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Move the check whether the clear flag is set. This has 2 advantages

Browse Source 
- When operating on a core file (-M) and -c is specified we don't clear
  the message buffer of the running system.
- If we don't have permission to clear the buffer print the error message
  only. That's what Linux does in this case, where this feature was ported
  from, and it ensures that the error message doesn't get lost in the noise.

Discussed with:	antoine, cognet
Approved by:	cognet
This commit is contained in:
Florian Smeets 2013-06-11 17:46:32 +00:00
parent b2737f9e63
commit e1de133c2e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=251618
1 changed files with 3 additions and 4 deletions
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7
sbin/dmesg/dmesg.c
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@ -120,6 +120,9 @@ main(int argc, char *argv[])
errx(1, "malloc failed");
if (sysctlbyname("kern.msgbuf", bp, &buflen, NULL, 0) == -1)
err(1, "sysctl kern.msgbuf");
if (clear)
if (sysctlbyname("kern.msgbuf_clear", NULL, NULL, &clear, sizeof(int)))
err(1, "sysctl kern.msgbuf_clear");
} else {
/* Read in kernel message buffer and do sanity checks. */
kd = kvm_open(nlistf, memf, NULL, O_RDONLY, "dmesg");
@ -196,10 +199,6 @@ main(int argc, char *argv[])
(void)strvisx(visbp, p, nextp - p, 0);
(void)printf("%s", visbp);
}
if (clear)
if (sysctlbyname("kern.msgbuf_clear", NULL, NULL, &clear, sizeof(int)))
err(1, "sysctl kern.msgbuf_clear");
exit(0);
}