MINOR: startup: use global progname variable

Let's store progname in the global variable, as it is handy to use it in
different parts of code to format messages sent to stdout.

This reduces the number of arguments, which we should pass to some functions.

include/haproxy/global.h

@@ -50,6 +50,7 @@ extern int atexit_flag;
 extern unsigned char boot_seed[20];  // per-boot random seed (160 bits initially)
 extern THREAD_LOCAL struct buffer trash;
 extern char **init_env;
+extern char *progname;
 
 struct proxy;
 struct server;

include/haproxy/linuxcap.h

@@ -22,6 +22,6 @@ static inline int capget(cap_user_header_t hdrp, const cap_user_data_t datap)
 }
 int prepare_caps_for_setuid(int from_uid, int to_uid);
 int finalize_caps_after_setuid(int from_uid, int to_uid);
-int prepare_caps_from_permitted_set(int from_uid, int to_uid, const char *progname);
+int prepare_caps_from_permitted_set(int from_uid, int to_uid);
 
 #endif /* _HAPROXY_LINUXCAP_H */

src/haproxy.c

@@ -229,7 +229,7 @@ int connected_peers = 0; /* number of connected peers (verified ones) */
 int arg_mode = 0;	/* MODE_DEBUG etc as passed on command line ... */
 char *change_dir = NULL; /* set when -C is passed */
 char *check_condition = NULL; /* check condition passed to -cc */
-char *progname;
+char *progname = NULL; /* HAProxy binary's name */
 
 /* Here we store information about the pids of the processes we may pause
  * or kill. We will send them a signal every 10 ms until we can bind to all
@@ -1169,7 +1169,7 @@ static void cfgfiles_expand_directories(void)
  * frees in its stack the memory allocated for config files content, if it has
  * encountered an error.
  */
-static int load_cfg(char *progname)
+static int load_cfg()
 {
 	struct cfgfile *cfg, *cfg_tmp;
 
@@ -1197,7 +1197,7 @@ static int load_cfg(char *progname)
  * Otherwise, it returns an err_code, which may contain 0 (OK) or ERR_WARN,
  * ERR_ALERT.
  */
-static int read_cfg(char *progname)
+static int read_cfg()
 {
 	char *env_cfgfiles = NULL;
 	struct cfgfile *cfg;
@@ -1465,7 +1465,7 @@ static void ha_random_boot(char *const *argv)
  * configuration. Makes process to exit with 0, if the condition is true, with
  * 1, if the condition is false or with 2, if parse_line encounters an error.
  */
-static void do_check_condition(char *progname)
+static void do_check_condition()
 {
 	int result;
 	uint32_t err;
@@ -1603,8 +1603,6 @@ static void init_args(int argc, char **argv)
 {
 	char *err_msg = NULL;
 
-	progname = global.log_tag.area;
-
 	/* pre-fill in the global tuning options before we let the cmdline
 	 * change them.
 	 */
@@ -2333,7 +2331,7 @@ static void step_init_1()
 
 	/* Do check_condition, if we started with -cc, and exit. */
 	if (global.mode & MODE_CHECK_CONDITION)
-		do_check_condition(progname);
+		do_check_condition();
 
 	if (change_dir && chdir(change_dir) < 0) {
 		ha_alert("Could not change to directory %s : %s\n", change_dir, strerror(errno));
@@ -2937,7 +2935,7 @@ static void step_init_3(void)
 	 * binding to privileged ports.
 	 */
 	if (!master)
-	    prepare_caps_from_permitted_set(geteuid(), global.uid, progname);
+	    prepare_caps_from_permitted_set(geteuid(), global.uid);
 #endif
 }
 
@@ -3098,7 +3096,7 @@ static void read_cfg_in_discovery_mode(int argc, char **argv)
 	global.mode |= MODE_DISCOVERY;
 
 	usermsgs_clr("config");
-	if (load_cfg(progname) < 0) {
+	if (load_cfg() < 0) {
 		if (getenv("HAPROXY_MWORKER_REEXEC") != NULL) {
 			ha_warning("Master failed to load new configuration and "
 				   "can't start a new worker. Already running worker "
@@ -3114,7 +3112,7 @@ static void read_cfg_in_discovery_mode(int argc, char **argv)
 			exit(1);
 	}
 
-	if (read_cfg(progname) < 0) {
+	if (read_cfg() < 0) {
 		list_for_each_entry_safe(cfg, cfg_tmp, &cfg_cfgfiles, list) {
 			ha_free(&cfg->content);
 			ha_free(&cfg->filename);
@@ -3363,6 +3361,7 @@ void deinit(void)
 		}
 		free(init_env);
 	}
+	free(progname);
 
 } /* end deinit() */
 
@@ -3829,7 +3828,7 @@ int main(int argc, char **argv)
 			setenv("HAPROXY_MWORKER", "1", 1);
 		}
 		non_global_section_parsed = 0;
-		if (read_cfg(progname) < 0) {
+		if (read_cfg() < 0) {
 			list_for_each_entry_safe(cfg, cfg_tmp, &cfg_cfgfiles, list) {
 				ha_free(&cfg->content);
 				ha_free(&cfg->filename);

src/linuxcap.c

@@ -80,7 +80,7 @@ static uint32_t caplist;
  * LSTCHK_NETADM/LSTCHK_SYSADM is presented in global.last_checks and some
  * failures are encountered.
  */
-int prepare_caps_from_permitted_set(int from_uid, int to_uid, const char *progname)
+int prepare_caps_from_permitted_set(int from_uid, int to_uid)
 {
 	/* _LINUX_CAPABILITY_U32S_1 = 1 and corresponds to version 1, which is three
 	 * 32-bit integers set. So kernel in capset()/capget() will copy_from/to_user