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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
commit | b750101eb236130cf056c675997decbac904cc49 (patch) | |
tree | a5df1a06754bdd014cb975c051c83b01c9a97532 /src/basic/io-util.h | |
parent | Initial commit. (diff) | |
download | systemd-upstream.tar.xz systemd-upstream.zip |
Adding upstream version 252.22.upstream/252.22upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/basic/io-util.h | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/src/basic/io-util.h b/src/basic/io-util.h new file mode 100644 index 0000000..3afb134 --- /dev/null +++ b/src/basic/io-util.h @@ -0,0 +1,107 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +#pragma once + +#include <poll.h> +#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 ppoll_usec(struct pollfd *fds, size_t nfds, usec_t timeout); +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); + +static inline size_t IOVEC_TOTAL_SIZE(const struct iovec *i, size_t n) { + size_t r = 0; + + for (size_t j = 0; j < n; j++) + r += i[j].iov_len; + + return r; +} + +static inline bool IOVEC_INCREMENT(struct iovec *i, size_t n, size_t k) { + /* Returns true if there is nothing else to send (bytes written cover all of the iovec), + * false if there's still work to do. */ + + for (size_t j = 0; j < n; j++) { + size_t sub; + + if (i[j].iov_len == 0) + continue; + if (k == 0) + return false; + + 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; + } + + assert(k == 0); /* Anything else would mean that we wrote more bytes than available, + * or the kernel reported writing more bytes than sent. */ + return true; +} + +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_MAX) + return true; + + return FILE_SIZE_VALID(l); + +} + +#define IOVEC_INIT(base, len) { .iov_base = (base), .iov_len = (len) } +#define IOVEC_MAKE(base, len) (struct iovec) IOVEC_INIT(base, len) +#define IOVEC_INIT_STRING(string) IOVEC_INIT((char*) string, strlen(string)) +#define IOVEC_MAKE_STRING(string) (struct iovec) IOVEC_INIT_STRING(string) + +char* set_iovec_string_field(struct iovec *iovec, size_t *n_iovec, const char *field, const char *value); +char* set_iovec_string_field_free(struct iovec *iovec, size_t *n_iovec, const char *field, char *value); + +struct iovec_wrapper { + struct iovec *iovec; + size_t count; +}; + +struct iovec_wrapper *iovw_new(void); +struct iovec_wrapper *iovw_free(struct iovec_wrapper *iovw); +struct iovec_wrapper *iovw_free_free(struct iovec_wrapper *iovw); +void iovw_free_contents(struct iovec_wrapper *iovw, bool free_vectors); + +int iovw_put(struct iovec_wrapper *iovw, void *data, size_t len); +static inline int iovw_consume(struct iovec_wrapper *iovw, void *data, size_t len) { + /* Move data into iovw or free on error */ + int r = iovw_put(iovw, data, len); + if (r < 0) + free(data); + return r; +} + +int iovw_put_string_field(struct iovec_wrapper *iovw, const char *field, const char *value); +int iovw_put_string_field_free(struct iovec_wrapper *iovw, const char *field, char *value); +void iovw_rebase(struct iovec_wrapper *iovw, char *old, char *new); +size_t iovw_size(struct iovec_wrapper *iovw); |