diff options
Diffstat (limited to 'sbin/dmesg/dmesg.c')
| -rw-r--r-- | sbin/dmesg/dmesg.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/sbin/dmesg/dmesg.c b/sbin/dmesg/dmesg.c index f0fcb81..827ed8e 100644 --- a/sbin/dmesg/dmesg.c +++ b/sbin/dmesg/dmesg.c @@ -111,15 +111,22 @@ main(int argc, char *argv[]) if (memf == NULL) { /* - * Running kernel. Use sysctl. This gives an unwrapped - * buffer as a side effect. + * Running kernel. Use sysctl. This gives an unwrapped buffer + * as a side effect. Remove nulterm (if present) so the value + * returned by sysctl is formatted as the rest of the code + * expects (the same as the value read from a core file below). */ if (sysctlbyname("kern.msgbuf", NULL, &buflen, NULL, 0) == -1) err(1, "sysctl kern.msgbuf"); + /* Allocate extra room for growth between the sysctl calls. */ + buflen += buflen/8; + /* Allocate more than sysctl sees, for room to append \n\0. */ if ((bp = malloc(buflen + 2)) == NULL) errx(1, "malloc failed"); if (sysctlbyname("kern.msgbuf", bp, &buflen, NULL, 0) == -1) err(1, "sysctl kern.msgbuf"); + if (buflen > 0 && bp[buflen - 1] == '\0') + buflen--; if (clear) if (sysctlbyname("kern.msgbuf_clear", NULL, NULL, &clear, sizeof(int))) err(1, "sysctl kern.msgbuf_clear"); |
