Add checks for functions that may fail

notify.c

 		int e = 0;
 		unsigned int i, r;
 		char **env = calloc(32, sizeof(char *));
-		asprintf(&env[e++], "_TS=%ld"			, time(NULL));
-		asprintf(&env[e++], "_IDENT=%s"			, shared->ident);
-		asprintf(&env[e++], "_MESSAGE_ID=%s"	, shared->msg_id);
-		asprintf(&env[e++], "_MESSAGE_TEXT=%s"	, shared->text);
+		if (asprintf(&env[e++], "_TS=%ld"			, time(NULL)) < 0) exit(EXIT_FAILURE);
+		if (asprintf(&env[e++], "_IDENT=%s"			, shared->ident) < 0) exit(EXIT_FAILURE);
+		if (asprintf(&env[e++], "_MESSAGE_ID=%s"	, shared->msg_id) < 0) exit(EXIT_FAILURE);
+		if (asprintf(&env[e++], "_MESSAGE_TEXT=%s"	, shared->text) < 0) exit(EXIT_FAILURE);
 		r = strlen(shared->msg_id);
 		for (i=0; i<r; i++) {
 			if (isalpha(shared->msg_id[i]))
 			if (shared->msg_id[i] == '_')
 				shared->msg_id[i] = ' ';
 		}
-		asprintf(&env[e++], "_MESSAGE_MSG=%s"	, shared->msg_id);
+		if (asprintf(&env[e++], "_MESSAGE_MSG=%s"	, shared->msg_id) < 0) exit(EXIT_FAILURE);
 		execve(args[0], args, env);
 		// We reach here only if there is an error.
 		fprintf(stderr, "execve('%s') failed: %s!\n", args[0], strerror(errno));

process.c

 	if (ts->no_output_on_error && !ts->camd.key->is_valid_cw)
 		return;
 	if (!ts->rtp_output) {
-		write(ts->output.fd, data, data_size);
+		if (write(ts->output.fd, data, data_size) < 0) {
+			perror("write(output_fd)");
+			return;
+		}
 	} else {
 		struct iovec iov[2];
 		uint8_t rtp_header[12];
 		iov[1].iov_base = data;
 		iov[1].iov_len  = data_size;
 
-		writev(ts->output.fd, iov, 2);
+		if (writev(ts->output.fd, iov, 2) < 0) {
+			perror("writev(output_fd)");
+			return;
+		}
 	}
 }