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util: add a function for executing an extrenal tools (v2)

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For executing an external tools we need to block a SIGCHLD
and to juggle file descriptors.

SIGCHLD is blocked for getting an exit code.

A problem with file descriptors can be if we want to set 2 to STDIN,
1 to STDERR, 0 to STDOUT for example.

v2: use helpers reopen_fd_as and move_img_fd

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Andrey Vagin
2012-09-28 14:09:57 +04:00
committed by Pavel Emelyanov
parent af02c2698f
commit cd2be93ba4
2 changed files with 108 additions and 0 deletions
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include/util.h
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@@ -325,4 +325,6 @@ extern void *shmalloc(size_t bytes);
extern void shfree_last(void *ptr);
extern int run_scripts(char *action);
extern int cr_system(int in, int out, int err, char *cmd, char *const argv[]);
#endif /* UTIL_H_ */