+++ /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.
- */
-
-#ifndef _LTT_POLL_H
-#define _LTT_POLL_H
-
-#include <string.h>
-#include <unistd.h>
-
-#include <lttng-share.h>
-
-/*
- * Value taken from the hard limit allowed by the kernel when using setrlimit
- * with RLIMIT_NOFILE on an Intel i7 CPU and Linux 3.0.3.
- */
-#define LTTNG_POLL_DEFAULT_SIZE 65535
-
-/*
- * Maximum number of fd we can monitor.
- *
- * For epoll(7), /proc/sys/fs/epoll/max_user_watches (since Linux 2.6.28) will
- * be used for the maximum size of the poll set. If this interface is not
- * available, according to the manpage, the max_user_watches value is 1/25 (4%)
- * of the available low memory divided by the registration cost in bytes which
- * is 90 bytes on a 32-bit kernel and 160 bytes on a 64-bit kernel.
- *
- * For poll(2), the max fds must not exceed RLIMIT_NOFILE given by
- * getrlimit(2).
- */
-extern unsigned int poll_max_size;
-
-/*
- * Used by lttng_poll_clean to free the events structure in a lttng_poll_event.
- */
-static inline void __lttng_poll_free(void *events)
-{
- free(events);
-}
-
-/*
- * epoll(7) implementation.
- */
-#ifdef HAVE_EPOLL
-#include <sys/epoll.h>
-
-/* See man epoll(7) for this define path */
-#define LTTNG_EPOLL_PROC_PATH "/proc/sys/fs/epoll/max_user_watches"
-
-enum {
- /* Polling variables compatibility for epoll */
- LPOLLIN = EPOLLIN,
- LPOLLPRI = EPOLLPRI,
- LPOLLOUT = EPOLLOUT,
- LPOLLRDNORM = EPOLLRDNORM,
- LPOLLRDBAND = EPOLLRDBAND,
- LPOLLWRNORM = EPOLLWRNORM,
- LPOLLWRBAND = EPOLLWRBAND,
- LPOLLMSG = EPOLLMSG,
- LPOLLERR = EPOLLERR,
- LPOLLHUP = EPOLLHUP,
- LPOLLNVAL = EPOLLHUP,
- LPOLLRDHUP = EPOLLRDHUP,
- /* Close on exec feature of epoll */
- LTTNG_CLOEXEC = EPOLL_CLOEXEC,
-};
-
-struct compat_epoll_event {
- int epfd;
- uint32_t nb_fd; /* Current number of fd in events */
- uint32_t events_size; /* Size of events array */
- struct epoll_event *events;
-};
-#define lttng_poll_event compat_epoll_event
-
-/*
- * For the following calls, consider 'e' to be a lttng_poll_event pointer and i
- * being the index of the events array.
- */
-#define LTTNG_POLL_GETFD(e, i) LTTNG_REF(e)->events[i].data.fd
-#define LTTNG_POLL_GETEV(e, i) LTTNG_REF(e)->events[i].events
-#define LTTNG_POLL_GETNB(e) LTTNG_REF(e)->nb_fd
-#define LTTNG_POLL_GETSZ(e) LTTNG_REF(e)->events_size
-
-/*
- * Create the epoll set. No memory allocation is done here.
- */
-extern int compat_epoll_create(struct lttng_poll_event *events,
- int size, int flags);
-#define lttng_poll_create(events, size, flags) \
- compat_epoll_create(events, size, flags);
-
-/*
- * Wait on epoll set with the number of fd registered to the lttng_poll_event
- * data structure (events).
- */
-extern int compat_epoll_wait(struct lttng_poll_event *events, int timeout);
-#define lttng_poll_wait(events, timeout) \
- compat_epoll_wait(events, timeout);
-
-/*
- * Add a fd to the epoll set and resize the epoll_event structure if needed.
- */
-extern int compat_epoll_add(struct lttng_poll_event *events,
- int fd, uint32_t req_events);
-#define lttng_poll_add(events, fd, req_events) \
- compat_epoll_add(events, fd, req_events);
-
-/*
- * Remove a fd from the epoll set.
- */
-extern int compat_epoll_del(struct lttng_poll_event *events, int fd);
-#define lttng_poll_del(events, fd) \
- compat_epoll_del(events, fd);
-
-/*
- * Set up the poll set limits variable poll_max_size
- */
-extern void compat_epoll_set_max_size(void);
-#define lttng_poll_set_max_size(void) \
- compat_epoll_set_max_size(void);
-
-/*
- * This function memset with zero the structure since it can be reused at each
- * round of a main loop. Being in a loop and using a non static number of fds,
- * this function must be called to insure coherent events with associted fds.
