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lxc: ensure setns() syscall is defined

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Older versions of glibc don't provide the setns() syscall
function wrapper, so we must define it ourselves to prevent
build failure on old distros.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrange 2015-08-26 15:52:15 +01:00
parent 3418e7815a
commit eff95ac8fc
1 changed files with 34 additions and 0 deletions
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34
src/lxc/lxc_container.c
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@ -95,6 +95,40 @@ VIR_LOG_INIT("lxc.lxc_container");
# define CLONE_NEWNET 0x40000000 /* New network namespace */
#endif
/*
* Workaround older glibc. While kernel may support the setns
* syscall, the glibc wrapper might not exist. If that's the
* case, use our own.
*/
#ifndef __NR_setns
# if defined(__x86_64__)
# define __NR_setns 308
# elif defined(__i386__)
# define __NR_setns 346
# elif defined(__arm__)
# define __NR_setns 375
# elif defined(__aarch64__)
# define __NR_setns 375
# elif defined(__powerpc__)
# define __NR_setns 350
# elif defined(__s390__)
# define __NR_setns 339
# endif
#endif
#ifndef HAVE_SETNS
# if defined(__NR_setns)
# include <sys/syscall.h>
static inline int setns(int fd, int nstype)
{
return syscall(__NR_setns, fd, nstype);
}
# else /* !__NR_setns */
# error Please determine the syscall number for setns on your architecture
# endif
#endif
/* messages between parent and container */
typedef char lxc_message_t;
#define LXC_CONTINUE_MSG 'c'