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| author | Holger Schurig <holgerschurig@gmail.com> | 2014-02-20 14:39:13 +0100 |
|---|---|---|
| committer | Lennart Poettering <lennart@poettering.net> | 2014-02-21 03:06:29 +0100 |
| commit | 3b794314149e40afaf3c456285e1e529747b6560 (patch) | |
| tree | 90c1b0327fc514c8a56a41292772a427ddf7aea4 | |
| parent | d9d93745cd2efcdfca8f82d798e61e0ee70cef5c (diff) | |
build-sys: Add setns() functions if not in the C library.
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.
| -rw-r--r-- | configure.ac | 5 | ||||
| -rw-r--r-- | src/shared/missing.h | 17 |
2 files changed, 20 insertions, 2 deletions
diff --git a/configure.ac b/configure.ac index 05ee098d2..18df6d86e 100644 --- a/configure.ac +++ b/configure.ac @@ -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]) diff --git a/src/shared/missing.h b/src/shared/missing.h index 2661285a2..3142306e3 100644 --- a/src/shared/missing.h +++ b/src/shared/missing.h @@ -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 |