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author | Ondrej Kos <okos@redhat.com> | 2013-02-07 12:11:43 +0100 |
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committer | Jakub Hrozek <jhrozek@redhat.com> | 2013-02-11 15:45:10 +0100 |
commit | 075df914c0355e1dcafad1a128877be11241725c (patch) | |
tree | c8709f4da7e8c48c22958ecf9f58ac27347076a8 /src/util/atomic_io.h | |
parent | 9ec97a7502739c4966b5f3eb9d6b6ed282cf954b (diff) | |
download | sssd2-075df914c0355e1dcafad1a128877be11241725c.tar.gz sssd2-075df914c0355e1dcafad1a128877be11241725c.tar.xz sssd2-075df914c0355e1dcafad1a128877be11241725c.zip |
UTIL: Add function for atomic I/O
Diffstat (limited to 'src/util/atomic_io.h')
-rw-r--r-- | src/util/atomic_io.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/src/util/atomic_io.h b/src/util/atomic_io.h new file mode 100644 index 00000000..ffae31d6 --- /dev/null +++ b/src/util/atomic_io.h @@ -0,0 +1,40 @@ +/* + 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) + +#endif /* __SSSD_ATOMIC_IO_H__ */ |