fildes) != 0)
return -1;
if (ISSET(flags, O_NONBLOCK)) {
int flags = fcntl(fildes[0], F_GETFL, 0);
if (flags == -1)
goto bad;
if (fcntl(fildes[0], F_SETFL, flags | O_NONBLOCK) == -1)
goto bad;
flags = fcntl(fildes[1], F_GETFL, 0);
if (flags == -1)
goto bad;
if (fcntl(fildes[1], F_SETFL, flags | O_NONBLOCK) == -1)
goto bad;
}
if (ISSET(flags, O_CLOEXEC)) {
if (fcntl(fildes[0], F_SETFD, FD_CLOEXEC) == -1)
goto bad;
if (fcntl(fildes[1], F_SETFD, FD_CLOEXEC) == -1)
goto bad;
}
return 0;
bad:
close(fildes[0]);
close(fildes[1]);
return -1;
}
#endif /* HAVE_PIPE2 */