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systemd-stable/man/sd_bus_error-example.c
Zbigniew Jędrzejewski-Szmek 80f6c459b5 man/sd-bus: discuss negative-return values and add example
Fixes #22816.

(cherry picked from commit 8f24777156)
(cherry picked from commit 11b8069929)
2022-06-02 20:09:14 +02:00

19 lines
581 B
C

/* SPDX-License-Identifier: CC0-1.0 */
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <sd-bus.h>
int writer_with_negative_errno_return(int fd, sd_bus_error *error) {
const char *message = "Hello, World!\n";
ssize_t n = write(fd, message, strlen(message));
if (n >= 0)
return n; /* On success, return the number of bytes written, possibly 0. */
/* On error, initialize the error structure, and also propagate the errno
* value that write(2) set for us. */
return sd_bus_error_set_errnof(error, errno, "Failed to write to fd %i: %m", fd);
}