core: Record ExecMainStartTimestamp before forking

[thirdparty/systemd.git] / src / basic / io-util.h

/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once

#include <poll.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <sys/types.h>

#include "macro.h"
#include "time-util.h"

int flush_fd(int fd);

ssize_t loop_read(int fd, void *buf, size_t nbytes, bool do_poll);
int loop_read_exact(int fd, void *buf, size_t nbytes, bool do_poll);

int loop_write_full(int fd, const void *buf, size_t nbytes, usec_t timeout);
static inline int loop_write(int fd, const void *buf, size_t nbytes) {
        return loop_write_full(fd, buf, nbytes, 0);
}

int pipe_eof(int fd);

int ppoll_usec(struct pollfd *fds, size_t nfds, usec_t timeout);
int fd_wait_for_event(int fd, int event, usec_t timeout);

ssize_t sparse_write(int fd, const void *p, size_t sz, size_t run_length);

static inline bool FILE_SIZE_VALID(uint64_t l) {
        /* ftruncate() and friends take an unsigned file size, but actually cannot deal with file sizes larger than
         * 2^63 since the kernel internally handles it as signed value. This call allows checking for this early. */

        return (l >> 63) == 0;
}

static inline bool FILE_SIZE_VALID_OR_INFINITY(uint64_t l) {

        /* Same as above, but allows one extra value: -1 as indication for infinity. */

        if (l == UINT64_MAX)
                return true;

        return FILE_SIZE_VALID(l);

}