- ein bild sagt mehr als tausend worte

[software/libev.git] / ev.3

diff --git a/ev.3 b/ev.3
index d718a09ff67dabad5e108b5f0dd3956da3279786..6c36997c8f6933d9fe531e2b85f2aca4e47c7227 100644 (file)
--- a/ev.3
+++ b/ev.3
@@ -134,9 +134,65 @@
 libev \- a high performance full\-featured event loop written in C
 .SH "SYNOPSIS"
 .IX Header "SYNOPSIS"
-.Vb 1
+.Vb 2
+\&  /* this is the only header you need */
 \&  #include <ev.h>
 .Ve
+.PP
+.Vb 3
+\&  /* what follows is a fully working example program */
+\&  ev_io stdin_watcher;
+\&  ev_timer timeout_watcher;
+.Ve
+.PP
+.Vb 8
+\&  /* called when data readable on stdin */
+\&  static void
+\&  stdin_cb (EV_P_ struct ev_io *w, int revents)
+\&  {
+\&    /* puts ("stdin ready"); */
+\&    ev_io_stop (EV_A_ w); /* just a syntax example */
+\&    ev_unloop (EV_A_ EVUNLOOP_ALL); /* leave all loop calls */
+\&  }
+.Ve
+.PP
+.Vb 6
+\&  static void
+\&  timeout_cb (EV_P_ struct ev_timer *w, int revents)
+\&  {
+\&    /* puts ("timeout"); */
+\&    ev_unloop (EV_A_ EVUNLOOP_ONE); /* leave one loop call */
+\&  }
+.Ve
+.PP
+.Vb 4
+\&  int
+\&  main (void)
+\&  {
+\&    struct ev_loop *loop = ev_default_loop (0);
+.Ve
+.PP
+.Vb 3
+\&    /* initialise an io watcher, then start it */
+\&    ev_io_init (&stdin_watcher, stdin_cb, /*STDIN_FILENO*/ 0, EV_READ);
+\&    ev_io_start (loop, &stdin_watcher);
+.Ve
+.PP
+.Vb 3
+\&    /* simple non-repeating 5.5 second timeout */
+\&    ev_timer_init (&timeout_watcher, timeout_cb, 5.5, 0.);
+\&    ev_timer_start (loop, &timeout_watcher);
+.Ve
+.PP
+.Vb 2
+\&    /* loop till timeout or data ready */
+\&    ev_loop (loop, 0);
+.Ve
+.PP
+.Vb 2
+\&    return 0;
+\&  }
+.Ve
 .SH "DESCRIPTION"
 .IX Header "DESCRIPTION"
 Libev is an event loop: you register interest in certain events (such as a
@@ -242,13 +298,13 @@ might be supported on the current system, you would need to look at
 recommended ones.
 .Sp
 See the description of \f(CW\*(C`ev_embed\*(C'\fR watchers for more info.
-.IP "ev_set_allocator (void *(*cb)(void *ptr, long size))" 4
-.IX Item "ev_set_allocator (void *(*cb)(void *ptr, long size))"
-Sets the allocation function to use (the prototype is similar to the
-realloc C function, the semantics are identical). It is used to allocate
-and free memory (no surprises here). If it returns zero when memory
-needs to be allocated, the library might abort or take some potentially
-destructive action. The default is your system realloc function.
+.IP "ev_set_allocator (void *(*cb)(void *ptr, size_t size))" 4
+.IX Item "ev_set_allocator (void *(*cb)(void *ptr, size_t size))"
+Sets the allocation function to use (the prototype and semantics are
+identical to the realloc C function). It is used to allocate and free
+memory (no surprises here). If it returns zero when memory needs to be
+allocated, the library might abort or take some potentially destructive
+action. The default is your system realloc function.
 .Sp
 You could override this function in high-availability programs to, say,
 free some memory if it cannot allocate memory, to use a special allocator,
@@ -259,7 +315,7 @@ retries: better than mine).
 .Sp
 .Vb 6
 \&   static void *
-\&   persistent_realloc (void *ptr, long size)
+\&   persistent_realloc (void *ptr, size_t size)
 \&   {
 \&     for (;;)
 \&       {