Fix: getenv can return null

[lttng-tools.git] / src / common / compat / poll.h

diff --git a/src/common/compat/poll.h b/src/common/compat/poll.h
index f892c832333eb10bdfcc4cf64d66918c17d3ab02..d4bd87f589213fbace764f2f2d3d152551d5ab5a 100644 (file)
--- a/src/common/compat/poll.h
+++ b/src/common/compat/poll.h
@@ -73,7 +73,7 @@ enum {
        LPOLLNVAL = EPOLLHUP,
        LPOLLRDHUP = EPOLLRDHUP,
        /* Close on exec feature of epoll */
-#if __GLIBC_PREREQ(2, 9)
+#if defined(HAVE_EPOLL_CREATE1) && defined(EPOLL_CLOEXEC)
        LTTNG_CLOEXEC = EPOLL_CLOEXEC,
 #else
        /*
@@ -127,7 +127,7 @@ extern int compat_epoll_create(struct lttng_poll_event *events,
 #define lttng_poll_create(events, size, flags) \
        compat_epoll_create(events, size, flags)
 
-#if __GLIBC_PREREQ(2, 9)
+#if defined(HAVE_EPOLL_CREATE1) && defined(EPOLL_CLOEXEC)
 static inline int compat_glibc_epoll_create(int size __attribute__((unused)),
                int flags)
 {
@@ -171,10 +171,18 @@ extern int compat_epoll_del(struct lttng_poll_event *events, int fd);
 #define lttng_poll_del(events, fd) \
        compat_epoll_del(events, fd)
 
+/*
+ * Modify an fd's events in the epoll set.
+ */
+extern int compat_epoll_mod(struct lttng_poll_event *events,
+               int fd, uint32_t req_events);
+#define lttng_poll_mod(events, fd, req_events) \
+       compat_epoll_add(events, fd, req_events)
+
 /*
  * Set up the poll set limits variable poll_max_size
  */
-extern void compat_epoll_set_max_size(void);
+extern int compat_epoll_set_max_size(void);
 #define lttng_poll_set_max_size() \
        compat_epoll_set_max_size()
 
@@ -217,7 +225,7 @@ static inline void lttng_poll_clean(struct lttng_poll_event *events)
        if (events->epfd >= 0) {
                ret = close(events->epfd);
                if (ret) {
-                       perror("close");
+                       PERROR("close");
                }
        }
 
@@ -254,7 +262,7 @@ enum {
 #if __linux__
        LPOLLMSG = POLLMSG,
        LPOLLRDHUP = POLLRDHUP,
-#elif (defined(__FreeBSD__) || defined(__CYGWIN__))
+#elif (defined(__FreeBSD__) || defined(__CYGWIN__) || defined(__sun__) || defined(__APPLE__))
        LPOLLMSG = 0,
        LPOLLRDHUP = 0,
 #else
@@ -285,8 +293,7 @@ struct compat_poll_event {
         * execution before a poll wait is done.
         */
        struct compat_poll_event_array current;
-       /* Indicate if wait.events needs to be realloc. */
-       int need_realloc:1;
+
        /* Indicate if wait.events need to be updated from current. */
        int need_update:1;
 };
@@ -348,10 +355,18 @@ extern int compat_poll_del(struct lttng_poll_event *events, int fd);
 #define lttng_poll_del(events, fd) \
        compat_poll_del(events, fd)
 
+/*
+ * Modify an fd's events in the epoll set.
+ */
+extern int compat_poll_mod(struct lttng_poll_event *events,
+               int fd, uint32_t req_events);
+#define lttng_poll_mod(events, fd, req_events) \
+       compat_poll_add(events, fd, req_events)
+
 /*
  * Set up the poll set limits variable poll_max_size
  */
-extern void compat_poll_set_max_size(void);
+extern int compat_poll_set_max_size(void);
 #define lttng_poll_set_max_size() \
        compat_poll_set_max_size()