- */
-static inline void lttng_poll_reset(struct lttng_poll_event *events)
-{
- if (events && events->events) {
- memset(events->events, 0,
- events->nb_fd * sizeof(struct epoll_event));
- }
-}
-
-/*
- * Clean the events structure of a lttng_poll_event. It's the caller
- * responsability to free the lttng_poll_event memory.
- */
-static inline void lttng_poll_clean(struct lttng_poll_event *events)
-{
- if (events) {
- close(events->epfd);
- __lttng_poll_free((void *) events->events);
- }
-}
-
-#else /* HAVE_EPOLL */
-/*
- * Fallback on poll(2) API
- */
-
-/* Needed for some poll event values */
-#ifndef __USE_XOPEN
-#define __USE_XOPEN
-#endif
-
-/* Needed for some poll event values */
-#ifndef __USE_GNU
-#define __USE_GNU
-#endif
-
-#include <poll.h>
-#include <stdint.h>
-
-enum {
- /* Polling variables compatibility for poll */
- LPOLLIN = POLLIN,
- LPOLLPRI = POLLPRI,
- LPOLLOUT = POLLOUT,
- LPOLLRDNORM = POLLRDNORM,
- LPOLLRDBAND = POLLRDBAND,
- LPOLLWRNORM = POLLWRNORM,
- LPOLLWRBAND = POLLWRBAND,
- LPOLLMSG = POLLMSG,
- LPOLLERR = POLLERR,
- LPOLLHUP = POLLHUP | POLLNVAL,
- LPOLLRDHUP = POLLRDHUP,
- /* Close on exec feature does not exist for poll(2) */
- LTTNG_CLOEXEC = 0xdead,
-};
-
-struct compat_poll_event {
- uint32_t nb_fd; /* Current number of fd in events */
- uint32_t events_size; /* Size of events array */
- struct pollfd *events;
-};
-#define lttng_poll_event compat_poll_event
-
-/*
- * For the following calls, consider 'e' to be a lttng_poll_event pointer and i
- * being the index of the events array.
- */
-#define LTTNG_POLL_GETFD(e, i) LTTNG_REF(e)->events[i].fd
-#define LTTNG_POLL_GETEV(e, i) LTTNG_REF(e)->events[i].revents
-#define LTTNG_POLL_GETNB(e) LTTNG_REF(e)->nb_fd
-#define LTTNG_POLL_GETSZ(e) LTTNG_REF(e)->events_size
-
-/*
- * Create a pollfd structure of size 'size'.
- */
-extern int compat_poll_create(struct lttng_poll_event *events, int size);
-#define lttng_poll_create(events, size, flags) \
- compat_poll_create(events, size);
-
-/*
- * Wait on poll(2) event with nb_fd registered to the lttng_poll_event data
- * structure.
- */
-extern int compat_poll_wait(struct lttng_poll_event *events, int timeout);
-#define lttng_poll_wait(events, timeout) \
- compat_poll_wait(events, timeout);
-
-/*
- * Add the fd to the pollfd structure. Resize if needed.
- */
-extern int compat_poll_add(struct lttng_poll_event *events,
- int fd, uint32_t req_events);
-#define lttng_poll_add(events, fd, req_events) \
- compat_poll_add(events, fd, req_events);
-
-/*
- * Remove the fd from the pollfd. Memory allocation is done to recreate a new
- * pollfd, data is copied from the old pollfd to the new and, finally, the old
- * one is freed().
- */
-extern int compat_poll_del(struct lttng_poll_event *events, int fd);
-#define lttng_poll_del(events, fd) \
- compat_poll_del(events, fd);
-
-/*
- * Set up the poll set limits variable poll_max_size
- */
-extern void compat_poll_set_max_size(void);
-#define lttng_poll_set_max_size(void) \
- compat_poll_set_max_size(void);
-
-/*
- * No need to reset a pollfd structure for poll(2)
- */
-static inline void lttng_poll_reset(struct lttng_poll_event *events)
-{}
-
-/*
- * Clean the events structure of a lttng_poll_event. It's the caller
- * responsability to free the lttng_poll_event memory.
- */
-static inline void lttng_poll_clean(struct lttng_poll_event *events)
-{
- if (events) {
- __lttng_poll_free((void *) events->events);
- }
-}
-
-#endif /* HAVE_EPOLL */
-
-#endif /* _LTT_POLL_H */
projects / lttng-tools.git / blobdiff