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zdtm: add support for time namespaces

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For ns and uns flavors, tests run in separate time namespaces.

Signed-off-by: Andrei Vagin <avagin@gmail.com>
This commit is contained in:
Andrei Vagin 2019-08-14 07:44:02 +03:00
parent ddba4af608
commit 3fd0fa4bdc
1 changed files with 68 additions and 0 deletions
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68
test/zdtm/lib/ns.c
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@ -15,6 +15,8 @@
#include <signal.h>
#include <sched.h>
#include <sys/socket.h>
#include <time.h>
#include <sys/prctl.h>
#include "zdtmtst.h"
#include "ns.h"
@ -207,6 +209,39 @@ write_out:
write(STDERR_FILENO, buf, MIN(len, sizeof(buf)));
}
#ifndef CLONE_NEWTIME
#define CLONE_NEWTIME 0x00000080 /* New time namespace */
#endif
static inline int _settime(clockid_t clk_id, time_t offset)
{
int fd, len;
char buf[4096];
if (clk_id == CLOCK_MONOTONIC_COARSE || clk_id == CLOCK_MONOTONIC_RAW)
clk_id = CLOCK_MONOTONIC;
len = snprintf(buf, sizeof(buf), "%d %ld 0", clk_id, offset);
fd = open("/proc/self/timens_offsets", O_WRONLY);
if (fd < 0) {
fprintf(stderr, "open(/proc/self/timens_offsets): %m");
return -1;
}
if (write(fd, buf, len) != len) {
fprintf(stderr, "write(/proc/self/timens_offsets): %m");
return -1;
}
if (close(fd)) {
fprintf(stderr, "close(/proc/self/timens_offsets): %m");
return -1;
}
return 0;
}
#define STATUS_FD 255
static int ns_exec(void *_arg)
{
@ -218,6 +253,7 @@ static int ns_exec(void *_arg)
setsid();
prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
ret = dup2(args->status_pipe[1], STATUS_FD);
if (ret < 0) {
fprintf(stderr, "dup2() failed: %m\n");
@ -236,6 +272,35 @@ static int ns_exec(void *_arg)
return -1;
}
static int create_timens(void)
{
int fd;
if (unshare(CLONE_NEWTIME)) {
if (errno == EINVAL) {
fprintf(stderr, "timens isn't supported\n");
return 0;
} else {
fprintf(stderr, "unshare(CLONE_NEWTIME) failed: %m");
exit(1);
}
}
if (_settime(CLOCK_MONOTONIC, 10 * 24 * 60 * 60))
exit(1);
if (_settime(CLOCK_BOOTTIME, 20 * 24 * 60 * 60))
exit(1);
fd = open("/proc/self/ns/time_for_children", O_RDONLY);
if (fd < 0)
exit(1);
if (setns(fd, 0))
exit(1);
close(fd);
return 0;
}
int ns_init(int argc, char **argv)
{
struct sigaction sa = {
@ -253,6 +318,9 @@ int ns_init(int argc, char **argv)
exit(1);
}
if (create_timens())
exit(1);
if (init_notify()) {
fprintf(stderr, "Can't init pre-dump notification: %m");
exit(1);