X-Git-Url: https://git.distorted.org.uk/~mdw/sgt/putty/blobdiff_plain/42af6a672d16302ee1b8971a7cc164120f7572ab..219fc52343882cf5fe9170909bb6cc8b13716f00:/unix/uxplink.c

diff --git a/unix/uxplink.c b/unix/uxplink.c
index 6d9a9b75..55d1663d 100644
--- a/unix/uxplink.c
+++ b/unix/uxplink.c
@@ -513,7 +513,8 @@ int signalpipe[2];
 
 void sigwinch(int signum)
 {
-    write(signalpipe[1], "x", 1);
+    if (write(signalpipe[1], "x", 1) <= 0)
+	/* not much we can do about it */;
 }
 
 /*
@@ -537,7 +538,7 @@ static void usage(void)
     printf("  -pgpfp    print PGP key fingerprints and exit\n");
     printf("  -v        show verbose messages\n");
     printf("  -load sessname  Load settings from saved session\n");
-    printf("  -ssh -telnet -rlogin -raw\n");
+    printf("  -ssh -telnet -rlogin -raw -serial\n");
     printf("            force use of a particular protocol\n");
     printf("  -P port   connect to specified port\n");
     printf("  -l user   connect with specified username\n");
@@ -564,6 +565,8 @@ static void usage(void)
     printf("  -N        don't start a shell/command (SSH-2 only)\n");
     printf("  -nc host:port\n");
     printf("            open tunnel in place of session (SSH-2 only)\n");
+    printf("  -sercfg configuration-string (e.g. 19200,8,n,1,X)\n");
+    printf("            Specify the serial configuration (serial only)\n");
     exit(1);
 }
 
@@ -584,6 +587,7 @@ int main(int argc, char **argv)
     int exitcode;
     int errors;
     int use_subsystem = 0;
+    int got_host = FALSE;
     void *ldisc;
     long now;
 
@@ -657,7 +661,7 @@ int main(int argc, char **argv)
 		errors = 1;
 	    }
 	} else if (*p) {
-	    if (!cfg_launchable(&cfg)) {
+	    if (!cfg_launchable(&cfg) || !(got_host || loaded_session)) {
 		char *q = p;
 
 		/*
@@ -684,6 +688,7 @@ int main(int argc, char **argv)
 			cfg.port = -1;
 		    strncpy(cfg.host, q, sizeof(cfg.host) - 1);
 		    cfg.host[sizeof(cfg.host) - 1] = '\0';
+		    got_host = TRUE;
 		} else {
 		    char *r, *user, *host;
 		    /*
@@ -732,8 +737,10 @@ int main(int argc, char **argv)
 			    strncpy(cfg.host, host, sizeof(cfg.host) - 1);
 			    cfg.host[sizeof(cfg.host) - 1] = '\0';
 			    cfg.port = default_port;
+			    got_host = TRUE;
 			} else {
 			    cfg = cfg2;
+			    loaded_session = TRUE;
 			}
 		    }
 
@@ -780,7 +787,7 @@ int main(int argc, char **argv)
     if (errors)
 	return 1;
 
-    if (!cfg_launchable(&cfg)) {
+    if (!cfg_launchable(&cfg) || !(got_host || loaded_session)) {
 	usage();
     }
 
@@ -1030,7 +1037,9 @@ int main(int argc, char **argv)
 	if (FD_ISSET(signalpipe[0], &rset)) {
 	    char c[1];
 	    struct winsize size;
-	    read(signalpipe[0], c, 1); /* ignore its value; it'll be `x' */
+	    if (read(signalpipe[0], c, 1) <= 0)
+		/* ignore error */;
+	    /* ignore its value; it'll be `x' */
 	    if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0)
 		back->size(backhandle, size.ws_col, size.ws_row);
 	}