use HOST_NAME_MAX to size buffers for gethostname(2)

[thirdparty/git.git] / builtin / gc.c

diff --git a/builtin/gc.c b/builtin/gc.c
index 069950d0b417f5eb97cd756ae32df7a2fb13abce..5befd518fd1616c606efef9e4be15d6283811530 100644 (file)
--- a/builtin/gc.c
+++ b/builtin/gc.c
@@ -220,7 +220,7 @@ static int need_to_gc(void)
 static const char *lock_repo_for_gc(int force, pid_t* ret_pid)
 {
        static struct lock_file lock;
-       char my_host[128];
+       char my_host[HOST_NAME_MAX + 1];
        struct strbuf sb = STRBUF_INIT;
        struct stat st;
        uintmax_t pid;
@@ -239,8 +239,12 @@ static const char *lock_repo_for_gc(int force, pid_t* ret_pid)
        fd = hold_lock_file_for_update(&lock, pidfile_path,
                                       LOCK_DIE_ON_ERROR);
        if (!force) {
-               static char locking_host[128];
+               static char locking_host[HOST_NAME_MAX + 1];
+               static char *scan_fmt;
                int should_exit;
+
+               if (!scan_fmt)
+                       scan_fmt = xstrfmt("%s %%%dc", "%"SCNuMAX, HOST_NAME_MAX);
                fp = fopen(pidfile_path, "r");
                memset(locking_host, 0, sizeof(locking_host));
                should_exit =
@@ -256,7 +260,7 @@ static const char *lock_repo_for_gc(int force, pid_t* ret_pid)
                         * running.
                         */
                        time(NULL) - st.st_mtime <= 12 * 3600 &&
-                       fscanf(fp, "%"SCNuMAX" %127c", &pid, locking_host) == 2 &&
+                       fscanf(fp, scan_fmt, &pid, locking_host) == 2 &&
                        /* be gentle to concurrent "gc" on remote hosts */
                        (strcmp(locking_host, my_host) || !kill(pid, 0) || errno == EPERM);
                if (fp != NULL)