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-rw-r--r--src/basic/io-util.c269
1 files changed, 0 insertions, 269 deletions
diff --git a/src/basic/io-util.c b/src/basic/io-util.c
deleted file mode 100644
index cc6dfa8c1b..0000000000
--- a/src/basic/io-util.c
+++ /dev/null
@@ -1,269 +0,0 @@
-/***
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <errno.h>
-#include <limits.h>
-#include <poll.h>
-#include <stdio.h>
-#include <time.h>
-#include <unistd.h>
-
-#include "io-util.h"
-#include "time-util.h"
-
-int flush_fd(int fd) {
- struct pollfd pollfd = {
- .fd = fd,
- .events = POLLIN,
- };
-
- /* Read from the specified file descriptor, until POLLIN is not set anymore, throwing away everything
- * read. Note that some file descriptors (notable IP sockets) will trigger POLLIN even when no data can be read
- * (due to IP packet checksum mismatches), hence this function is only safe to be non-blocking if the fd used
- * was set to non-blocking too. */
-
- for (;;) {
- char buf[LINE_MAX];
- ssize_t l;
- int r;
-
- r = poll(&pollfd, 1, 0);
- if (r < 0) {
- if (errno == EINTR)
- continue;
-
- return -errno;
-
- } else if (r == 0)
- return 0;
-
- l = read(fd, buf, sizeof(buf));
- if (l < 0) {
-
- if (errno == EINTR)
- continue;
-
- if (errno == EAGAIN)
- return 0;
-
- return -errno;
- } else if (l == 0)
- return 0;
- }
-}
-
-ssize_t loop_read(int fd, void *buf, size_t nbytes, bool do_poll) {
- uint8_t *p = buf;
- ssize_t n = 0;
-
- assert(fd >= 0);
- assert(buf);
-
- /* If called with nbytes == 0, let's call read() at least
- * once, to validate the operation */
-
- if (nbytes > (size_t) SSIZE_MAX)
- return -EINVAL;
-
- do {
- ssize_t k;
-
- k = read(fd, p, nbytes);
- if (k < 0) {
- if (errno == EINTR)
- continue;
-
- if (errno == EAGAIN && do_poll) {
-
- /* We knowingly ignore any return value here,
- * and expect that any error/EOF is reported
- * via read() */
-
- (void) fd_wait_for_event(fd, POLLIN, USEC_INFINITY);
- continue;
- }
-
- return n > 0 ? n : -errno;
- }
-
- if (k == 0)
- return n;
-
- assert((size_t) k <= nbytes);
-
- p += k;
- nbytes -= k;
- n += k;
- } while (nbytes > 0);
-
- return n;
-}
-
-int loop_read_exact(int fd, void *buf, size_t nbytes, bool do_poll) {
- ssize_t n;
-
- n = loop_read(fd, buf, nbytes, do_poll);
- if (n < 0)
- return (int) n;
- if ((size_t) n != nbytes)
- return -EIO;
-
- return 0;
-}
-
-int loop_write(int fd, const void *buf, size_t nbytes, bool do_poll) {
- const uint8_t *p = buf;
-
- assert(fd >= 0);
- assert(buf);
-
- if (nbytes > (size_t) SSIZE_MAX)
- return -EINVAL;
-
- do {
- ssize_t k;
-
- k = write(fd, p, nbytes);
- if (k < 0) {
- if (errno == EINTR)
- continue;
-
- if (errno == EAGAIN && do_poll) {
- /* We knowingly ignore any return value here,
- * and expect that any error/EOF is reported
- * via write() */
-
- (void) fd_wait_for_event(fd, POLLOUT, USEC_INFINITY);
- continue;
- }
-
- return -errno;
- }
-
- if (_unlikely_(nbytes > 0 && k == 0)) /* Can't really happen */
- return -EIO;
-
- assert((size_t) k <= nbytes);
-
- p += k;
- nbytes -= k;
- } while (nbytes > 0);
-
- return 0;
-}
-
-int pipe_eof(int fd) {
- struct pollfd pollfd = {
- .fd = fd,
- .events = POLLIN|POLLHUP,
- };
-
- int r;
-
- r = poll(&pollfd, 1, 0);
- if (r < 0)
- return -errno;
-
- if (r == 0)
- return 0;
-
- return pollfd.revents & POLLHUP;
-}
-
-int fd_wait_for_event(int fd, int event, usec_t t) {
-
- struct pollfd pollfd = {
- .fd = fd,
- .events = event,
- };
-
- struct timespec ts;
- int r;
-
- r = ppoll(&pollfd, 1, t == USEC_INFINITY ? NULL : timespec_store(&ts, t), NULL);
- if (r < 0)
- return -errno;
-
- if (r == 0)
- return 0;
-
- return pollfd.revents;
-}
-
-static size_t nul_length(const uint8_t *p, size_t sz) {
- size_t n = 0;
-
- while (sz > 0) {
- if (*p != 0)
- break;
-
- n++;
- p++;
- sz--;
- }
-
- return n;
-}
-
-ssize_t sparse_write(int fd, const void *p, size_t sz, size_t run_length) {
- const uint8_t *q, *w, *e;
- ssize_t l;
-
- q = w = p;
- e = q + sz;
- while (q < e) {
- size_t n;
-
- n = nul_length(q, e - q);
-
- /* If there are more than the specified run length of
- * NUL bytes, or if this is the beginning or the end
- * of the buffer, then seek instead of write */
- if ((n > run_length) ||
- (n > 0 && q == p) ||
- (n > 0 && q + n >= e)) {
- if (q > w) {
- l = write(fd, w, q - w);
- if (l < 0)
- return -errno;
- if (l != q -w)
- return -EIO;
- }
-
- if (lseek(fd, n, SEEK_CUR) == (off_t) -1)
- return -errno;
-
- q += n;
- w = q;
- } else if (n > 0)
- q += n;
- else
- q++;
- }
-
- if (q > w) {
- l = write(fd, w, q - w);
- if (l < 0)
- return -errno;
- if (l != q - w)
- return -EIO;
- }
-
- return q - (const uint8_t*) p;
-}
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