On 2012年08月09日 18:30, Kang Kai wrote:
Hi Wanlong,
> In this test case, it uses a variable to share data between child and
> parent processes. But after fork there is a copy of the variable in
> child process and modify it will not affect the variable in the parent
> process. Then when the child process call mq_open() before parent process,
> the case will fail.
>
> Use tmp file to replace the variable. Any modification in child process
> can be seen in parent process.
Any comment for this patch?
Thanks,
Kai
>
> Signed-off-by: Kang Kai<kai.k...@windriver.com>
> ---
> .../conformance/interfaces/mq_open/16-1.c | 38
> +++++++++++++++++--
> 1 files changed, 34 insertions(+), 4 deletions(-)
>
> diff --git
> a/testcases/open_posix_testsuite/conformance/interfaces/mq_open/16-1.c
> b/testcases/open_posix_testsuite/conformance/interfaces/mq_open/16-1.c
> index b9a3215..ebd697b 100644
> --- a/testcases/open_posix_testsuite/conformance/interfaces/mq_open/16-1.c
> +++ b/testcases/open_posix_testsuite/conformance/interfaces/mq_open/16-1.c
> @@ -20,9 +20,11 @@
> * this is fine (will have some false positives, but no false negatives).
> */
>
> +#include<sys/mman.h>
> #include<sys/stat.h>
> #include<sys/types.h>
> #include<sys/wait.h>
> +#include<errno.h>
> #include<fcntl.h>
> #include<mqueue.h>
> #include<signal.h>
> @@ -32,11 +34,15 @@
> #include "posixtest.h"
>
> #define NAMESIZE 50
> +#define TNAME "mq_open/16-1.c"
>
> int main()
> {
> char qname[NAMESIZE];
> + char fname[NAMESIZE];
> int pid, succeeded=0;
> + int fd;
> + void *pa = NULL;
> mqd_t childqueue, queue;
>
> /*
> @@ -47,6 +53,26 @@ int main()
>
> sprintf(qname, "/mq_open_16-1_%d", getpid());
>
> + sprintf(fname, "/tmp/pts_mq_open_16_1_%d", getpid());
> + unlink(fname);
> + fd = open(fname, O_CREAT | O_RDWR | O_EXCL,
> + S_IRUSR | S_IWUSR);
> + if (fd == -1) {
> + printf(TNAME " Error at open(): %s\n", strerror(errno));
> + exit(PTS_UNRESOLVED);
> + }
> + /* file is empty now, will cause "Bus error" */
> + write(fd, "\0", 1);
> + unlink(fname);
> +
> + pa = mmap(NULL, sizeof(int), PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
> + if (pa == MAP_FAILED) {
> + printf(TNAME " Error at mmap: %s\n", strerror(errno));
> + close(fd);
> + exit(PTS_FAIL);
> + }
> + *(int *)pa = 0;
> +
> if ((pid = fork()) == 0) {
> sigset_t mask;
> int sig;
> @@ -62,7 +88,7 @@ int main()
> childqueue = mq_open(qname, O_CREAT|O_EXCL|O_RDWR,
> S_IRUSR | S_IWUSR, NULL);
> if (childqueue != (mqd_t)-1) {
> - succeeded++;
> + ++*(int *)pa;
> #ifdef DEBUG
> printf("mq_open() in child succeeded\n");
> } else {
> @@ -79,7 +105,7 @@ int main()
> queue = mq_open(qname, O_CREAT | O_EXCL |O_RDWR,
> S_IRUSR | S_IWUSR, NULL);
> if (queue != (mqd_t)-1) {
> - succeeded++;
> + ++*(int *)pa;
> #ifdef DEBUG
> printf("mq_open() in parent succeeded\n");
> } else {
> @@ -93,13 +119,15 @@ int main()
> mq_close(queue);
> mq_close(childqueue);
> mq_unlink(qname);
> + close(fd);
> + munmap(pa, sizeof(int));
> return PTS_UNRESOLVED;
> }
>
> mq_close(queue);
> mq_close(childqueue);
> mq_unlink(qname);
> -
> + succeeded = *(int *)pa;
> if (succeeded==0) {
> printf("Test FAILED - mq_open() never succeeded\n");
> return PTS_FAIL;
> @@ -111,8 +139,10 @@ int main()
> }
>
> printf("Test PASSED\n");
> + close(fd);
> + munmap(pa, sizeof(int));
> return PTS_PASS;
> }
>
> return PTS_UNRESOLVED;
> -}
> \ No newline at end of file
> +}
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