diff options
| -rw-r--r-- | src/stats.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/src/stats.c b/src/stats.c index 30c0169d..c4aa24e5 100644 --- a/src/stats.c +++ b/src/stats.c @@ -293,9 +293,10 @@ static int stats_file_remap(struct stats_file *file, size_t size) if (file->addr == NULL) { /* * Though the buffer is not shared between processes, we still - * have to take MAP_SHARED because MAP_PRIVATE does not guarantee - * that writes will hit the file eventually. For more details - * please read the mmap man pages. + * have to take MAP_SHARED because MAP_PRIVATE does not + * guarantee that writes will hit the file without an explicit + * call to munmap or msync. For more details please read the + * mmap man pages. */ addr = mmap(NULL, new_size, PROT_READ | PROT_WRITE, MAP_SHARED, file->fd, 0); @@ -306,6 +307,11 @@ static int stats_file_remap(struct stats_file *file, size_t size) if (addr == MAP_FAILED) { connman_error("mmap error %s for %s", strerror(errno), file->name); + if (errno == EINVAL) { + connman_error("%s might be on a file system, such as " + "JFFS2, that does not allow shared " + "writable mappings.", file->name); + } return -errno; } |