Minimize ztest stack frame size

[zfs.git] / cmd / ztest / ztest.c

diff --git a/cmd/ztest/ztest.c b/cmd/ztest/ztest.c
index 973e7b2..65cbbe0 100644 (file)
--- a/cmd/ztest/ztest.c
+++ b/cmd/ztest/ztest.c
@@ -5900,12 +5900,13 @@ exec_child(char *cmd, char *libpath, boolean_t ignorekill, int *statusp)
 {
        pid_t pid;
        int status;
-       char cmdbuf[MAXPATHLEN];
+       char *cmdbuf = NULL;
 
        pid = fork();
 
        if (cmd == NULL) {
-               (void) strlcpy(cmdbuf, getexecname(), sizeof (cmdbuf));
+               cmdbuf = umem_alloc(MAXPATHLEN, UMEM_NOFAIL);
+               (void) strlcpy(cmdbuf, getexecname(), MAXPATHLEN);
                cmd = cmdbuf;
        }
 
@@ -5931,6 +5932,11 @@ exec_child(char *cmd, char *libpath, boolean_t ignorekill, int *statusp)
                fatal(B_TRUE, "exec failed: %s", cmd);
        }
 
+       if (cmdbuf != NULL) {
+               umem_free(cmdbuf, MAXPATHLEN);
+               cmd = NULL;
+       }
+
        while (waitpid(pid, &status, 0) != pid)
                continue;
        if (statusp != NULL)
@@ -5997,7 +6003,7 @@ main(int argc, char **argv)
        char timebuf[100];
        char numbuf[6];
        spa_t *spa;
-       char cmd[MAXNAMELEN];
+       char *cmd;
        boolean_t hasalt;
        int f;
        char *fd_data_str = getenv("ZTEST_FD_DATA");
@@ -6054,7 +6060,8 @@ main(int argc, char **argv)
                    (u_longlong_t)ztest_opts.zo_time);
        }
 
-       (void) strlcpy(cmd, getexecname(), sizeof (cmd));
+       cmd = umem_alloc(MAXNAMELEN, UMEM_NOFAIL);
+       (void) strlcpy(cmd, getexecname(), MAXNAMELEN);
 
        zs->zs_do_init = B_TRUE;
        if (strlen(ztest_opts.zo_alt_ztest) != 0) {
@@ -6195,5 +6202,7 @@ main(int argc, char **argv)
                    kills, iters - kills, (100.0 * kills) / MAX(1, iters));
        }
 
+       umem_free(cmd, MAXNAMELEN);
+
        return (0);
 }