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build-sys: Add setns() functions if not in the C library.

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Debian Stable is still using glibc 2.13, which doesn't provide the setns().
So we detect this and provide a tiny wrapper that issues the setns syscall
towards the kernel.
This commit is contained in:
Holger Schurig 2014-02-20 14:39:13 +01:00 committed by Lennart Poettering
parent d9d93745cd
commit 3b79431414
Notes: Zbigniew Jędrzejewski-Szmek 2014-02-27 19:00:13 -05:00 
Backport: bugfix
2 changed files with 20 additions and 2 deletions
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5
configure.ac
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@ -241,10 +241,11 @@ LIBS="$save_LIBS"
AC_CHECK_FUNCS([fanotify_init fanotify_mark])
AC_CHECK_FUNCS([__secure_getenv secure_getenv])
AC_CHECK_DECLS([gettid, pivot_root, name_to_handle_at], [], [], [[#include <sys/types.h>
AC_CHECK_DECLS([gettid, pivot_root, name_to_handle_at, setns], [], [], [[#include <sys/types.h>
#include <unistd.h>
#include <sys/mount.h>
#include <fcntl.h>]])
#include <fcntl.h>
#include <sched.h>]])
# This makes sure pkg.m4 is available.
m4_pattern_forbid([^_?PKG_[A-Z_]+$],[*** pkg.m4 missing, please install pkg-config])

17
src/shared/missing.h
View File

@ -28,6 +28,7 @@
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <linux/oom.h>
#include <linux/input.h>
#include <linux/if_link.h>
@ -353,3 +354,19 @@ static inline int name_to_handle_at(int fd, const char *name, struct file_handle
#endif
#endif
#ifndef __NR_setns
# if defined(__x86_64__)
# define __NR_setns 308
# elif defined(__i386__)
# define __NR_setns 346
# else
# error "__NR_setns is not defined"
# endif
#endif
#if !HAVE_DECL_SETNS
static inline int setns(int fd, int nstype) {
return syscall(__NR_setns, fd, nstype);
}
#endif