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Borrow the algorithm from kvm_getprocs() to fix procstat_getprocs() to

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handle the case where the process tables grows in between the calls to
fetch the size and fetch the table.

MFC after:	1 week
This commit is contained in:
John Baldwin 2013-06-11 20:00:49 +00:00
parent ed8fd1989f
commit 608203fd94
1 changed files with 11 additions and 7 deletions
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18
lib/libprocstat/libprocstat.c
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@ -253,7 +253,7 @@ procstat_getprocs(struct procstat *procstat, int what, int arg,
unsigned int *count)
{
struct kinfo_proc *p0, *p;
size_t len;
size_t len, olen;
int name[4];
int cnt;
int error;
@ -290,12 +290,16 @@ procstat_getprocs(struct procstat *procstat, int what, int arg,
warnx("no processes?");
goto fail;
}
p = malloc(len);
if (p == NULL) {
warnx("malloc(%zu)", len);
goto fail;
}
error = sysctl(name, 4, p, &len, NULL, 0);
do {
len += len / 10;
p = reallocf(p, len);
if (p == NULL) {
warnx("reallocf(%zu)", len);
goto fail;
}
olen = len;
error = sysctl(name, 4, p, &len, NULL, 0);
} while (error < 0 && errno == ENOMEM && olen == len);
if (error < 0 && errno != EPERM) {
warn("sysctl(kern.proc)");
goto fail;