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DarwinProcessList: retry getting list of all processes on ENOMEM

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The process count might change between the two sysctl() calls getting
the size and getting the data.

Retry (3 times) in case the data-retrieval sysctl() call fails with ENOMEM.

see http://mirror.informatimago.com/next/developer.apple.com/qa/qa2001/qa1123.html

Related: #118
This commit is contained in:
Christian Göttsche 2020-11-17 15:17:19 +01:00 committed by cgzones
parent 6c2849ec81
commit 72df930241
1 changed files with 17 additions and 19 deletions
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36
darwin/DarwinProcessList.c
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@ -8,6 +8,7 @@ in the source distribution for its full text.
#include "DarwinProcessList.h"
#include <err.h>
#include <errno.h>
#include <libproc.h>
#include <stdbool.h>
#include <stdio.h>
@ -107,27 +108,24 @@ static struct kinfo_proc* ProcessList_getKInfoProcs(size_t* count) {
int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_ALL, 0 };
struct kinfo_proc* processes = NULL;
/* Note the two calls to sysctl(). One to get length and one to get the
* data. This -does- mean that the second call could end up with a missing
* process entry or two.
*/
*count = 0;
if (sysctl(mib, 4, NULL, count, NULL, 0) < 0) {
CRT_fatalError("Unable to get size of kproc_infos");
for (int retry = 3; retry > 0; retry--) {
size_t size = 0;
if (sysctl(mib, 4, NULL, &size, NULL, 0) < 0 || size == 0) {
CRT_fatalError("Unable to get size of kproc_infos");
}
processes = xRealloc(processes, size);
if (sysctl(mib, 4, processes, &size, NULL, 0) == 0) {
*count = size / sizeof(struct kinfo_proc);
return processes;
}
if (errno != ENOMEM)
break;
}
processes = xMalloc(*count);
if (processes == NULL) {
CRT_fatalError("Out of memory for kproc_infos");
}
if (sysctl(mib, 4, processes, count, NULL, 0) < 0) {
CRT_fatalError("Unable to get kinfo_procs");
}
*count = *count / sizeof(struct kinfo_proc);
return processes;
CRT_fatalError("Unable to get kinfo_procs");
}
ProcessList* ProcessList_new(UsersTable* usersTable, Hashtable* pidMatchList, uid_t userId) {