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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <fcntl.h>
#include <stddef.h>
#include "sd-daemon.h"
#include "alloc-util.h"
#include "dirent-util.h"
#include "fd-util.h"
#include "fdset.h"
#include "log.h"
#include "macro.h"
#include "parse-util.h"
#include "path-util.h"
#include "set.h"
#include "stat-util.h"
#define MAKE_SET(s) ((Set*) s)
#define MAKE_FDSET(s) ((FDSet*) s)
FDSet *fdset_new(void) {
return MAKE_FDSET(set_new(NULL));
}
static inline void fdset_shallow_freep(FDSet **s) {
/* Destroys the set, but does not free the fds inside, like fdset_free()! */
set_free(MAKE_SET(*ASSERT_PTR(s)));
}
int fdset_new_array(FDSet **ret, const int fds[], size_t n_fds) {
_cleanup_(fdset_shallow_freep) FDSet *s = NULL;
int r;
assert(ret);
assert(fds || n_fds == 0);
s = fdset_new();
if (!s)
return -ENOMEM;
for (size_t i = 0; i < n_fds; i++) {
r = fdset_put(s, fds[i]);
if (r < 0)
return r;
}
*ret = TAKE_PTR(s);
return 0;
}
void fdset_close(FDSet *s) {
void *p;
while ((p = set_steal_first(MAKE_SET(s)))) {
/* Valgrind's fd might have ended up in this set here, due to fdset_new_fill(). We'll ignore
* all failures here, so that the EBADFD that valgrind will return us on close() doesn't
* influence us */
/* When reloading duplicates of the private bus connection fds and suchlike are closed here,
* which has no effect at all, since they are only duplicates. So don't be surprised about
* these log messages. */
log_debug("Closing set fd %i", PTR_TO_FD(p));
(void) close_nointr(PTR_TO_FD(p));
}
}
FDSet* fdset_free(FDSet *s) {
fdset_close(s);
set_free(MAKE_SET(s));
return NULL;
}
int fdset_put(FDSet *s, int fd) {
assert(s);
assert(fd >= 0);
return set_put(MAKE_SET(s), FD_TO_PTR(fd));
}
int fdset_consume(FDSet *s, int fd) {
int r;
assert(s);
assert(fd >= 0);
r = fdset_put(s, fd);
if (r < 0)
safe_close(fd);
return r;
}
int fdset_put_dup(FDSet *s, int fd) {
_cleanup_close_ int copy = -EBADF;
int r;
assert(s);
assert(fd >= 0);
copy = fcntl(fd, F_DUPFD_CLOEXEC, 3);
if (copy < 0)
return -errno;
r = fdset_put(s, copy);
if (r < 0)
return r;
return TAKE_FD(copy);
}
bool fdset_contains(FDSet *s, int fd) {
assert(s);
assert(fd >= 0);
return !!set_get(MAKE_SET(s), FD_TO_PTR(fd));
}
int fdset_remove(FDSet *s, int fd) {
assert(s);
assert(fd >= 0);
return set_remove(MAKE_SET(s), FD_TO_PTR(fd)) ? fd : -ENOENT;
}
int fdset_new_fill(FDSet **ret) {
_cleanup_(fdset_shallow_freep) FDSet *s = NULL;
_cleanup_closedir_ DIR *d = NULL;
int r;
assert(ret);
/* Creates an fdset and fills in all currently open file descriptors. */
d = opendir("/proc/self/fd");
if (!d) {
if (errno == ENOENT && proc_mounted() == 0)
return -ENOSYS;
return -errno;
}
s = fdset_new();
if (!s)
return -ENOMEM;
FOREACH_DIRENT(de, d, return -errno) {
int fd = -EBADF;
r = safe_atoi(de->d_name, &fd);
if (r < 0)
return r;
if (fd < 3)
continue;
if (fd == dirfd(d))
continue;
r = fdset_put(s, fd);
if (r < 0)
return r;
}
*ret = TAKE_PTR(s);
return 0;
}
int fdset_cloexec(FDSet *fds, bool b) {
void *p;
int r;
assert(fds);
SET_FOREACH(p, MAKE_SET(fds)) {
r = fd_cloexec(PTR_TO_FD(p), b);
if (r < 0)
return r;
}
return 0;
}
int fdset_new_listen_fds(FDSet **ret, bool unset) {
_cleanup_(fdset_shallow_freep) FDSet *s = NULL;
int n, fd, r;
assert(ret);
/* Creates an fdset and fills in all passed file descriptors */
s = fdset_new();
if (!s)
return -ENOMEM;
n = sd_listen_fds(unset);
for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd ++) {
r = fdset_put(s, fd);
if (r < 0)
return r;
}
*ret = TAKE_PTR(s);
return 0;
}
int fdset_to_array(FDSet *fds, int **ret) {
unsigned j = 0, m;
void *e;
int *a;
assert(ret);
m = fdset_size(fds);
if (m > INT_MAX) /* We want to be able to return an "int" */
return -ENOMEM;
if (m == 0) {
*ret = NULL; /* suppress array allocation if empty */
return 0;
}
a = new(int, m);
if (!a)
return -ENOMEM;
SET_FOREACH(e, MAKE_SET(fds))
a[j++] = PTR_TO_FD(e);
assert(j == m);
*ret = TAKE_PTR(a);
return (int) m;
}
int fdset_close_others(FDSet *fds) {
_cleanup_free_ int *a = NULL;
int n;
n = fdset_to_array(fds, &a);
if (n < 0)
return n;
return close_all_fds(a, n);
}
unsigned fdset_size(FDSet *fds) {
return set_size(MAKE_SET(fds));
}
bool fdset_isempty(FDSet *fds) {
return set_isempty(MAKE_SET(fds));
}
int fdset_iterate(FDSet *s, Iterator *i) {
void *p;
if (!set_iterate(MAKE_SET(s), i, &p))
return -ENOENT;
return PTR_TO_FD(p);
}
int fdset_steal_first(FDSet *fds) {
void *p;
p = set_steal_first(MAKE_SET(fds));
if (!p)
return -ENOENT;
return PTR_TO_FD(p);
}
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