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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:35:18 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:35:18 +0000
commitb750101eb236130cf056c675997decbac904cc49 (patch)
treea5df1a06754bdd014cb975c051c83b01c9a97532 /man/sd_bus_error-example.c
parentInitial commit. (diff)
downloadsystemd-b750101eb236130cf056c675997decbac904cc49.tar.xz
systemd-b750101eb236130cf056c675997decbac904cc49.zip
Adding upstream version 252.22.upstream/252.22
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'man/sd_bus_error-example.c')
-rw-r--r--man/sd_bus_error-example.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/man/sd_bus_error-example.c b/man/sd_bus_error-example.c
new file mode 100644
index 0000000..9b162eb
--- /dev/null
+++ b/man/sd_bus_error-example.c
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: MIT-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);
+}