+++ /dev/null
-/*
- * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; only version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
- * Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
-#include <fcntl.h>
-#include <limits.h>
-#include <stdlib.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <unistd.h>
-#include <config.h>
-
-#include <lttngerr.h>
-
-#include "poll.h"
-
-unsigned int poll_max_size;
-
-/*
- * Create epoll set and allocate returned events structure.
- */
-int compat_epoll_create(struct lttng_poll_event *events, int size, int flags)
-{
- int ret;
-
- if (events == NULL || size <= 0) {
- goto error;
- }
-
- /* Don't bust the limit here */
- if (size > poll_max_size) {
- size = poll_max_size;
- }
-
- ret = epoll_create1(flags);
- if (ret < 0) {
- /* At this point, every error is fatal */
- perror("epoll_create1");
- goto error;
- }
-
- events->epfd = ret;
-
- /* This *must* be freed by using lttng_poll_free() */
- events->events = zmalloc(size * sizeof(struct epoll_event));
- if (events->events == NULL) {
- perror("malloc epoll set");
- goto error_close;
- }
-
- events->events_size = size;
- events->nb_fd = 0;
-
- return 0;
-
-error_close:
- close(events->epfd);
-error:
- return -1;
-}
-
-/*
- * Add a fd to the epoll set with requesting events.
- */
-int compat_epoll_add(struct lttng_poll_event *events, int fd, uint32_t req_events)
-{
- int ret, new_size;
- struct epoll_event ev, *ptr;
-
- if (events == NULL || events->events == NULL || fd < 0) {
- ERR("Bad compat epoll add arguments");
- goto error;
- }
-
- ev.events = req_events;
- ev.data.fd = fd;
-
- ret = epoll_ctl(events->epfd, EPOLL_CTL_ADD, fd, &ev);
- if (ret < 0) {
- switch (errno) {
- case EEXIST:
- case ENOSPC:
- case EPERM:
- /* Print perror and goto end not failing. Show must go on. */
- perror("epoll_ctl ADD");
- goto end;
- default:
- perror("epoll_ctl ADD fatal");
- goto error;
- }
- }
-
- events->nb_fd++;
-
- if (events->nb_fd >= events->events_size) {
- new_size = 2 * events->events_size;
- ptr = realloc(events->events, new_size * sizeof(struct epoll_event));
- if (ptr == NULL) {
- perror("realloc epoll add");
- goto error;
- }
- events->events = ptr;
- events->events_size = new_size;
- }
-
-end:
- return 0;
-
-error:
- return -1;
-}
-
-/*
- * Remove a fd from the epoll set.
- */
-int compat_epoll_del(struct lttng_poll_event *events, int fd)
-{
- int ret;
-
- if (events == NULL || fd < 0) {
- goto error;
- }
-
- ret = epoll_ctl(events->epfd, EPOLL_CTL_DEL, fd, NULL);
- if (ret < 0) {
- switch (errno) {
- case ENOENT:
- case EPERM:
- /* Print perror and goto end not failing. Show must go on. */
- perror("epoll_ctl DEL");
- goto end;
- default:
- perror("epoll_ctl DEL fatal");
- goto error;
- }
- perror("epoll_ctl del");
- goto error;
- }
-
- events->nb_fd--;
-
-end:
- return 0;
-
-error:
- return -1;
-}
-
-/*
- * Wait on epoll set. This is a blocking call of timeout value.
- */
-int compat_epoll_wait(struct lttng_poll_event *events, int timeout)
-{
- int ret;
-
- if (events == NULL || events->events == NULL ||
- events->events_size < events->nb_fd) {
- ERR("Wrong arguments in compat_epoll_wait");
- goto error;
- }
-
- do {
- ret = epoll_wait(events->epfd, events->events, events->nb_fd, timeout);
- } while (ret == -1 && errno == EINTR);
- if (ret < 0) {
- /* At this point, every error is fatal */
- perror("epoll_wait");
- goto error;
- }
-
- return ret;
-
-error:
- return -1;
-}
-
-/*
- * Setup poll set maximum size.
- */
-void compat_epoll_set_max_size(void)
-{
- int ret, fd;
- char buf[64];
-
- poll_max_size = LTTNG_POLL_DEFAULT_SIZE;
-
- fd = open(LTTNG_EPOLL_PROC_PATH, O_RDONLY);
- if (fd < 0) {
- return;
- }
-
- ret = read(fd, buf, sizeof(buf));
- if (ret < 0) {
- perror("read set max size");
- goto error;
- }
-
- poll_max_size = atoi(buf);
- if (poll_max_size <= 0) {
- /* Extra precaution */
- poll_max_size = LTTNG_POLL_DEFAULT_SIZE;
- }
-
- DBG("epoll set max size is %d", poll_max_size);
-
-error:
- close(fd);
-}
projects / lttng-tools.git / blobdiff