Replace BSD MAXPATHLEN by POSIX PATH_MAX

Prefer using the POSIX constant PATH_MAX instead of the legacy BSD
derived MAXPATHLEN. The necessary includes for MAXPATHLEN and PATH_MAX
are <sys/param.h> and <limits.h>, respectively.
Signed-off-by: Felix Janda <felix.janda@posteo.de>
Tested-by: Yegor Yefremov <yegorslists@googlemail.com>

ip/ipnetns.c

@@ -4,7 +4,6 @@
 #include <sys/wait.h>
 #include <sys/inotify.h>
 #include <sys/mount.h>
-#include <sys/param.h>
 #include <sys/syscall.h>
 #include <stdio.h>
 #include <string.h>
@@ -437,7 +436,7 @@ static int is_pid(const char *str)
 static int netns_pids(int argc, char **argv)
 {
 	const char *name;
-	char net_path[MAXPATHLEN];
+	char net_path[PATH_MAX];
 	int netns;
 	struct stat netst;
 	DIR *dir;
@@ -472,7 +471,7 @@ static int netns_pids(int argc, char **argv)
 		return -1;
 	}
 	while((entry = readdir(dir))) {
-		char pid_net_path[MAXPATHLEN];
+		char pid_net_path[PATH_MAX];
 		struct stat st;
 		if (!is_pid(entry->d_name))
 			continue;
@@ -493,7 +492,7 @@ static int netns_pids(int argc, char **argv)
 static int netns_identify(int argc, char **argv)
 {
 	const char *pidstr;
-	char net_path[MAXPATHLEN];
+	char net_path[PATH_MAX];
 	int netns;
 	struct stat netst;
 	DIR *dir;
@@ -537,7 +536,7 @@ static int netns_identify(int argc, char **argv)
 	}
 
 	while((entry = readdir(dir))) {
-		char name_path[MAXPATHLEN];
+		char name_path[PATH_MAX];
 		struct stat st;
 
 		if (strcmp(entry->d_name, ".") == 0)
@@ -563,7 +562,7 @@ static int netns_identify(int argc, char **argv)
 
 static int on_netns_del(char *nsname, void *arg)
 {
-	char netns_path[MAXPATHLEN];
+	char netns_path[PATH_MAX];
 
 	snprintf(netns_path, sizeof(netns_path), "%s/%s", NETNS_RUN_DIR, nsname);
 	umount2(netns_path, MNT_DETACH);
@@ -612,7 +611,7 @@ static int netns_add(int argc, char **argv)
 	 * userspace tweaks like remounting /sys, or bind mounting
 	 * a new /etc/resolv.conf can be shared between uers.
 	 */
-	char netns_path[MAXPATHLEN];
+	char netns_path[PATH_MAX];
 	const char *name;
 	int fd;
 	int made_netns_run_dir_mount = 0;
@@ -707,7 +706,7 @@ static int set_netnsid_from_name(const char *name, int nsid)
 
 static int netns_set(int argc, char **argv)
 {
-	char netns_path[MAXPATHLEN];
+	char netns_path[PATH_MAX];
 	const char *name;
 	int netns, nsid;
 

lib/namespace.c

@@ -9,15 +9,16 @@
 
 #include <fcntl.h>
 #include <dirent.h>
+#include <limits.h>
 
 #include "utils.h"
 #include "namespace.h"
 
 static void bind_etc(const char *name)
 {
-	char etc_netns_path[MAXPATHLEN];
-	char netns_name[MAXPATHLEN];
-	char etc_name[MAXPATHLEN];
+	char etc_netns_path[PATH_MAX];
+	char netns_name[PATH_MAX];
+	char etc_name[PATH_MAX];
 	struct dirent *entry;
 	DIR *dir;
 
@@ -43,7 +44,7 @@ static void bind_etc(const char *name)
 
 int netns_switch(char *name)
 {
-	char net_path[MAXPATHLEN];
+	char net_path[PATH_MAX];
 	int netns;
 
 	snprintf(net_path, sizeof(net_path), "%s/%s", NETNS_RUN_DIR, name);
@@ -87,7 +88,7 @@ int netns_switch(char *name)
 
 int netns_get_fd(const char *name)
 {
-	char pathbuf[MAXPATHLEN];
+	char pathbuf[PATH_MAX];
 	const char *path, *ptr;
 
 	path = name;