esl: Don't abort the esl_listen() loop(s) if accept() returns with errno == EINTR

ivrd doesn't use sigaction + SA_RESTART for SIGCHILD. An exiting
child process will interrupt accept() in the parent to handle
the signal, which makes accept() return -1 (errno = EINTR) after
the sighandler function returns.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

libs/esl/src/esl.c

@@ -696,7 +696,7 @@ ESL_DECLARE(esl_status_t) esl_listen(const char *host, esl_port_t port, esl_list
 
 		clntLen = sizeof(echoClntAddr);
     
-		if ((client_sock = accept(server_sock, (struct sockaddr *) &echoClntAddr, &clntLen)) == ESL_SOCK_INVALID) {
+		if ((client_sock = accept(server_sock, (struct sockaddr *) &echoClntAddr, &clntLen)) == ESL_SOCK_INVALID && errno != EINTR) {
 			status = ESL_FAIL;
 			goto end;
 		}
@@ -754,7 +754,7 @@ ESL_DECLARE(esl_status_t) esl_listen_threaded(const char *host, esl_port_t port,
 
 		clntLen = sizeof(echoClntAddr);
     
-		if ((client_sock = accept(server_sock, (struct sockaddr *) &echoClntAddr, &clntLen)) == ESL_SOCK_INVALID) {
+		if ((client_sock = accept(server_sock, (struct sockaddr *) &echoClntAddr, &clntLen)) == ESL_SOCK_INVALID && errno != EINTR) {
 			status = ESL_FAIL;
 			goto end;
 		}