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41 lines
1.4 KiB
Diff
41 lines
1.4 KiB
Diff
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http://bugs.gentoo.org/250342
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http://sources.redhat.com/bugzilla/show_bug.cgi?id=9685
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we cant assume sock_cloexec and pipe2 are bound together as the former defines
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are found in glibc only while the latter are a combo of kernel headers and
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glibc. so if we do a runtime detection of SOCK_CLOEXEC, but pipe2() is a stub
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inside of glibc, we hit a problem. for example:
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#include <grp.h>
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#include <stdio.h>
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main()
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{
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getgrnam("portage");
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if (!popen("ls", "r"))
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perror("popen()");
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}
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getgrnam() will detect that the kernel supports SOCK_CLOEXEC and then set both
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__have_sock_cloexec and __have_pipe2 to true. but if glibc was built against
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older kernel headers where __NR_pipe2 does not exist, glibc will have a ENOSYS
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stub for it. so popen() will always fail as glibc assumes pipe2() works.
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diff -durN glibc-2.12.1.orig/socket/have_sock_cloexec.c glibc-2.12.1/socket/have_sock_cloexec.c
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--- glibc-2.12.1.orig/socket/have_sock_cloexec.c 2008-07-25 18:46:23.000000000 +0200
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+++ glibc-2.12.1/socket/have_sock_cloexec.c 2009-11-13 00:50:15.000000000 +0100
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@@ -16,9 +16,14 @@
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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+#include <fcntl.h>
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#include <sys/socket.h>
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#include <kernel-features.h>
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#if defined SOCK_CLOEXEC && !defined __ASSUME_SOCK_CLOEXEC
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int __have_sock_cloexec;
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#endif
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+
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+#if defined O_CLOEXEC && !defined __ASSUME_PIPE2
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+int __have_pipe2;
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+#endif
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