Re: [Qemu-devel] [PATCH v7 12/54] tests/tcg/multiarch: don't hard code paths/ports for linux-test

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

On 06/18/2018 12:18 PM, Philippe Mathieu-Daudé wrote:
> On 06/17/2018 06:18 AM, Alex Bennée wrote:
>> Philippe Mathieu-Daudé <f4bug@amsat.org> writes:
>>
>>> Hi Alex,
>>>
>>> On 06/15/2018 04:46 PM, Alex Bennée wrote:
>>>> The fixed path and ports get in the way of running our tests and
>>>> builds in parallel. Instead of using TESTPATH we use mkdtemp() and
>>>> instead of a fixed port we allow the kernel to assign one and query it
>>>> afterwards.
>>>>
>>>> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
>>>> ---
>>>>  tests/tcg/multiarch/linux-test.c | 37 ++++++++++++++++----------------
>>>>  1 file changed, 19 insertions(+), 18 deletions(-)
>>>>
>>>> diff --git a/tests/tcg/multiarch/linux-test.c b/tests/tcg/multiarch/linux-test.c
>>>> index 6f2c531474..3f73b96420 100644
>>>> --- a/tests/tcg/multiarch/linux-test.c
>>>> +++ b/tests/tcg/multiarch/linux-test.c
>>>> @@ -41,8 +41,6 @@
>>>>  #include <setjmp.h>
>>>>  #include <sys/shm.h>
>>>>
>>>> -#define TESTPATH "/tmp/linux-test.tmp"
>>>> -#define TESTPORT 7654
>>>>  #define STACK_SIZE 16384
>>>>
>>>>  static void error1(const char *filename, int line, const char *fmt, ...)
>>>> @@ -85,19 +83,15 @@ static void test_file(void)
>>>>      struct iovec vecs[2];
>>>>      DIR *dir;
>>>>      struct dirent *de;
>>>> +    char template[] = "/tmp/linux-test-XXXXXX";
>>>
>>> Since /tmp doesn't always fit, can this be:
>>>
>>>        char *tmpbase = getenv("TMPDIR");
>>>        char *template = g_strdup_printf("%s/qemu-test-XXXXXX",
>>>                                         tmpbase ? tmpbase : "/tmp");
>>
>> It depends if we want to honour TMPDIR, is /tmp not likely to be there?
> 
> My /tmp is a not huge tmpfs and I had troubles running iotests which let
> some dangling big files on failure. Now I prefer run tests with
> TMPDIR=/scratch where I have plenty of slower space.
> Shouldn't be a problem here however.

Thus is something that could be addressed in later patch, or not.

> 
>>
>> Either way we can't use glib functions for these tests to keep the
>> compilation simple.
> 
> char template[PATH_MAX] + snprintf() :)
> 
>>
>>>
>>>> +    char *tmpdir = mkdtemp(template);
>>>
>>>        g_free(template);
>>>
>>>>
>>>> -    /* clean up, just in case */
>>>> -    unlink(TESTPATH "/file1");
>>>> -    unlink(TESTPATH "/file2");
>>>> -    unlink(TESTPATH "/file3");
>>>> -    rmdir(TESTPATH);
>>>> +    chk_error(strlen(tmpdir));
>>>>
>>>>      if (getcwd(cur_dir, sizeof(cur_dir)) == NULL)
>>>>          error("getcwd");
>>>>
>>>> -    chk_error(mkdir(TESTPATH, 0755));
>>>> -
>>>> -    chk_error(chdir(TESTPATH));
>>>> +    chk_error(chdir(tmpdir));
>>>>
>>>>      /* open/read/write/close/readv/writev/lseek */
>>>>
>>>> @@ -163,7 +157,7 @@ static void test_file(void)
>>>>          st.st_mtime != 1000)
>>>>          error("stat time");
>>>>
>>>> -    chk_error(stat(TESTPATH, &st));
>>>> +    chk_error(stat(tmpdir, &st));
>>>>      if (!S_ISDIR(st.st_mode))
>>>>          error("stat mode");
>>>>
>>>> @@ -185,7 +179,7 @@ static void test_file(void)
>>>>          error("stat mode");
>>>>
>>>>      /* getdents */
>>>> -    dir = opendir(TESTPATH);
>>>> +    dir = opendir(tmpdir);
>>>>      if (!dir)
>>>>          error("opendir");
>>>>      len = 0;
>>>> @@ -207,7 +201,7 @@ static void test_file(void)
>>>>      chk_error(unlink("file3"));
>>>>      chk_error(unlink("file2"));
>>>>      chk_error(chdir(cur_dir));
>>>> -    chk_error(rmdir(TESTPATH));
>>>> +    chk_error(rmdir(tmpdir));
>>>>  }
>>>>
>>>>  static void test_fork(void)
>>>> @@ -264,7 +258,7 @@ static int server_socket(void)
>>>>      chk_error(setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)));
>>>>
>>>>      sockaddr.sin_family = AF_INET;
>>>> -    sockaddr.sin_port = htons(TESTPORT);
>>>> +    sockaddr.sin_port = htons(0); /* choose random ephemeral port) */
>>>>      sockaddr.sin_addr.s_addr = 0;
>>>>      chk_error(bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)));
>>>>      chk_error(listen(fd, 0));
>>>> @@ -272,7 +266,7 @@ static int server_socket(void)
>>>>
>>>>  }
>>>>
>>>> -static int client_socket(void)
>>>> +static int client_socket(uint16_t port)
>>>>  {
>>>>      int fd;
>>>>      struct sockaddr_in sockaddr;
>>>> @@ -280,7 +274,7 @@ static int client_socket(void)
>>>>      /* server socket */
>>>>      fd = chk_error(socket(PF_INET, SOCK_STREAM, 0));
>>>>      sockaddr.sin_family = AF_INET;
>>>> -    sockaddr.sin_port = htons(TESTPORT);
>>>> +    sockaddr.sin_port = htons(port);
>>>>      inet_aton("127.0.0.1", &sockaddr.sin_addr);
>>>>      chk_error(connect(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)));
>>>>      return fd;
>>>> @@ -292,10 +286,17 @@ static void test_socket(void)
>>>>  {
>>>>      int server_fd, client_fd, fd, pid, ret, val;
>>>>      struct sockaddr_in sockaddr;
>>>> -    socklen_t len;
>>>> +    struct sockaddr_in server_addr;
>>>> +    socklen_t len, socklen;
>>>> +    uint16_t server_port;
>>>>      char buf[512];
>>>>
>>>>      server_fd = server_socket();
>>>> +    /* find out what port we got */
>>>> +    socklen = sizeof(server_addr);
>>>> +    ret = getsockname(server_fd, &server_addr, &socklen);
>>>> +    chk_error(ret);
>>>> +    server_port = ntohs(server_addr.sin_port);
>>>>
>>>>      /* test a few socket options */
>>>>      len = sizeof(val);
>>>> @@ -305,7 +306,7 @@ static void test_socket(void)
>>>>
>>>>      pid = chk_error(fork());
>>>>      if (pid == 0) {
>>>> -        client_fd = client_socket();
>>>> +        client_fd = client_socket(server_port);
>>>>          send(client_fd, socket_msg, sizeof(socket_msg), 0);
>>>>          close(client_fd);
>>>>          exit(0);
>>>>
>>
>>
>> --
>> Alex Bennée
>>