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/*
* Copyright (c) 2018, 2022 Stefan Sperling <stsp@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "got_compat.h"
#include <errno.h>
#include <stdio.h>
#include <signal.h>
#include <poll.h>
#include <time.h>
#include <unistd.h>
#include "got_error.h"
#include "got_lib_poll.h"
const struct got_error *
got_poll_fd(int fd, int events, int timeout)
{
struct pollfd pfd[1];
struct timespec ts;
sigset_t sigset;
int n;
pfd[0].fd = fd;
pfd[0].events = events;
ts.tv_sec = timeout;
ts.tv_nsec = 0;
if (sigemptyset(&sigset) == -1)
return got_error_from_errno("sigemptyset");
if (sigaddset(&sigset, SIGWINCH) == -1)
return got_error_from_errno("sigaddset");
n = ppoll(pfd, 1, timeout == INFTIM ? NULL : &ts, &sigset);
if (n == -1)
return got_error_from_errno("ppoll");
if (n == 0) {
if (pfd[0].revents & POLLHUP)
return got_error(GOT_ERR_EOF);
return got_error(GOT_ERR_TIMEOUT);
}
if (pfd[0].revents & (POLLERR | POLLNVAL))
return got_error_from_errno("poll error");
if (pfd[0].revents & events)
return NULL;
if (pfd[0].revents & POLLHUP)
return got_error(GOT_ERR_EOF);
return got_error(GOT_ERR_INTERRUPT);
}
const struct got_error *
got_poll_read_full_timeout(int fd, size_t *len, void *buf, size_t bufsize,
size_t minbytes, int timeout)
{
const struct got_error *err = NULL;
size_t have = 0;
ssize_t r;
if (minbytes > bufsize)
return got_error(GOT_ERR_NO_SPACE);
while (have < minbytes) {
err = got_poll_fd(fd, POLLIN, timeout);
if (err)
return err;
r = read(fd, buf + have, bufsize - have);
if (r == -1)
return got_error_from_errno("read");
if (r == 0)
return got_error(GOT_ERR_EOF);
have += r;
}
*len = have;
return NULL;
}
const struct got_error *
got_poll_read_full(int fd, size_t *len, void *buf, size_t bufsize,
size_t minbytes)
{
return got_poll_read_full_timeout(fd, len, buf, bufsize,
minbytes, INFTIM);
}
const struct got_error *
got_poll_write_full(int fd, const void *buf, off_t len)
{
return got_poll_write_full_timeout(fd, buf, len, INFTIM);
}
const struct got_error *
got_poll_write_full_timeout(int fd, const void *buf, off_t len, int timeout)
{
const struct got_error *err = NULL;
off_t wlen = 0;
ssize_t w = 0;
while (wlen != len) {
if (wlen > 0) {
err = got_poll_fd(fd, POLLOUT, timeout);
if (err)
return err;
}
w = write(fd, buf + wlen, len - wlen);
if (w == -1) {
if (errno != EAGAIN)
return got_error_from_errno("write");
} else
wlen += w;
}
return NULL;
}
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