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/* pipeutils.c -- Utilities for using pipes as signals
This file is part of redshift-ng.
redshift-ng is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
redshift-ng 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with redshift-ng. If not, see <http://www.gnu.org/licenses/>.
Copyright (c) 2017 Jon Lund Steffensen <jonlst@gmail.com>
Copyright (c) 2025 Mattias Andrée <m@maandree.se>
*/
#include "common.h"
/* Create non-blocking set of pipe fds. */
int
pipeutils_create_nonblocking(int pipefds[2])
{
#ifdef WINDOWS
(void) pipefds;
return -1;
#else
int i, flags;
# if defined(__linux__) && !defined(MISSING_PIPE2)
if (!pipe2(pipefds, O_NONBLOCK)) {
return 0;
} else if (errno != ENOSYS) {
weprintf("pipe2 <buffer> O_NONBLOCK:");
return -1;
}
# endif
if (pipe(pipefds)) {
weprintf("pipe:");
return -1;
}
for (i = 0; i < 2; i++) {
flags = fcntl(pipefds[0], F_GETFL);
if (flags == -1) {
weprintf("fcntl <pipe> F_GETFL:");
goto fail;
}
if (fcntl(pipefds[0], F_SETFL, flags | O_NONBLOCK)) {
weprintf("fcntl <pipe> F_SETFL +O_NONBLOCK:");
goto fail;
}
}
return 0;
fail:
close(pipefds[0]);
close(pipefds[1]);
return -1;
#endif
}
/* Signal on write-end of pipe. */
void
pipeutils_signal(int write_fd)
{
write(write_fd, "", 1);
}
/* Mark signal as handled on read-end of pipe. */
void
pipeutils_handle_signal(int read_fd)
{
char data;
read(read_fd, &data, 1);
}
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