Index: res/res_agi.c
===================================================================
--- res/res_agi.c	(revision 114177)
+++ res/res_agi.c	(working copy)
@@ -346,6 +346,8 @@
 		execv(script, argv);
 		/* Can't use ast_log since FD's are closed */
 		fprintf(stdout, "verbose \"Failed to execute '%s': %s\" 2\n", script, strerror(errno));
+		/* Special case to set status of AGI to failure */
+		fprintf(stdout, "failure\n");
 		fflush(stdout);
 		_exit(1);
 	}
@@ -1904,6 +1906,12 @@
 				break;
 			}
 
+			/* Special case for inability to execute child process */
+			if (*buf && strncasecmp(buf, "failure", 7) == 0) {
+				returnstatus = AGI_RESULT_FAILURE;
+				break;
+			}
+
 			/* get rid of trailing newline, if any */
 			if (*buf && buf[strlen(buf) - 1] == '\n')
 				buf[strlen(buf) - 1] = 0;