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Documentation is licensed under LGPL-2.1-or-later. Scripts are MIT to facilitate reuse. Examples are relicensed to CC0-1.0 to maximise copy-and-paste for users, with permission from authors.
42 lines
1 KiB
C
42 lines
1 KiB
C
/* SPDX-License-Identifier: CC0-1.0 */
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#include <stdio.h>
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#include <string.h>
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#include <systemd/sd-journal.h>
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int main(int argc, char *argv[]) {
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int r;
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sd_journal *j;
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r = sd_journal_open(&j, SD_JOURNAL_LOCAL_ONLY);
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if (r < 0) {
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fprintf(stderr, "Failed to open journal: %s\n", strerror(-r));
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return 1;
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}
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for (;;) {
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const void *d;
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size_t l;
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r = sd_journal_next(j);
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if (r < 0) {
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fprintf(stderr, "Failed to iterate to next entry: %s\n", strerror(-r));
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break;
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}
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if (r == 0) {
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/* Reached the end, let's wait for changes, and try again */
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r = sd_journal_wait(j, (uint64_t) -1);
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if (r < 0) {
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fprintf(stderr, "Failed to wait for changes: %s\n", strerror(-r));
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break;
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}
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continue;
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}
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r = sd_journal_get_data(j, "MESSAGE", &d, &l);
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if (r < 0) {
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fprintf(stderr, "Failed to read message field: %s\n", strerror(-r));
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continue;
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}
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printf("%.*s\n", (int) l, (const char*) d);
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}
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sd_journal_close(j);
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return 0;
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}
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