diff options
author | Luke Shumaker <lukeshu@sbcglobal.net> | 2016-06-01 15:52:09 -0400 |
---|---|---|
committer | Luke Shumaker <lukeshu@sbcglobal.net> | 2016-06-01 15:52:09 -0400 |
commit | bb110bc7433adeb79b4814ef2a1c04e2160be396 (patch) | |
tree | c45048907133b8bbd7e2d86b350436a9ad0ffe8b /src/libbasic/io-util.h | |
parent | 192d82912f055a2b4a2b5c02f0ef69b002322bba (diff) |
./move.sh
Diffstat (limited to 'src/libbasic/io-util.h')
-rw-r--r-- | src/libbasic/io-util.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/src/libbasic/io-util.h b/src/libbasic/io-util.h new file mode 100644 index 0000000000..142c940d92 --- /dev/null +++ b/src/libbasic/io-util.h @@ -0,0 +1,95 @@ +#pragma once + +/*** + 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 <stdbool.h> +#include <stddef.h> +#include <stdint.h> +#include <sys/types.h> +#include <sys/uio.h> + +#include "macro.h" +#include "time-util.h" + +int flush_fd(int fd); + +ssize_t loop_read(int fd, void *buf, size_t nbytes, bool do_poll); +int loop_read_exact(int fd, void *buf, size_t nbytes, bool do_poll); +int loop_write(int fd, const void *buf, size_t nbytes, bool do_poll); + +int pipe_eof(int fd); + +int fd_wait_for_event(int fd, int event, usec_t timeout); + +ssize_t sparse_write(int fd, const void *p, size_t sz, size_t run_length); + +#define IOVEC_SET_STRING(i, s) \ + do { \ + struct iovec *_i = &(i); \ + char *_s = (char *)(s); \ + _i->iov_base = _s; \ + _i->iov_len = strlen(_s); \ + } while(false) + +static inline size_t IOVEC_TOTAL_SIZE(const struct iovec *i, unsigned n) { + unsigned j; + size_t r = 0; + + for (j = 0; j < n; j++) + r += i[j].iov_len; + + return r; +} + +static inline size_t IOVEC_INCREMENT(struct iovec *i, unsigned n, size_t k) { + unsigned j; + + for (j = 0; j < n; j++) { + size_t sub; + + if (_unlikely_(k <= 0)) + break; + + sub = MIN(i[j].iov_len, k); + i[j].iov_len -= sub; + i[j].iov_base = (uint8_t*) i[j].iov_base + sub; + k -= sub; + } + + return k; +} + +static inline bool FILE_SIZE_VALID(uint64_t l) { + /* ftruncate() and friends take an unsigned file size, but actually cannot deal with file sizes larger than + * 2^63 since the kernel internally handles it as signed value. This call allows checking for this early. */ + + return (l >> 63) == 0; +} + +static inline bool FILE_SIZE_VALID_OR_INFINITY(uint64_t l) { + + /* Same as above, but allows one extra value: -1 as indication for infinity. */ + + if (l == (uint64_t) -1) + return true; + + return FILE_SIZE_VALID(l); + +} |