man/sd_bus_error-example.c

   1 /* SPDX-License-Identifier: MIT-0 */
   2
   3 #include <errno.h>
   4 #include <string.h>
   5 #include <unistd.h>
   6 #include <systemd/sd-bus.h>
   7
   8 int writer_with_negative_errno_return(int fd, sd_bus_error *error) {
   9   const char *message = "Hello, World!\n";
  10
  11   ssize_t n = write(fd, message, strlen(message));
  12   if (n >= 0)
  13     return n; /* On success, return the number of bytes written, possibly 0. */
  14
  15   /* On error, initialize the error structure, and also propagate the errno
  16    * value that write(2) set for us. */
  17   return sd_bus_error_set_errnof(error, errno, "Failed to write to fd %i: %m", fd);
  18 }