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libbb: make BB_EXECVP/LP try to exec real binary if there's no /proc/self/exe

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2011-02-02 03:28:56 +01:00
parent 099e528919
commit c71b469f5d
3 changed files with 18 additions and 16 deletions
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12
include/libbb.h
View File

@ -867,14 +867,16 @@ int exists_execable(const char *filename) FAST_FUNC;
* but it may exec busybox and call applet instead of searching PATH.
*/
#if ENABLE_FEATURE_PREFER_APPLETS
int bb_execvp(const char *file, char *const argv[]) FAST_FUNC;
#define BB_EXECVP(prog,cmd) bb_execvp(prog,cmd)
int BB_EXECVP(const char *file, char *const argv[]) FAST_FUNC;
#define BB_EXECLP(prog,cmd,...) \
execlp((find_applet_by_name(prog) >= 0) ? CONFIG_BUSYBOX_EXEC_PATH : prog, \
cmd, __VA_ARGS__)
do { \
if (find_applet_by_name(prog) >= 0) \
execlp(bb_busybox_exec_path, cmd, __VA_ARGS__); \
execlp(prog, cmd, __VA_ARGS__); \
} while (0)
#else
#define BB_EXECVP(prog,cmd) execvp(prog,cmd)
#define BB_EXECLP(prog,cmd,...) execlp(prog,cmd, __VA_ARGS__)
#define BB_EXECLP(prog,cmd,...) execlp(prog,cmd,__VA_ARGS__)
#endif
int BB_EXECVP_or_die(char **argv) NORETURN FAST_FUNC;

10
libbb/execable.c
View File

@ -68,12 +68,12 @@ int FAST_FUNC exists_execable(const char *filename)
}
#if ENABLE_FEATURE_PREFER_APPLETS
/* just like the real execvp, but try to launch an applet named 'file' first
*/
int FAST_FUNC bb_execvp(const char *file, char *const argv[])
/* just like the real execvp, but try to launch an applet named 'file' first */
int FAST_FUNC BB_EXECVP(const char *file, char *const argv[])
{
return execvp(find_applet_by_name(file) >= 0 ? bb_busybox_exec_path : file,
argv);
if (find_applet_by_name(file) >= 0)
execvp(bb_busybox_exec_path, argv);
return execvp(file, argv);
}
#endif

12
libbb/vfork_daemon_rexec.c
View File

@ -182,17 +182,17 @@ int FAST_FUNC spawn_and_wait(char **argv)
int a = find_applet_by_name(argv[0]);
if (a >= 0 && (APPLET_IS_NOFORK(a)
#if BB_MMU
# if BB_MMU
|| APPLET_IS_NOEXEC(a) /* NOEXEC trick needs fork() */
#endif
# endif
)) {
#if BB_MMU
# if BB_MMU
if (APPLET_IS_NOFORK(a))
#endif
# endif
{
return run_nofork_applet(a, argv);
}
#if BB_MMU
# if BB_MMU
/* MMU only */
/* a->noexec is true */
rc = fork();
@ -201,7 +201,7 @@ int FAST_FUNC spawn_and_wait(char **argv)
/* child */
xfunc_error_retval = EXIT_FAILURE;
run_applet_no_and_exit(a, argv);
#endif
# endif
}
#endif /* FEATURE_PREFER_APPLETS */
rc = spawn(argv);