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shm node: add option to spawn external program on start

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This commit is contained in:
Georg Reinke 2017-04-12 17:07:59 +02:00
parent 39d7c451fb
commit 385efa1313
4 changed files with 40 additions and 1 deletions
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1
include/villas/nodes/shmem.h
View file

@ -15,6 +15,7 @@ struct shmem {
int insize, outsize; /**< Size of ingoing and outgoing queue, respectively. */
int cond_out; /**< Whether to use a pthread_cond_t to signal if new samples are written to outqueue. */
int cond_in; /**< Whether to use a pthread_cond_t to signal if new samples are written to inqueue. */
char **exec; /**< External program to execute on start. */
struct memtype *manager; /**< Manager for the shared memory region. */
int fd; /**< Handle as returned by shm_open().*/

2
include/villas/utils.h
View file

@ -245,3 +245,5 @@ void signals_init(void (*cb)(int signal, siginfo_t *sinfo, void *ctx));
* @retval 0 Everything was okay.
*/
int sha1sum(FILE *f, unsigned char *sha1);
pid_t spawn(const char* name, char **argv);

18
lib/nodes/shmem.c
View file

@ -28,6 +28,22 @@ int shmem_parse(struct node *n, config_setting_t *cfg) {
shm->cond_out = false;
if (!config_setting_lookup_bool(cfg, "cond_in", &shm->cond_in))
shm->cond_in = false;
config_setting_t *exec_setting = config_setting_lookup(cfg, "exec");
if (!exec_setting) {
shm->exec = NULL;
} else {
if (!config_setting_is_array(exec_setting))
cerror(exec_setting, "Invalid format for exec");
shm->exec = malloc(sizeof(char*) * (config_setting_length(exec_setting) + 1));
int i;
for (i = 0; i < config_setting_length(exec_setting); i++) {
const char* elm = config_setting_get_string_elem(exec_setting, i);
if (!elm)
cerror(exec_setting, "Invalid format for exec");
shm->exec[i] = strdup(elm);
}
shm->exec[i] = NULL;
}
return 0;
}
@ -73,6 +89,8 @@ int shmem_open(struct node *n) {
if (pool_init(&shm->shared->pool, shm->insize+shm->outsize, SAMPLE_LEN(shm->sample_size), shm->manager) < 0)
error("Shm pool allocation failed (not enough memory?)");
if (shm->exec && !spawn(shm->exec[0], shm->exec))
serror("Failed to spawn external program");
return 0;
}

20
lib/utils.c
View file

@ -411,6 +411,11 @@ void signals_init(void (*cb)(int signal, siginfo_t *sinfo, void *ctx))
sigemptyset(&sa_quit.sa_mask);
sigaction(SIGINT, &sa_quit, NULL);
sigaction(SIGTERM, &sa_quit, NULL);
struct sigaction sa_chld = {
.sa_flags = 0,
.sa_handler = SIG_IGN
};
sigaction(SIGCHLD, &sa_chld, NULL);
}
int sha1sum(FILE *f, unsigned char *sha1)
@ -436,4 +441,17 @@ int sha1sum(FILE *f, unsigned char *sha1)
fseek(f, seek, SEEK_SET);
return 0;
}
}
pid_t
spawn(const char* name, char **argv) {
pid_t pid = fork();
switch(pid) {
case -1:
return -1;
case 0:
return execvp(name, argv);
default:
return pid;
}
}