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ctdb-daemon: Add ctdb_vfork_with_logging()

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This will be used to spawn lightweight helper processes to run
eventscripts.

Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Martin Schwenke <martin@meltin.net>
This commit is contained in:
Amitay Isaacs 2013-12-16 15:39:29 +11:00 committed by Martin Schwenke
parent 7aa20ccb5c
commit 2879404388
2 changed files with 87 additions and 0 deletions
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9
ctdb/include/ctdb_private.h
View File

@ -1461,6 +1461,15 @@ struct ctdb_log_state *ctdb_fork_with_logging(TALLOC_CTX *mem_ctx,
const char *log_prefix,
void (*logfn)(const char *, uint16_t, void *),
void *logfn_private, pid_t *pid);
struct ctdb_log_state *ctdb_vfork_with_logging(TALLOC_CTX *mem_ctx,
struct ctdb_context *ctdb,
const char *log_prefix,
const char *helper,
int helper_argc,
const char **helper_argv,
void (*logfn)(const char *, uint16_t, void *),
void *logfn_private, pid_t *pid);
int32_t ctdb_control_process_exists(struct ctdb_context *ctdb, pid_t pid);
struct ctdb_client *ctdb_find_client_by_pid(struct ctdb_context *ctdb, pid_t pid);

78
ctdb/server/ctdb_logging.c
View File

@ -528,6 +528,84 @@ free_log:
return NULL;
}
/*
* vfork + exec, redirecting child output to logging and specified callback.
*/
struct ctdb_log_state *ctdb_vfork_with_logging(TALLOC_CTX *mem_ctx,
struct ctdb_context *ctdb,
const char *log_prefix,
const char *helper,
int helper_argc,
const char **helper_argv,
void (*logfn)(const char *, uint16_t, void *),
void *logfn_private, pid_t *pid)
{
int p[2];
struct ctdb_log_state *log;
struct tevent_fd *fde;
char **argv;
int i;
log = talloc_zero(mem_ctx, struct ctdb_log_state);
CTDB_NO_MEMORY_NULL(ctdb, log);
log->ctdb = ctdb;
log->prefix = log_prefix;
log->logfn = logfn;
log->logfn_private = logfn_private;
if (pipe(p) != 0) {
DEBUG(DEBUG_ERR, (__location__ " Failed to setup pipe for child logging\n"));
goto free_log;
}
argv = talloc_array(mem_ctx, char *, helper_argc + 2);
if (argv == NULL) {
DEBUG(DEBUG_ERR, (__location__ "Failed to allocate memory for helper\n"));
goto free_log;
}
argv[0] = discard_const(helper);
argv[1] = talloc_asprintf(argv, "%d", p[1]);
if (argv[1] == NULL) {
DEBUG(DEBUG_ERR, (__location__ "Failed to allocate memory for helper\n"));
talloc_free(argv);
goto free_log;
}
for (i=0; i<helper_argc; i++) {
argv[i+2] = discard_const(helper_argv[i]);
}
*pid = vfork();
if (*pid == 0) {
execv(helper, argv);
_exit(1);
}
close(p[1]);
if (*pid < 0) {
DEBUG(DEBUG_ERR, (__location__ "vfork failed for helper process\n"));
close(p[0]);
goto free_log;
}
ctdb_track_child(ctdb, *pid);
log->pfd = p[0];
set_close_on_exec(log->pfd);
talloc_set_destructor(log, log_context_destructor);
fde = tevent_add_fd(ctdb->ev, log, log->pfd, EVENT_FD_READ,
ctdb_log_handler, log);
tevent_fd_set_auto_close(fde);
return log;
free_log:
talloc_free(log);
return NULL;
}
/*
setup for logging of child process stdout
*/