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T: simplify

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Don't use shm anymore. Use mmap directly.
This commit is contained in:
Cedric Roux
2018-08-13 11:28:56 +02:00
parent 781133b772
commit f18a438c2c
3 changed files with 40 additions and 57 deletions
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common/utils/T/T.c
+31 -26
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@@ -91,7 +91,7 @@ static void new_thread(void *(*f)(void *), void *data)
/* defined in local_tracer.c */
void T_local_tracer_main(int remote_port, int wait_for_tracer,
int local_socket, char *shm_file);
int local_socket, void *shm_array);
/* We monitor the tracee and the local tracer processes.
* When one dies we forcefully kill the other.
@@ -114,22 +114,31 @@ void T_init(int remote_port, int wait_for_tracer, int dont_fork)
{
int socket_pair[2];
int s;
int T_shm_fd;
int child1, child2;
char shm_file[128];
sprintf(shm_file, "/%s%d", T_SHM_FILENAME, getpid());
int i;
if (socketpair(AF_UNIX, SOCK_STREAM, 0, socket_pair))
{ perror("socketpair"); abort(); }
/* setup shared memory */
T_cache = mmap(NULL, T_CACHE_SIZE * sizeof(T_cache_t),
PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
if (T_cache == MAP_FAILED)
{ perror("mmap"); abort(); }
/* let's garbage the memory to catch some potential problems
* (think multiprocessor sync issues, barriers, etc.)
*/
memset(T_cache, 0x55, T_CACHE_SIZE * sizeof(T_cache_t));
for (i = 0; i < T_CACHE_SIZE; i++) T_cache[i].busy = 0;
/* child1 runs the local tracer and child2 (or main) runs the tracee */
child1 = fork(); if (child1 == -1) abort();
if (child1 == 0) {
close(socket_pair[1]);
T_local_tracer_main(remote_port, wait_for_tracer, socket_pair[0],
shm_file);
T_cache);
exit(0);
}
close(socket_pair[0]);
@@ -138,6 +147,7 @@ void T_init(int remote_port, int wait_for_tracer, int dont_fork)
child2 = fork(); if (child2 == -1) abort();
if (child2 != 0) {
close(socket_pair[1]);
munmap(T_cache, T_CACHE_SIZE * sizeof(T_cache_t));
monitor_and_kill(child1, child2);
}
}
@@ -148,34 +158,29 @@ void T_init(int remote_port, int wait_for_tracer, int dont_fork)
T_socket = s;
/* setup shared memory */
T_shm_fd = shm_open(shm_file, O_RDWR /*| O_SYNC*/, 0666);
shm_unlink(shm_file);
if (T_shm_fd == -1) { perror(shm_file); abort(); }
T_cache = mmap(NULL, T_CACHE_SIZE * sizeof(T_cache_t),
PROT_READ | PROT_WRITE, MAP_SHARED, T_shm_fd, 0);
if (T_cache == MAP_FAILED)
{ perror(shm_file); abort(); }
close(T_shm_fd);
new_thread(T_receive_thread, NULL);
}
void T_Config_Init(void)
{
int T_port; /* by default we wait for the tracer */
int T_nowait; /* default port to listen to to wait for the tracer */
int T_dont_fork; /* default is to fork, see 'T_init' to understand */
int T_port; /* by default we wait for the tracer */
int T_nowait; /* default port to listen to to wait for the tracer */
int T_dont_fork; /* default is to fork, see 'T_init' to understand */
paramdef_t ttraceparams[] = CMDLINE_TTRACEPARAMS_DESC ;
paramdef_t ttraceparams[] = CMDLINE_TTRACEPARAMS_DESC;
/* for a cleaner config file, TTracer params should be defined in a specific section... */
config_get( ttraceparams,sizeof(ttraceparams)/sizeof(paramdef_t),TTRACER_CONFIG_PREFIX);
/* for a cleaner config file, TTracer params should be defined in a
* specific section...
*/
config_get(ttraceparams,
sizeof(ttraceparams) / sizeof(paramdef_t),
TTRACER_CONFIG_PREFIX);
/* compatibility: look for TTracer command line options in root section */
config_process_cmdline( ttraceparams,sizeof(ttraceparams)/sizeof(paramdef_t),NULL);
/* compatibility: look for TTracer command line options in root section */
config_process_cmdline(ttraceparams,
sizeof(ttraceparams) / sizeof(paramdef_t),
NULL);
if (T_stdout == 0) {
if (T_stdout == 0)
T_init(T_port, 1-T_nowait, T_dont_fork);
}
}