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ash: in standalone mode, search in $PATH if /proc/self/exe doesn't exist

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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1 parent 3365e9f commit 83f103b30e41ab038e45661df97625f655abe491 Denys Vlasenko committed Dec 20, 2011
Showing with 9 additions and 3 deletions.
  1. +9 −3 shell/ash.c
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12 shell/ash.c
@@ -7471,9 +7471,7 @@ shellexec(char **argv, const char *path, int idx)
int e;
char **envp;
int exerrno;
-#if ENABLE_FEATURE_SH_STANDALONE
- int applet_no = -1;
-#endif
+ int applet_no = -1; /* used only by FEATURE_SH_STANDALONE */
clearredir(/*drop:*/ 1);
envp = listvars(VEXPORT, VUNSET, /*end:*/ NULL);
@@ -7483,8 +7481,16 @@ shellexec(char **argv, const char *path, int idx)
#endif
) {
tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp);
+ if (applet_no >= 0) {
+ /* We tried execing ourself, but it didn't work.
+ * Maybe /proc/self/exe doesn't exist?
+ * Try $PATH search.
+ */
+ goto try_PATH;
+ }
e = errno;
} else {
+ try_PATH:
e = ENOENT;
while ((cmdname = path_advance(&path, argv[0])) != NULL) {
if (--idx < 0 && pathopt == NULL) {

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