Hi!
> FWIW, this is a patch for dmesg(1) I use. You can enable timestamp
> conversion using -t and optionally specify a different output format
> using -f "fmt".
>
> If interested for inclusion in base, I could try to re-format it
> and come up with a manpage diff...
Oh yes, please!
> --- sbin/dmesg/dmesg.c 2023-12-27 17:49:57.000000000 +0100
> +++ sbin/dmesg/dmesg.c 2026-01-22 09:20:28.987020000 +0100
> @@ -60,6 +60,7 @@
> #include <unistd.h>
> #include <vis.h>
> #include <sys/syslog.h>
> +#include <time.h>
>
> static struct nlist nl[] = {
> #define X_MSGBUF 0
> @@ -76,18 +77,23 @@
> main(int argc, char *argv[])
> {
> struct msgbuf *bufp, cur;
> + struct timeval boottime;
> + char timebuf[64];
> char *bp, *ep, *memf, *nextp, *nlistf, *p, *q, *visbp;
> + const char *timefmt = "%d %b %T";
> kvm_t *kd;
> + time_t time;
> size_t buflen, bufpos;
> long pri;
> - int ch, clear;
> + int ch, clear, timeconv;
> bool all;
>
> all = false;
> clear = false;
> + timeconv = false;
> (void) setlocale(LC_CTYPE, "");
> memf = nlistf = NULL;
> - while ((ch = getopt(argc, argv, "acM:N:")) != -1)
> + while ((ch = getopt(argc, argv, "actf:M:N:")) != -1)
> switch(ch) {
> case 'a':
> all = true;
> @@ -95,6 +101,12 @@
> case 'c':
> clear = true;
> break;
> + case 't':
> + timeconv = true;
> + break;
> + case 'f':
> + timefmt = optarg;
> + break;
> case 'M':
> memf = optarg;
> break;
> @@ -109,6 +121,13 @@
> if (argc != 0)
> usage();
>
> + if( timeconv ) {
> + int mib[6] = { CTL_KERN, KERN_BOOTTIME };
> + size_t l = sizeof boottime;
> + if (sysctl(mib, 2, &boottime, &l, 0, 0) < 0)
> + err(1, "sysctl kern.boottime");
> + }
> +
> if (memf == NULL) {
> /*
> * Running kernel. Use sysctl. This gives an unwrapped buffer
> @@ -200,7 +219,22 @@
> }
>
> (void)strvisx(visbp, p, nextp - p, 0);
> - (void)printf("%s", visbp);
> + bufpos = strspn( visbp+1, "0123456789" ) + 1;
> + if( timeconv != true
> + || bufpos < 2
> + || visbp[0] != '['
> + || visbp[bufpos] != ']'
> + || visbp[bufpos+1] != ' ' ) {
> + (void)printf("%s", visbp);
> + continue;
> + }
> +
> + visbp[bufpos] = '\0';
> + time = boottime.tv_sec + strtoull( visbp+1, NULL, 10 );
> + if( strftime( timebuf, sizeof timebuf, timefmt, localtime(
> &time ) ) != 0 )
> + (void)printf( "[%s]%s", timebuf, visbp + bufpos + 1 );
> + else
> + (void)printf("%s", visbp);
> }
> exit(0);
> }
> @@ -208,6 +242,6 @@
> void
> usage(void)
> {
> - fprintf(stderr, "usage: dmesg [-ac] [-M core [-N system]]\n");
> + fprintf(stderr, "usage: dmesg [-ac] [-t [-f output_fmt]] [-M core [-N
> system]]\n");
> exit(1);
> }
>
>
> -Andre
>
--
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