Merged revisions 114195 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

........
r114195 | tilghman | 2008-04-17 07:56:38 -0500 (Thu, 17 Apr 2008) | 8 lines

Add special case for when the agi cannot be executed, to comply with the documentation that
we return failure in that case.
(closes issue #12462)
 Reported by: fmueller
 Patches: 
       20080416__bug12462.diff.txt uploaded by Corydon76 (license 14)
 Tested by: fmueller

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@114196 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_agi.c

@@ -693,6 +693,8 @@ static enum agi_result launch_script(struct ast_channel *chan, char *script, cha
 		execv(script, argv);
 		/* Can't use ast_log since FD's are closed */
 		ast_child_verbose(1, "Failed to execute '%s': %s", script, strerror(errno));
+		/* Special case to set status of AGI to failure */
+		fprintf(stdout, "failure\n");
 		fflush(stdout);
 		_exit(1);
 	}
@@ -2646,6 +2648,12 @@ static enum agi_result run_agi(struct ast_channel *chan, char *request, AGI *agi
 				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;