ofproto-dpif: Use sequence number to wake up main thread for

[sliver-openvswitch.git] / lib / command-line.c

diff --git a/lib/command-line.c b/lib/command-line.c
index 2f99798..cb73a25 100644 (file)
--- a/lib/command-line.c
+++ b/lib/command-line.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2009, 2010 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2010, 2011, 2013, 2014 Nicira, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,7 +19,11 @@
 #include <getopt.h>
 #include <limits.h>
 #include <stdlib.h>
+#include "ovs-thread.h"
 #include "util.h"
+#include "vlog.h"
+
+VLOG_DEFINE_THIS_MODULE(command_line);
 
 /* Given the GNU-style long options in 'options', returns a string that may be
  * passed to getopt() with the corresponding short options.  The caller is
@@ -29,7 +33,7 @@ long_options_to_short_options(const struct option options[])
 {
     char short_options[UCHAR_MAX * 3 + 1];
     char *p = short_options;
-    
+
     for (; options->name; options++) {
         const struct option *o = options;
         if (o->flag == NULL && o->val > 0 && o->val <= UCHAR_MAX) {
@@ -43,7 +47,7 @@ long_options_to_short_options(const struct option options[])
         }
     }
     *p = '\0';
-    
+
     return xstrdup(short_options);
 }
 
@@ -66,33 +70,40 @@ run_command(int argc, char *argv[], const struct command commands[])
         if (!strcmp(p->name, argv[0])) {
             int n_arg = argc - 1;
             if (n_arg < p->min_args) {
-                ovs_fatal(0, "'%s' command requires at least %d arguments",
-                          p->name, p->min_args);
+                VLOG_FATAL( "'%s' command requires at least %d arguments",
+                            p->name, p->min_args);
             } else if (n_arg > p->max_args) {
-                ovs_fatal(0, "'%s' command takes at most %d arguments",
-                          p->name, p->max_args);
+                VLOG_FATAL("'%s' command takes at most %d arguments",
+                           p->name, p->max_args);
             } else {
                 p->handler(argc, argv);
                 if (ferror(stdout)) {
-                    ovs_fatal(0, "write to stdout failed");
+                    VLOG_FATAL("write to stdout failed");
                 }
                 if (ferror(stderr)) {
-                    ovs_fatal(0, "write to stderr failed");
+                    VLOG_FATAL("write to stderr failed");
                 }
                 return;
             }
         }
     }
 
-    ovs_fatal(0, "unknown command '%s'; use --help for help", argv[0]);
+    VLOG_FATAL("unknown command '%s'; use --help for help", argv[0]);
 }
 \f
 /* Process title. */
 
 #ifdef __linux__
-static char *argv_start;       /* Start of command-line arguments in memory. */
-static size_t argv_size;       /* Number of bytes of command-line arguments. */
-static char *saved_proctitle;  /* Saved command-line arguments. */
+static struct ovs_mutex proctitle_mutex = OVS_MUTEX_INITIALIZER;
+
+/* Start of command-line arguments in memory. */
+static char *argv_start OVS_GUARDED_BY(proctitle_mutex);
+
+/* Number of bytes of command-line arguments. */
+static size_t argv_size OVS_GUARDED_BY(proctitle_mutex);
+
+/* Saved command-line arguments. */
+static char *saved_proctitle OVS_GUARDED_BY(proctitle_mutex);
 
 /* Prepares the process so that proctitle_set() can later succeed.
  *
@@ -107,11 +118,13 @@ proctitle_init(int argc, char **argv)
 {
     int i;
 
+    assert_single_threaded();
     if (!argc || !argv[0]) {
         /* This situation should never occur, but... */
         return;
     }
 
+    ovs_mutex_lock(&proctitle_mutex);
     /* Specialized version of first loop iteration below. */
     argv_start = argv[0];
     argv_size = strlen(argv[0]) + 1;
@@ -135,18 +148,20 @@ proctitle_init(int argc, char **argv)
         /* Copy out the old argument so we can reuse the space. */
         argv[i] = xstrdup(argv[i]);
     }
+    ovs_mutex_unlock(&proctitle_mutex);
 }
 
-/* Changes the name of the process, as shown by "ps", to 'format', which is
- * formatted as if by printf(). */
+/* Changes the name of the process, as shown by "ps", to the program name
+ * followed by 'format', which is formatted as if by printf(). */
 void
 proctitle_set(const char *format, ...)
 {
     va_list args;
     int n;
 
+    ovs_mutex_lock(&proctitle_mutex);
     if (!argv_start || argv_size < 8) {
-        return;
+        goto out;
     }
 
     if (!saved_proctitle) {
@@ -154,7 +169,10 @@ proctitle_set(const char *format, ...)
     }
 
     va_start(args, format);
-    n = vsnprintf(argv_start, argv_size, format, args);
+    n = snprintf(argv_start, argv_size, "%s: ", program_name);
+    if (n < argv_size) {
+        n += vsnprintf(argv_start + n, argv_size - n, format, args);
+    }
     if (n >= argv_size) {
         /* The name is too long, so add an ellipsis at the end. */
         strcpy(&argv_start[argv_size - 4], "...");
@@ -164,30 +182,38 @@ proctitle_set(const char *format, ...)
         memset(&argv_start[n], '\0', argv_size - n);
     }
     va_end(args);
+
+out:
+    ovs_mutex_unlock(&proctitle_mutex);
 }
 
 /* Restores the process's original command line, as seen by "ps". */
 void
 proctitle_restore(void)
 {
+    ovs_mutex_lock(&proctitle_mutex);
     if (saved_proctitle) {
         memcpy(argv_start, saved_proctitle, argv_size);
         free(saved_proctitle);
         saved_proctitle = NULL;
     }
+    ovs_mutex_unlock(&proctitle_mutex);
 }
 #else  /* !__linux__ */
 /* Stubs that don't do anything on non-Linux systems. */
 
 void
-proctitle_init(int argc UNUSED, char **argv UNUSED)
+proctitle_init(int argc OVS_UNUSED, char **argv OVS_UNUSED)
 {
 }
 
+#if !(defined(__FreeBSD__) || defined(__NetBSD__))
+/* On these platforms we #define this to setproctitle. */
 void
-proctitle_set(const char *format UNUSED, ...)
+proctitle_set(const char *format OVS_UNUSED, ...)
 {
 }
+#endif
 
 void
 proctitle_restore(void)