shm tests: Append PID to names passed to shm_open [BZ #26737]

  Append PID to names passed to shm_open in shm tests to avoid random

FAIL: rt/tst-shm-cancel
FAIL: rt/tst-shm

due to the same name passed to shm_open and shm_unlink when more than
one "make check" running in parallel on the same machine.
---
 rt/tst-shm-cancel.c | 11 ++++++++++-
 rt/tst-shm.c        | 35 +++++++++++++++++++++++++----------
 2 files changed, 35 insertions(+), 11 deletions(-)
  

On 15/10/2020 15:06, H.J. Lu wrote:
> Append PID to names passed to shm_open in shm tests to avoid random
> 
> FAIL: rt/tst-shm-cancel
> FAIL: rt/tst-shm
> 
> due to the same name passed to shm_open and shm_unlink when more than
> one "make check" running in parallel on the same machine.

LGTM, thanks.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

> ---
>  rt/tst-shm-cancel.c | 11 ++++++++++-
>  rt/tst-shm.c        | 35 +++++++++++++++++++++++++----------
>  2 files changed, 35 insertions(+), 11 deletions(-)
> 
> diff --git a/rt/tst-shm-cancel.c b/rt/tst-shm-cancel.c
> index e787229ab2..67d8ce86d5 100644
> --- a/rt/tst-shm-cancel.c
> +++ b/rt/tst-shm-cancel.c
> @@ -26,7 +26,14 @@
>  #include <stdlib.h>
>  
>  static sem_t sem;	/* Use to sync with thread start.  */
> -static const char shm_name[] = "/glibc-shm_open-cancel";
> +static char shm_name[sizeof "/glibc-shm_open-cancel-" + sizeof (pid_t) * 3];
> +
> +static void
> +init_shm_name (void)
> +{
> +  snprintf (shm_name, sizeof (shm_name), "/glibc-shm_open-cancel-%u",
> +	    getpid ());
> +}
>  
>  static void
>  remove_shm (int status, void *arg)

Ok.

> @@ -86,6 +93,8 @@ do_test (void)
>  {
>    pthread_t td;
>  
> +  init_shm_name ();
> +
>    if (sem_init (&sem, 0, 0))
>      {
>        printf ("error: sem_init failed: %m\n");

Ok.

> diff --git a/rt/tst-shm.c b/rt/tst-shm.c
> index 37a0ba5a50..5f866132d3 100644
> --- a/rt/tst-shm.c
> +++ b/rt/tst-shm.c
> @@ -34,13 +34,26 @@
>  /* We want to see output immediately.  */
>  #define STDOUT_UNBUFFERED
>  
> +static char shm_test_name[sizeof "/glibc-shm-test-" + sizeof (pid_t) * 3];
> +static char shm_escape_name[sizeof "/../escaped-" + sizeof (pid_t) * 3];
> +
> +static void
> +init_shm_test_names (void)
> +{
> +  snprintf (shm_test_name, sizeof (shm_test_name), "/glibc-shm-test-%u",
> +	    getpid ());
> +  snprintf (shm_escape_name, sizeof (shm_escape_name), "/../escaped-%u",
> +	    getpid ());
> +}
> +

Ok.

>  static void
>  worker (int write_now)
>  {
>    struct timespec ts;
>    struct stat64 st;
>    int i;
> -  int fd = shm_open ("/glibc-shm-test", O_RDWR, 0600);
> +
> +  int fd = shm_open (shm_test_name, O_RDWR, 0600);
>  
>    if (fd == -1)
>      error (EXIT_FAILURE, 0, "failed to open shared memory object: shm_open");

Ok.

> @@ -117,7 +130,9 @@ do_test (void)
>    int status2;
>    struct stat64 st;
>  
> -  fd = shm_open ("/../escaped", O_RDWR | O_CREAT | O_TRUNC | O_EXCL, 0600);
> +  init_shm_test_names ();
> +
> +  fd = shm_open (shm_escape_name, O_RDWR | O_CREAT | O_TRUNC | O_EXCL, 0600);
>    if (fd != -1)
>      {
>        perror ("read file outside of SHMDIR directory");

Ok.

> @@ -126,7 +141,7 @@ do_test (void)
>  
>  
>    /* Create the shared memory object.  */
> -  fd = shm_open ("/glibc-shm-test", O_RDWR | O_CREAT | O_TRUNC | O_EXCL, 0600);
> +  fd = shm_open (shm_test_name, O_RDWR | O_CREAT | O_TRUNC | O_EXCL, 0600);
>    if (fd == -1)
>      {
>        /* If shm_open is unimplemented we skip the test.  */

Ok.

> @@ -146,18 +161,18 @@ do_test (void)
>           shared memory itself.  */
>        perror ("failed to size of shared memory object: ftruncate");
>        close (fd);
> -      shm_unlink ("/glibc-shm-test");
> +      shm_unlink (shm_test_name);
>        return 0;
>      }
>  
>    if (fstat64 (fd, &st) == -1)
>      {
> -      shm_unlink ("/glibc-shm-test");
> +      shm_unlink (shm_test_name);
>        error (EXIT_FAILURE, 0, "initial stat failed");
>      }
>    if (st.st_size != 4000)
>      {
> -      shm_unlink ("/glibc-shm-test");
> +      shm_unlink (shm_test_name);
>        error (EXIT_FAILURE, 0, "initial size not correct");
>      }
>  
> @@ -170,7 +185,7 @@ do_test (void)
>        /* Couldn't create a second process.  */
>        perror ("fork");
>        close (fd);
> -      shm_unlink ("/glibc-shm-test");
> +      shm_unlink (shm_test_name);
>        return 0;
>      }
>  
> @@ -185,7 +200,7 @@ do_test (void)
>        kill (pid1, SIGTERM);
>        waitpid (pid1, &ignore, 0);
>        close (fd);
> -      shm_unlink ("/glibc-shm-test");
> +      shm_unlink (shm_test_name);
>        return 0;
>      }
>  

Ok.

> @@ -194,7 +209,7 @@ do_test (void)
>    waitpid (pid2, &status2, 0);
>  
>    /* Now we can unlink the shared object.  */
> -  shm_unlink ("/glibc-shm-test");
> +  shm_unlink (shm_test_name);
>  
>    return (!WIFEXITED (status1) || WEXITSTATUS (status1) != 0
>  	  || !WIFEXITED (status2) || WEXITSTATUS (status2) != 0);
> @@ -203,7 +218,7 @@ do_test (void)
>  static void
>  cleanup_handler (void)
>  {
> -  shm_unlink ("/glibc-shm-test");
> +  shm_unlink (shm_test_name);
>  }
>  
>  #define CLEANUP_HANDLER cleanup_handler
> 

Ok.