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virprocess: Make virProcessRunInMountNamespace use virProcessRunInFork

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Both virProcessRunInMountNamespace() and virProcessRunInFork()
look very similar. De-duplicate the code and make
virProcessRunInMountNamespace() call virProcessRunInFork().

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
This commit is contained in:
Michal Privoznik 2018-10-16 11:24:39 +02:00
parent 9e8e74f463
commit 0f464afde1
1 changed files with 13 additions and 51 deletions
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64
src/util/virprocess.c
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@ -1073,16 +1073,22 @@ int virProcessGetStartTime(pid_t pid,
#endif
static int virProcessNamespaceHelper(int errfd,
pid_t pid,
virProcessNamespaceCallback cb,
typedef struct _virProcessNamespaceHelperData virProcessNamespaceHelperData;
struct _virProcessNamespaceHelperData {
pid_t pid;
virProcessNamespaceCallback cb;
void *opaque;
};
static int virProcessNamespaceHelper(pid_t pid ATTRIBUTE_UNUSED,
void *opaque)
{
virProcessNamespaceHelperData *data = opaque;
int fd = -1;
int ret = -1;
VIR_AUTOFREE(char *) path = NULL;
if (virAsprintf(&path, "/proc/%lld/ns/mnt", (long long) pid) < 0)
if (virAsprintf(&path, "/proc/%lld/ns/mnt", (long long) data->pid) < 0)
goto cleanup;
if ((fd = open(path, O_RDONLY)) < 0) {
@ -1097,16 +1103,9 @@ static int virProcessNamespaceHelper(int errfd,
goto cleanup;
}
ret = cb(pid, opaque);
ret = data->cb(data->pid, data->opaque);
cleanup:
if (ret < 0) {
virErrorPtr err = virGetLastError();
if (err) {
size_t len = strlen(err->message) + 1;
ignore_value(safewrite(errfd, err->message, len));
}
}
VIR_FORCE_CLOSE(fd);
return ret;
}
@ -1122,46 +1121,9 @@ virProcessRunInMountNamespace(pid_t pid,
virProcessNamespaceCallback cb,
void *opaque)
{
int ret = -1;
pid_t child = -1;
int errfd[2] = { -1, -1 };
virProcessNamespaceHelperData data = {.pid = pid, .cb = cb, .opaque = opaque};
if (pipe2(errfd, O_CLOEXEC) < 0) {
virReportSystemError(errno, "%s",
_("Cannot create pipe for child"));
return -1;
}
if ((child = virFork()) < 0)
goto cleanup;
if (child == 0) {
VIR_FORCE_CLOSE(errfd[0]);
ret = virProcessNamespaceHelper(errfd[1], pid,
cb, opaque);
VIR_FORCE_CLOSE(errfd[1]);
_exit(ret < 0 ? EXIT_CANCELED : ret);
} else {
int status;
VIR_AUTOFREE(char *) buf = NULL;
VIR_FORCE_CLOSE(errfd[1]);
ignore_value(virFileReadHeaderFD(errfd[0], 1024, &buf));
ret = virProcessWait(child, &status, false);
if (!ret) {
ret = status == EXIT_CANCELED ? -1 : status;
if (ret) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("child reported: %s"),
NULLSTR(buf));
}
}
}
cleanup:
VIR_FORCE_CLOSE(errfd[0]);
VIR_FORCE_CLOSE(errfd[1]);
return ret;
return virProcessRunInFork(virProcessNamespaceHelper, &data);
}