Adding upstream version 255.4.upstream/255.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 46 insertions, 0 deletions

diff --git a/src/basic/io-util.h b/src/basic/io-util.h
new file mode 100644
index 0000000..e027c1a
--- /dev/null
+++ b/src/basic/io-util.h
@@ -0,0 +1,46 @@
+/* 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);
+
+}