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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "fd-util.h"
#include "inotify-util.h"
#include "stat-util.h"
bool inotify_event_next(
union inotify_event_buffer *buffer,
size_t size,
struct inotify_event **iterator,
int log_level) {
struct inotify_event *e;
size_t offset = 0;
assert(buffer);
assert(iterator);
if (*iterator) {
assert((uint8_t*) *iterator >= buffer->raw);
offset = (uint8_t*) *iterator - buffer->raw;
offset += offsetof(struct inotify_event, name) + (*iterator)->len;
}
if (size == offset)
return false; /* reached end of list */
if (size < offset ||
size - offset < offsetof(struct inotify_event, name)) {
log_full(log_level, "Received invalid inotify event, ignoring.");
return false;
}
e = CAST_ALIGN_PTR(struct inotify_event, buffer->raw + offset);
if (size - offset - offsetof(struct inotify_event, name) < e->len) {
log_full(log_level, "Received invalid inotify event, ignoring.");
return false;
}
*iterator = e;
return true;
}
int inotify_add_watch_fd(int fd, int what, uint32_t mask) {
int wd, r;
/* This is like inotify_add_watch(), except that the file to watch is not referenced by a path, but by an fd */
wd = inotify_add_watch(fd, FORMAT_PROC_FD_PATH(what), mask);
if (wd < 0) {
if (errno != ENOENT)
return -errno;
/* Didn't work with ENOENT? If so, then either /proc/ isn't mounted, or the fd is bad */
r = proc_mounted();
if (r == 0)
return -ENOSYS;
if (r > 0)
return -EBADF;
return -ENOENT; /* OK, no clue, let's propagate the original error */
}
return wd;
}
int inotify_add_watch_and_warn(int fd, const char *pathname, uint32_t mask) {
int wd;
wd = inotify_add_watch(fd, pathname, mask);
if (wd < 0) {
if (errno == ENOSPC)
return log_error_errno(errno, "Failed to add a watch for %s: inotify watch limit reached", pathname);
return log_error_errno(errno, "Failed to add a watch for %s: %m", pathname);
}
return wd;
}
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