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src/util/atomic_io.h
52 строки
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Sumit Bose
utils: add non-blocking read from child processes
22 апр 2025, 16:05
22 апр 2025, 16:05
4c183b1
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/* Authors: Jan Cholasta <jcholast@redhat.com> Copyright (C) 2012 Red Hat This program 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. This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */ #ifndef __SSSD_ATOMIC_IO_H__ #define __SSSD_ATOMIC_IO_H__ #include <unistd.h> #include <stdbool.h> #include <poll.h> #include <errno.h> /* Performs a read or write operation in an manner that is seemingly atomic * to the caller. * * Please note that the function does not perform any asynchronous operation * so the operation might potentially block */ ssize_t sss_atomic_io_s(int fd, void *buf, size_t n, bool do_read); #define sss_atomic_read_s(fd, buf, n) sss_atomic_io_s(fd, buf, n, true) #define sss_atomic_write_s(fd, buf, n) sss_atomic_io_s(fd, buf, n, false) /** * Write length of the buffer then the buffer itself. * * (uint32_t)length + buffer */ ssize_t sss_atomic_write_safe_s(int fd, void *buf, size_t len); /** * First, read uint32_t as a message length, then read the rest of the message * expecting given length. The exact length is returned in _len parameter. */ ssize_t sss_atomic_read_safe_s(int fd, void *buf, size_t max_len, size_t *_len); #endif /* __SSSD_ATOMIC_IO_H__ */