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Linux: Improve handling of resource limits in misc/tst-ttyname

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An attempt to re-create a different PTY under the same name can fail
if the PTY has a very high number.  Try to increase the file
descriptor limit in this case, and bail out if this still does not
allow the test to proceed.
This commit is contained in:
Florian Weimer 2019-01-04 12:12:17 +01:00
parent ce7eb0e903
commit 4392898d8c
2 changed files with 52 additions and 4 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
2019-01-04 Florian Weimer <fweimer@redhat.com>
* sysdeps/unix/sysv/linux/tst-ttyname.c (adjust_file_limit): New
function.
(do_in_chroot_1): Call it.
(run_chroot_tests):
Improve error reporting in case it is not possible to create a
collision for the PTY name required by the test.
2019-01-03 Adhemerval Zanella <adhemerval.zanella@linaro.org>
* nptl/pthread_join_common.c (__pthread_timedjoin_ex): Use

47
sysdeps/unix/sysv/linux/tst-ttyname.c
View File

@ -27,6 +27,7 @@
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/resource.h>
#include <unistd.h>
#include <support/check.h>
@ -239,6 +240,32 @@ prepare (int argc, char **argv)
}
#define PREPARE prepare
/* Adjust the file limit so that we have a chance to open PTY. */
static void
adjust_file_limit (const char *pty)
{
int number = -1;
if (sscanf (pty, "/dev/pts/%d", &number) != 1 || number < 0)
FAIL_EXIT1 ("invalid PTY name: \"%s\"", pty);
/* Add a few additional descriptors to cover standard I/O streams
etc. */
rlim_t desired_limit = number + 10;
struct rlimit lim;
if (getrlimit (RLIMIT_NOFILE, &lim) != 0)
FAIL_EXIT1 ("getrlimit (RLIMIT_NOFILE): %m");
if (lim.rlim_cur < desired_limit)
{
printf ("info: adjusting RLIMIT_NOFILE from %llu to %llu\n",
(unsigned long long int) lim.rlim_cur,
(unsigned long long int) desired_limit);
lim.rlim_cur = desired_limit;
if (setrlimit (RLIMIT_NOFILE, &lim) != 0)
printf ("warning: setrlimit (RLIMIT_NOFILE) failed: %m\n");
}
}
/* These chroot setup functions put the TTY at at "/console" (where it
won't be found by ttyname), and create "/dev/console" as an
ordinary file. This way, it's easier to write test-cases that
@ -266,6 +293,7 @@ do_in_chroot_1 (int (*cb)(const char *, int))
if (strncmp (slavename, "/dev/pts/", 9) != 0)
FAIL_UNSUPPORTED ("slave pseudo-terminal is not under /dev/pts/: %s",
slavename);
adjust_file_limit (slavename);
int slave = xopen (slavename, O_RDWR, 0);
if (!doit (slave, "basic smoketest",
(struct result_r){.name=slavename, .ret=0, .err=0}))
@ -332,6 +360,7 @@ do_in_chroot_2 (int (*cb)(const char *, int))
if (strncmp (slavename, "/dev/pts/", 9) != 0)
FAIL_UNSUPPORTED ("slave pseudo-terminal is not under /dev/pts/: %s",
slavename);
adjust_file_limit (slavename);
/* wait until in a new mount ns to open the slave */
/* enable `wait`ing on grandchildren */
@ -445,10 +474,20 @@ run_chroot_tests (const char *slavename, int slave)
ok = false;
VERIFY (umount ("/dev/console") == 0);
/* keep creating PTYs until we we get a name collision */
while (stat (slavename, &st) < 0)
posix_openpt (O_RDWR|O_NOCTTY|O_NONBLOCK);
VERIFY (stat (slavename, &st) == 0);
/* Keep creating PTYs until we we get a name collision. */
while (true)
{
if (stat (slavename, &st) == 0)
break;
if (posix_openpt (O_RDWR|O_NOCTTY|O_NONBLOCK) < 0)
{
if (errno == ENOSPC || errno == EMFILE || errno == ENFILE)
FAIL_UNSUPPORTED ("cannot re-create PTY \"%s\" in chroot: %m"
" (consider increasing limits)", slavename);
else
FAIL_EXIT1 ("cannot re-create PTY \"%s\" chroot: %m", slavename);
}
}
if (!doit (slave, "conflict, no match",
(struct result_r){.name=NULL, .ret=ENODEV, .err=ENODEV}))