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Work around race conditions when semaphore gets deleted by parent process (#217)

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Wolfgang Hommel
2019-11-20 08:43:24 +01:00
parent a0fe6b56b0
commit 22f8c3dd36
1 changed files with 23 additions and 4 deletions
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27
src/libfaketime.c
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@@ -413,6 +413,7 @@ static void ft_shm_init (void)
int ticks_shm_fd;
char sem_name[256], shm_name[256], *ft_shared_env = getenv("FAKETIME_SHARED");
sem_t *shared_semR = NULL;
static int nt=1;
/* create semaphore and shared memory locally unless it has been passed along */
if (ft_shared_env == NULL)
@@ -451,10 +452,28 @@ static void ft_shm_init (void)
if (SEM_FAILED == (shared_sem = sem_open(sem_name, 0)))
{
perror("libfaketime: In ft_shm_init(), sem_open failed");
fprintf(stderr, "libfaketime: sem_name was %s, created locally: %s\n", sem_name, shmCreator ? "true":"false");
fprintf(stderr, "libfaketime: parsed from env: %s\n", ft_shared_env);
exit(1);
if (shmCreator)
{
perror("libfaketime: In ft_shm_init(), sem_open failed");
fprintf(stderr, "libfaketime: sem_name was %s, created locally: %s\n", sem_name, shmCreator ? "true":"false");
fprintf(stderr, "libfaketime: parsed from env: %s\n", ft_shared_env);
exit(1);
}
else
{
nt++;
if (nt > 3)
{
perror("libfaketime: In ft_shm_init(), sem_open failed and recreation attempts failed");
fprintf(stderr, "libfaketime: sem_name was %s, created locally: %s\n", sem_name, shmCreator ? "true":"false");
exit(1);
}
else{
ft_shm_init();
return;
}
}
}
if (-1 == (ticks_shm_fd = shm_open(shm_name, O_CREAT|O_RDWR, S_IWUSR|S_IRUSR)))