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b4096cecff
The need to set errno is very very ugly, but at least it is thread-safe and works correctly. Using strerror() is likely to be wrong, so let's not recommend that. People who do a lot of logging would provide use some wrapper that sets errno like we do, so nudge people towards %m. I tested that all the separate .c files compile cleanly.
30 lines
643 B
C
30 lines
643 B
C
/* SPDX-License-Identifier: CC0-1.0 */
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#include <errno.h>
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#include <syslog.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <systemd/sd-journal.h>
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#include <systemd/sd-daemon.h>
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int main(int argc, char *argv[]) {
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int fd;
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FILE *log;
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fd = sd_journal_stream_fd("test", LOG_INFO, 1);
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if (fd < 0) {
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errno = -fd;
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fprintf(stderr, "Failed to create stream fd: %m\n");
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return 1;
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}
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log = fdopen(fd, "w");
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if (!log) {
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fprintf(stderr, "Failed to create file object: %m\n");
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close(fd);
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return 1;
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}
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fprintf(log, "Hello World!\n");
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fprintf(log, SD_WARNING "This is a warning!\n");
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fclose(log);
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return 0;
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}
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