event: add ability to change fd of an active event source

[elogind.git] / src / journal / cat.c

diff --git a/src/journal/cat.c b/src/journal/cat.c
index 6745f1ce0ac18c4ecb3ffa7a5a7d76e301aad49b..02b75642a33ab9fb3de3e30c20fea8607db73909 100644 (file)
--- a/src/journal/cat.c
+++ b/src/journal/cat.c
@@ -6,16 +6,16 @@
   Copyright 2012 Lennart Poettering
 
   systemd is free software; you can redistribute it and/or modify it
-  under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 2 of the License, or
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
   (at your option) any later version.
 
   systemd is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-  General Public License for more details.
+  Lesser General Public License for more details.
 
-  You should have received a copy of the GNU General Public License
+  You should have received a copy of the GNU Lesser General Public License
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
@@ -25,7 +25,7 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <errno.h>
-#include <sys/fcntl.h>
+#include <fcntl.h>
 
 #include <systemd/sd-journal.h>
 
@@ -33,7 +33,7 @@
 #include "build.h"
 
 static char *arg_identifier = NULL;
-static char arg_priority = LOG_INFO;
+static int arg_priority = LOG_INFO;
 static bool arg_level_prefix = true;
 
 static int help(void) {
@@ -59,11 +59,11 @@ static int parse_argv(int argc, char *argv[]) {
 
         static const struct option options[] = {
                 { "help",         no_argument,       NULL, 'h'              },
-                { "version" ,     no_argument,       NULL, ARG_VERSION      },
+                { "version",      no_argument,       NULL, ARG_VERSION      },
                 { "identifier",   required_argument, NULL, 't'              },
                 { "priority",     required_argument, NULL, 'p'              },
                 { "level-prefix", required_argument, NULL, ARG_LEVEL_PREFIX },
-                { NULL,           0,                 NULL, 0                }
+                {}
         };
 
         int c;
@@ -76,12 +76,10 @@ static int parse_argv(int argc, char *argv[]) {
                 switch (c) {
 
                 case 'h':
-                        help();
-                        return 0;
+                        return help();
 
                 case ARG_VERSION:
                         puts(PACKAGE_STRING);
-                        puts(DISTRIBUTION);
                         puts(SYSTEMD_FEATURES);
                         return 0;
 
@@ -91,10 +89,8 @@ static int parse_argv(int argc, char *argv[]) {
                                 arg_identifier = NULL;
                         else {
                                 arg_identifier = strdup(optarg);
-                                if (!arg_identifier) {
-                                        log_error("Out of memory.");
-                                        return -ENOMEM;
-                                }
+                                if (!arg_identifier)
+                                        return log_oom();
                         }
                         break;
 
@@ -118,9 +114,11 @@ static int parse_argv(int argc, char *argv[]) {
                         break;
                 }
 
-                default:
-                        log_error("Unknown option code %c", c);
+                case '?':
                         return -EINVAL;
+
+                default:
+                        assert_not_reached("Unhandled option");
                 }
         }
 
@@ -139,7 +137,7 @@ int main(int argc, char *argv[]) {
 
         fd = sd_journal_stream_fd(arg_identifier, arg_priority, arg_level_prefix);
         if (fd < 0) {
-                log_error("Failed to create stream fd: %s", strerror(fd));
+                log_error("Failed to create stream fd: %s", strerror(-fd));
                 r = fd;
                 goto finish;
         }
@@ -148,7 +146,7 @@ int main(int argc, char *argv[]) {
 
         if (dup3(fd, STDOUT_FILENO, 0) < 0 ||
             dup3(fd, STDERR_FILENO, 0) < 0) {
-                log_error("Failed to duplicate fd: %s", strerror(fd));
+                log_error("Failed to duplicate fd: %m");
                 r = -errno;
                 goto finish;
         }
@@ -163,12 +161,13 @@ int main(int argc, char *argv[]) {
         else
                 execvp(argv[optind], argv + optind);
 
+        r = -errno;
+
         /* Let's try to restore a working stderr, so we can print the error message */
         if (saved_stderr >= 0)
                 dup3(saved_stderr, STDERR_FILENO, 0);
 
-        log_error("Failed to execute process: %m");
-        r = -errno;
+        log_error("Failed to execute process: %s", strerror(-r));
 
 finish:
         if (fd >= 0)