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authorFlorian Weimer <fweimer@redhat.com>2019-01-04 12:12:17 +0100
committerFlorian Weimer <fweimer@redhat.com>2019-01-04 12:12:17 +0100
commit4392898d8c348625681581728aa558733e578f07 (patch)
treede2def2b9daee7be9fdf67989723366848ef3889
parentce7eb0e90315eb1939ac29f656d39b3db858c092 (diff)
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Linux: Improve handling of resource limits in misc/tst-ttyname
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.
-rw-r--r--ChangeLog9
-rw-r--r--sysdeps/unix/sysv/linux/tst-ttyname.c47
2 files changed, 52 insertions, 4 deletions
diff --git a/ChangeLog b/ChangeLog
index c7b2feb..72cf61f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -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
diff --git a/sysdeps/unix/sysv/linux/tst-ttyname.c b/sysdeps/unix/sysv/linux/tst-ttyname.c
index 5d2a54f..6822b57 100644
--- a/sysdeps/unix/sysv/linux/tst-ttyname.c
+++ b/sysdeps/unix/sysv/linux/tst-ttyname.c
@@ -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}))