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/* Copyright (c) 2001-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "dovecot-version.h"
#include "array.h"
#include "event-filter.h"
#include "env-util.h"
#include "hostpid.h"
#include "ipwd.h"
#include "process-title.h"
#include "restrict-access.h"
#include "var-expand-private.h"
#include "randgen.h"
#include <fcntl.h>
#include <unistd.h>
#include <sys/time.h>
/* Mainly for including the full version information in core dumps.
NOTE: Don't set this const - otherwise it won't end up in core dumps. */
char dovecot_build_info[] = DOVECOT_BUILD_INFO;
static bool lib_initialized = FALSE;
int dev_null_fd = -1;
struct atexit_callback {
int priority;
lib_atexit_callback_t *callback;
};
static ARRAY(struct atexit_callback) atexit_callbacks = ARRAY_INIT;
static bool lib_clean_exit;
#undef i_unlink
int i_unlink(const char *path, const char *source_fname,
unsigned int source_linenum)
{
if (unlink(path) < 0) {
i_error("unlink(%s) failed: %m (in %s:%u)",
path, source_fname, source_linenum);
return -1;
}
return 0;
}
#undef i_unlink_if_exists
int i_unlink_if_exists(const char *path, const char *source_fname,
unsigned int source_linenum)
{
if (unlink(path) == 0)
return 1;
else if (errno == ENOENT)
return 0;
else {
i_error("unlink(%s) failed: %m (in %s:%u)",
path, source_fname, source_linenum);
return -1;
}
}
void i_getopt_reset(void)
{
#ifdef __GLIBC__
/* a) for subcommands allow -options anywhere in command line
b) this is actually required for the reset to work (glibc bug?) */
optind = 0;
#else
optind = 1;
#endif
}
void lib_atexit(lib_atexit_callback_t *callback)
{
lib_atexit_priority(callback, 0);
}
void lib_atexit_priority(lib_atexit_callback_t *callback, int priority)
{
struct atexit_callback *cb;
const struct atexit_callback *callbacks;
unsigned int i, count;
if (!array_is_created(&atexit_callbacks))
i_array_init(&atexit_callbacks, 8);
else {
/* skip if it's already added */
callbacks = array_get(&atexit_callbacks, &count);
for (i = count; i > 0; i--) {
if (callbacks[i-1].callback == callback) {
i_assert(callbacks[i-1].priority == priority);
return;
}
}
}
cb = array_append_space(&atexit_callbacks);
cb->priority = priority;
cb->callback = callback;
}
static int atexit_callback_priority_cmp(const struct atexit_callback *cb1,
const struct atexit_callback *cb2)
{
return cb1->priority - cb2->priority;
}
void lib_atexit_run(void)
{
const struct atexit_callback *cb;
if (array_is_created(&atexit_callbacks)) {
array_sort(&atexit_callbacks, atexit_callback_priority_cmp);
array_foreach(&atexit_callbacks, cb)
(*cb->callback)();
array_free(&atexit_callbacks);
}
}
static void lib_open_non_stdio_dev_null(void)
{
dev_null_fd = open("/dev/null", O_WRONLY);
if (dev_null_fd == -1)
i_fatal("open(/dev/null) failed: %m");
/* Make sure stdin, stdout and stderr fds exist. We especially rely on
stderr being available and a lot of code doesn't like fd being 0.
We'll open /dev/null as write-only also for stdin, since if any
reads are attempted from it we'll want them to fail. */
while (dev_null_fd < STDERR_FILENO) {
dev_null_fd = dup(dev_null_fd);
if (dev_null_fd == -1)
i_fatal("dup(/dev/null) failed: %m");
}
/* close the actual /dev/null fd on exec*(), but keep it in stdio fds */
fd_close_on_exec(dev_null_fd, TRUE);
}
void lib_set_clean_exit(bool set)
{
lib_clean_exit = set;
}
void lib_exit(int status)
{
lib_set_clean_exit(TRUE);
exit(status);
}
static void lib_atexit_handler(void)
{
/* We're already in exit code path. Avoid using any functions that
might cause strange breakage. Especially anything that could call
exit() again could cause infinite looping in some OSes. */
if (!lib_clean_exit) {
const char *error = "Unexpected exit - converting to abort\n";
if (write(STDERR_FILENO, error, strlen(error)) < 0) {
/* ignore */
}
abort();
}
}
void lib_init(void)
{
i_assert(!lib_initialized);
random_init();
data_stack_init();
hostpid_init();
lib_open_non_stdio_dev_null();
lib_event_init();
event_filter_init();
var_expand_extensions_init();
/* Default to clean exit. Otherwise there would be too many accidents
with e.g. command line parsing errors that try to return instead
of using lib_exit(). master_service_init_finish() will change this
again to be FALSE. */
lib_set_clean_exit(TRUE);
atexit(lib_atexit_handler);
lib_initialized = TRUE;
}
bool lib_is_initialized(void)
{
return lib_initialized;
}
void lib_deinit(void)
{
i_assert(lib_initialized);
lib_initialized = FALSE;
lib_atexit_run();
ipwd_deinit();
hostpid_deinit();
var_expand_extensions_deinit();
event_filter_deinit();
data_stack_deinit_event();
lib_event_deinit();
restrict_access_deinit();
i_close_fd(&dev_null_fd);
data_stack_deinit();
failures_deinit();
process_title_deinit();
random_deinit();
lib_clean_exit = TRUE;
}
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