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/*
* SPDX-FileCopyrightText: 2015 Jérémie Galarneau <jeremie.galarneau@efficios.com>
*
* SPDX-License-Identifier: LGPL-2.1-only
*
*/
#include "utils.h"
#include <common/compat/errno.hpp>
#include <common/compat/time.hpp>
#include <common/macros.hpp>
#include <common/time.hpp>
#include <fcntl.h>
#include <poll.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
int64_t elapsed_time_ns(struct timespec *t1, struct timespec *t2)
{
struct timespec delta;
LTTNG_ASSERT(t1 && t2);
delta.tv_sec = t2->tv_sec - t1->tv_sec;
delta.tv_nsec = t2->tv_nsec - t1->tv_nsec;
return ((int64_t) NSEC_PER_SEC * (int64_t) delta.tv_sec) + (int64_t) delta.tv_nsec;
}
int usleep_safe(useconds_t usec)
{
int ret = 0;
struct timespec t1, t2;
int64_t time_remaining_ns = (int64_t) usec * (int64_t) NSEC_PER_USEC;
ret = lttng_clock_gettime(CLOCK_MONOTONIC, &t1);
if (ret) {
ret = -1;
perror("clock_gettime");
goto end;
}
while (time_remaining_ns > 0) {
ret = usleep(time_remaining_ns / (int64_t) NSEC_PER_USEC);
if (ret && errno != EINTR) {
perror("usleep");
goto end;
}
ret = lttng_clock_gettime(CLOCK_MONOTONIC, &t2);
if (ret) {
perror("clock_gettime");
goto end;
}
time_remaining_ns -= elapsed_time_ns(&t1, &t2);
}
end:
return ret;
}
int create_file(const char *path)
{
int ret;
if (!path) {
return -1;
}
ret = creat(path, S_IRWXU);
if (ret < 0) {
perror("creat");
return -1;
}
ret = close(ret);
if (ret < 0) {
perror("close");
return -1;
}
return 0;
}
int delete_file(const char *path)
{
int ret;
if (!path) {
return -1;
}
ret = unlink(path);
if (ret < 0) {
perror("unlink");
return -1;
}
return 0;
}
int wait_on_file(const char *path)
{
int ret;
struct stat buf;
if (!path) {
return -1;
}
for (;;) {
ret = stat(path, &buf);
if (ret == -1 && errno == ENOENT) {
ret = poll(nullptr, 0, 10); /* 10 ms delay */
/* Should return 0 everytime */
if (ret) {
if (ret < 0) {
perror("perror");
} else {
fprintf(stderr, "poll return value is larger than zero\n");
}
return -1;
}
continue; /* retry */
}
if (ret) {
perror("stat");
return -1;
}
break; /* found */
}
return 0;
}
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