TMP: debug macos

cfg.c

@@ -107,6 +107,9 @@ static int open_safely(int *outfd, size_t *outsize, const char *path) {
   size_t len;
   struct stat st;
 
+  unsigned int Step = 0;
+  fprintf(stderr, "Enter %s (%s)\n", __func__, path);
+
   len = strlen(path);
   if (!len || path[0] != '/' || path[len - 1] == '/')
     return PAM_SERVICE_ERR;
@@ -117,18 +120,22 @@ static int open_safely(int *outfd, size_t *outsize, const char *path) {
 
   p = strtok_r(copy, "/", &saveptr);
   parent_fd = open("/", O_RDONLY | O_CLOEXEC | O_DIRECTORY, 0);
+  Step = 2;
   if (parent_fd == -1)
     goto exit;
 
   *outfd = -1;
   *outsize = 0;
 
+  Step = 10;
   while ((c = strtok_r(NULL, "/", &saveptr)) != NULL) {
     fd =
       openat(parent_fd, p, O_RDONLY | O_CLOEXEC | O_DIRECTORY | O_NOFOLLOW, 0);
+    fprintf(stderr, "%s check %s (%d)\n", __func__, p, fd);
     if (fd == -1) {
       if (errno == ENOENT)
         r = PAM_SUCCESS;
+      Step++;
       goto exit;
     }
 
@@ -148,28 +155,36 @@ static int open_safely(int *outfd, size_t *outsize, const char *path) {
   }
 
   fd = openat(parent_fd, p, O_RDONLY | O_CLOEXEC | O_NOCTTY | O_NOFOLLOW, 0);
+  fprintf(stderr, "%s lastcheck %s (%d)\n", __func__, p, fd);
   if (fd == -1) {
     if (errno == ENOENT)
       r = PAM_SUCCESS;
+    Step = 100;
     goto exit;
   }
 
+  Step = 101;
   if (fstat(fd, &st))
     goto exit;
 
 #ifndef PAM_U2F_TESTING
+  Step = 102;
   if (st.st_uid != 0)
     goto exit;
 #endif
+  Step = 103;
   if (!S_ISREG(st.st_mode) || st.st_mode & (S_IWGRP | S_IWOTH))
     goto exit;
 
   *outfd = fd;
   *outsize = st.st_size;
   fd = -1;
   r = PAM_SUCCESS;
+  Step = 1000;
 
 exit:
+  fprintf(stderr, "%s Exit %d at step %u, errno=[%s]\n", __func__, r, Step,
+          strerror(errno));
   if (parent_fd != -1)
     close(parent_fd);
   if (fd != -1)