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openvz: convert popen to virCommand

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popen must be matched with pclose (not fclose), or it will leak
resources.  Furthermore, it is a lousy interface when it comes to
signal handling.  We're much better off using our decent command
wrapper.  Note that virCommand guarantees that VIR_FREE(outbuf) is
both required and safe to call, whether virCommandRun succeeded or
failed.

* src/openvz/openvz_conf.c (openvzLoadDomains, openvzGetVEID):
Replace popen with virCommand usage.
This commit is contained in:
Eric Blake 2010-12-02 17:29:34 -07:00
parent cc5e2a849c
commit bfd6267bcd
1 changed files with 29 additions and 26 deletions
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55
src/openvz/openvz_conf.c
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@ -51,6 +51,7 @@
#include "util.h"
#include "nodeinfo.h"
#include "files.h"
#include "command.h"
#define VIR_FROM_THIS VIR_FROM_OPENVZ
@ -433,26 +434,26 @@ openvzFreeDriver(struct openvz_driver *driver)
int openvzLoadDomains(struct openvz_driver *driver) {
FILE *fp;
int veid, ret;
char status[16];
char uuidstr[VIR_UUID_STRING_BUFLEN];
virDomainObjPtr dom = NULL;
char temp[50];
char *outbuf = NULL;
char *line;
virCommandPtr cmd = NULL;
if (openvzAssignUUIDs() < 0)
return -1;
if ((fp = popen(VZLIST " -a -ovpsid,status -H 2>/dev/null", "r")) == NULL) {
openvzError(VIR_ERR_INTERNAL_ERROR, "%s", _("popen failed"));
return -1;
}
while (!feof(fp)) {
if (fscanf(fp, "%d %s\n", &veid, status) != 2) {
if (feof(fp))
break;
cmd = virCommandNewArgList(VZLIST, "-a", "-ovpsid,status", "-H", NULL);
virCommandSetOutputBuffer(cmd, &outbuf);
if (virCommandRun(cmd, NULL) < 0)
goto cleanup;
line = *outbuf ? outbuf : NULL;
while (line) {
if (sscanf(line, "%d %s\n", &veid, status) != 2) {
openvzError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Failed to parse vzlist output"));
goto cleanup;
@ -526,9 +527,14 @@ int openvzLoadDomains(struct openvz_driver *driver) {
virDomainObjUnlock(dom);
dom = NULL;
line = strchr(line, '\n');
if (line)
line++;
}
VIR_FORCE_FCLOSE(fp);
virCommandFree(cmd);
VIR_FREE(outbuf);
return 0;
@ -536,7 +542,8 @@ int openvzLoadDomains(struct openvz_driver *driver) {
virReportOOMError();
cleanup:
VIR_FORCE_FCLOSE(fp);
virCommandFree(cmd);
VIR_FREE(outbuf);
if (dom)
virDomainObjUnref(dom);
return -1;
@ -978,27 +985,23 @@ static int openvzAssignUUIDs(void)
*/
int openvzGetVEID(const char *name) {
char *cmd;
virCommandPtr cmd;
char *outbuf;
int veid;
FILE *fp;
bool ok;
if (virAsprintf(&cmd, "%s %s -ovpsid -H", VZLIST, name) < 0) {
openvzError(VIR_ERR_INTERNAL_ERROR, "%s",
_("virAsprintf failed"));
cmd = virCommandNewArgList(VZLIST, name, "-ovpsid", "-H", NULL);
virCommandSetOutputBuffer(cmd, &outbuf);
if (virCommandRun(cmd, NULL) < 0) {
virCommandFree(cmd);
VIR_FREE(outbuf);
return -1;
}
fp = popen(cmd, "r");
VIR_FREE(cmd);
virCommandFree(cmd);
ok = sscanf(outbuf, "%d\n", &veid) == 1;
VIR_FREE(outbuf);
if (fp == NULL) {
openvzError(VIR_ERR_INTERNAL_ERROR, "%s", _("popen failed"));
return -1;
}
ok = fscanf(fp, "%d\n", &veid ) == 1;
VIR_FORCE_FCLOSE(fp);
if (ok && veid >= 0)
return veid;