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https://github.com/morgan9e/systemd
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ce16d177dd
We use gnu11 to build, hence we can use structured initializer with casting, and it is not necessary to use different patterns on initialization and assignment. Addresses https://github.com/systemd/systemd/pull/26560#discussion_r1118875447.
113 lines
3.7 KiB
C
113 lines
3.7 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include <poll.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <sys/uio.h>
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#include "macro.h"
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#include "time-util.h"
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int flush_fd(int fd);
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ssize_t loop_read(int fd, void *buf, size_t nbytes, bool do_poll);
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int loop_read_exact(int fd, void *buf, size_t nbytes, bool do_poll);
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int loop_write(int fd, const void *buf, size_t nbytes, bool do_poll);
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int pipe_eof(int fd);
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int ppoll_usec(struct pollfd *fds, size_t nfds, usec_t timeout);
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int fd_wait_for_event(int fd, int event, usec_t timeout);
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ssize_t sparse_write(int fd, const void *p, size_t sz, size_t run_length);
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static inline size_t IOVEC_TOTAL_SIZE(const struct iovec *i, size_t n) {
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size_t r = 0;
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for (size_t j = 0; j < n; j++)
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r += i[j].iov_len;
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return r;
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}
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static inline bool IOVEC_INCREMENT(struct iovec *i, size_t n, size_t k) {
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/* Returns true if there is nothing else to send (bytes written cover all of the iovec),
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* false if there's still work to do. */
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for (size_t j = 0; j < n; j++) {
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size_t sub;
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if (i[j].iov_len == 0)
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continue;
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if (k == 0)
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return false;
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sub = MIN(i[j].iov_len, k);
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i[j].iov_len -= sub;
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i[j].iov_base = (uint8_t*) i[j].iov_base + sub;
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k -= sub;
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}
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assert(k == 0); /* Anything else would mean that we wrote more bytes than available,
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* or the kernel reported writing more bytes than sent. */
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return true;
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}
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static inline bool FILE_SIZE_VALID(uint64_t l) {
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/* ftruncate() and friends take an unsigned file size, but actually cannot deal with file sizes larger than
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* 2^63 since the kernel internally handles it as signed value. This call allows checking for this early. */
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return (l >> 63) == 0;
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}
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static inline bool FILE_SIZE_VALID_OR_INFINITY(uint64_t l) {
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/* Same as above, but allows one extra value: -1 as indication for infinity. */
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if (l == UINT64_MAX)
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return true;
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return FILE_SIZE_VALID(l);
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}
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#define IOVEC_NULL (struct iovec) {}
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#define IOVEC_MAKE(base, len) (struct iovec) { .iov_base = (base), .iov_len = (len) }
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#define IOVEC_MAKE_STRING(string) \
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({ \
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char *_s = (char*) (string); \
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IOVEC_MAKE(_s, strlen(_s)); \
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})
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char* set_iovec_string_field(struct iovec *iovec, size_t *n_iovec, const char *field, const char *value);
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char* set_iovec_string_field_free(struct iovec *iovec, size_t *n_iovec, const char *field, char *value);
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struct iovec_wrapper {
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struct iovec *iovec;
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size_t count;
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};
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struct iovec_wrapper *iovw_new(void);
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struct iovec_wrapper *iovw_free(struct iovec_wrapper *iovw);
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struct iovec_wrapper *iovw_free_free(struct iovec_wrapper *iovw);
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void iovw_free_contents(struct iovec_wrapper *iovw, bool free_vectors);
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int iovw_put(struct iovec_wrapper *iovw, void *data, size_t len);
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static inline int iovw_consume(struct iovec_wrapper *iovw, void *data, size_t len) {
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/* Move data into iovw or free on error */
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int r = iovw_put(iovw, data, len);
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if (r < 0)
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free(data);
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return r;
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}
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int iovw_put_string_field(struct iovec_wrapper *iovw, const char *field, const char *value);
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int iovw_put_string_field_free(struct iovec_wrapper *iovw, const char *field, char *value);
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void iovw_rebase(struct iovec_wrapper *iovw, char *old, char *new);
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size_t iovw_size(struct iovec_wrapper *iovw);
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void iovec_array_free(struct iovec *iov, size_t n);
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