[proc,include_shell] log error if exec shell fails (fixes #2280)

git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-1.4.x@2793 152afb58-edef-0310-8abb-c4023f1b3aa9

NEWS

@@ -13,6 +13,7 @@ NEWS
          load all algorithms (fixes #2239)
   * [ssl/md5] prefix our own md5 implementation with li_ so it doesn't conflict with the openssl one (fixes #2269)
   * [ssl/build] some minor fixes; fix compile without ssl, cleanup ssl config buffers
+  * [proc,include_shell] log error if exec shell fails (fixes #2280)
 
 - 1.4.28 - 2010-08-22
   * Rename fdevent_event_add to _set to reflect what the function does. Fix some handlers. (fixes #2249)

src/proc_open.c

@@ -3,6 +3,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <ctype.h>
+#include <string.h>
 #include <errno.h>
 
 #ifdef WIN32
@@ -257,6 +258,7 @@ int proc_open(proc_handler_t *proc, const char *command) {
 		proc_close_parents(proc);
 
 		execl(shell, shell, "-c", command, (char *)NULL);
+		fprintf(stderr, "failed to execute shell: %s -c %s: %s\n", shell, command, strerror(errno));
 		_exit(127);
 
 	} else if (child < 0) {