[src/trunk]: src/usr.bin/telnet preserve errno because we are doing system ca...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/9e3941bcce64
branches:  trunk
changeset: 958534:9e3941bcce64
user:      christos <christos%NetBSD.org@localhost>
date:      Sat Jan 09 18:26:03 2021 +0000

description:
preserve errno because we are doing system calls between error printing
and error setting.

diffstat:

 usr.bin/telnet/commands.c |  12 ++++++++----
 1 files changed, 8 insertions(+), 4 deletions(-)

diffs (66 lines):

diff -r 330716862fab -r 9e3941bcce64 usr.bin/telnet/commands.c
--- a/usr.bin/telnet/commands.c Sat Jan 09 18:22:42 2021 +0000
+++ b/usr.bin/telnet/commands.c Sat Jan 09 18:26:03 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: commands.c,v 1.78 2021/01/09 18:22:42 christos Exp $   */
+/*     $NetBSD: commands.c,v 1.79 2021/01/09 18:26:03 christos Exp $   */
 
 /*
  * Copyright (C) 1997 and 1998 WIDE Project.
@@ -63,7 +63,7 @@
 #if 0
 static char sccsid[] = "@(#)commands.c 8.4 (Berkeley) 5/30/95";
 #else
-__RCSID("$NetBSD: commands.c,v 1.78 2021/01/09 18:22:42 christos Exp $");
+__RCSID("$NetBSD: commands.c,v 1.79 2021/01/09 18:26:03 christos Exp $");
 #endif
 #endif /* not lint */
 
@@ -2086,7 +2086,7 @@
 {
     struct addrinfo hints, *res, *res0;
     const char *cause = "telnet: unknown";
-    int error;
+    int error, serrno = 0;
     char *cmd, *hostp = 0;
     const char *portp = 0;
     const char *user = 0;
@@ -2193,6 +2193,7 @@
        printf("Trying %s...\n", sockaddr_ntop(res->ai_addr));
        net = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
        if (net < 0) {
+           serrno = errno;
            cause = "telnet: socket";
            continue;
        }
@@ -2203,11 +2204,13 @@
 
 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
        if (setpolicy(net, res, ipsec_policy_in) < 0) {
+           serrno = errno;
            (void) NetClose(net);
            net = -1;
            continue;
        }
        if (setpolicy(net, res, ipsec_policy_out) < 0) {
+           serrno = errno;
            (void) NetClose(net);
            net = -1;
            continue;
@@ -2218,6 +2221,7 @@
            if (res->ai_next) {
                warn("Connect to address %s: ", sockaddr_ntop(res->ai_addr));
            }
+           serrno = errno;
            cause = "Unable to connect to remote host";
            (void) NetClose(net);
            net = -1;
@@ -2232,7 +2236,7 @@
     }
     freeaddrinfo(res0);
     if (net < 0 || connected == 0) {
-       warn("%s", cause);
+       warnc(serrno, "%s", cause);
        return 0;
     }