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dmesg: accommodate message buffer growth between the sysctl calls

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Allocate 12.5% extra space to avoid ENOMEM when the message buffer
is growing steadily.

Reported by:	Steve Wahl <steve_wahl@dell.com> (and tested)
Approved by:	kib (mentor)
Obtained from:	Dell Inc.
MFC after:	1 week
This commit is contained in:
Eric van Gyzen 2015-04-20 20:07:39 +00:00
parent c207ff9319
commit f8ee95484e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=281787
1 changed files with 3 additions and 0 deletions
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3
sbin/dmesg/dmesg.c
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@ -118,6 +118,9 @@ main(int argc, char *argv[])
*/
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)