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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
630 B
C
30 lines
630 B
C
/* SPDX-License-Identifier: CC0-1.0 */
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#include <errno.h>
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#include <stdio.h>
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#include <systemd/sd-journal.h>
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int main(int argc, char *argv[]) {
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sd_journal *j;
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const void *d;
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size_t l;
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int r;
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r = sd_journal_open(&j, SD_JOURNAL_LOCAL_ONLY);
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if (r < 0) {
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errno = -r;
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fprintf(stderr, "Failed to open journal: %m\n");
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return 1;
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}
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r = sd_journal_query_unique(j, "_SYSTEMD_UNIT");
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if (r < 0) {
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errno = -r;
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fprintf(stderr, "Failed to query journal: %m\n");
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return 1;
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}
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SD_JOURNAL_FOREACH_UNIQUE(j, d, l)
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printf("%.*s\n", (int) l, (const char*) d);
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sd_journal_close(j);
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return 0;
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}
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