configure.ac: extend checks for header, functions, etc.

[paraslash.git] / stdin.c

diff --git a/stdin.c b/stdin.c
index 6b9c80988b365c76fe77e8a470004e2398739d5f..d9f9bd936590985bf32a8351738bbf875c4a5478 100644 (file)
--- a/stdin.c
+++ b/stdin.c
@@ -1,3 +1,11 @@
+/*
+ * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
+ *
+ * Licensed under the GPL v2. For licencing details see COPYING.
+ */
+
+/** \file stdin.c functions that deal with reading from stdin */
+
 #include "para.h"
 #include "string.h"
 #include "list.h"
@@ -6,21 +14,51 @@
 #include "error.h"
 #include "stdin.h"
 
+/**
+ * the pre_select function of the stdin task
+ *
+ * \param s the scheduler this task was registered to
+ * \param t the task structure of the stdin task
+ *
+ * This function is always successful. If there is space left in the
+ * buffer of the stdin task, it adds \p STDIN_FILENO to the read fd set
+ * of \a s.
+ */
 void stdin_pre_select(struct sched *s, struct task *t)
 {
        struct stdin_task *sit = t->private_data;
-       if (sit->loaded < sit->bufsize)
-               para_fd_set(STDIN_FILENO, &s->rfds, &s->max_fileno);
-       t->ret = 1; /* success */
+       t->ret = 1;
+       sit->check_fd = 0;
+       if (sit->loaded >= sit->bufsize)
+               return;
+       sit->check_fd = 1;
+       para_fd_set(STDIN_FILENO, &s->rfds, &s->max_fileno);
+}
+
+static void stdin_default_event_handler(struct task *t)
+{
+       PARA_NOTICE_LOG("%p: %s\n", t, PARA_STRERROR(-t->ret));
+       unregister_task(t);
 }
 
+/**
+ * the post select function of the stdin task
+ *
+ * \param s the scheduler this task was registered to
+ * \param t the task structure of the stdin task
+ *
+ * This function checks if \p STDIN_FILENO was included by in the read fd set
+ * of \a s during the previous pre_select call.  If yes, and \p STDIN_FILENO
+ * appeears to be readable, data is read from stdin into the buffer of the
+ * stdin task.
+ */
 void stdin_post_select(struct sched *s, struct task *t)
 {
        struct stdin_task *sit = t->private_data;
        ssize_t ret;
 
        t->ret = 1;
-       if (sit->loaded >= sit->bufsize)
+       if (!sit->check_fd)
                return;
        if (!FD_ISSET(STDIN_FILENO, &s->rfds))
                return;
@@ -31,10 +69,30 @@ void stdin_post_select(struct sched *s, struct task *t)
                sit->loaded += ret;
                t->ret = ret;
        } else
-               t->ret = 0;
-       if (ret <= 0)
+               t->ret = -E_STDIN_EOF;
+       if (t->ret < 0)
                sit->eof = 1;
-       sprintf(t->status,
-               "%p stdin reader: loaded = %d, ret = %d",
-               sit, sit->loaded, t->ret);
+}
+
+/**
+ * initialize a stdin task structure with default values
+ *
+ * \param sit the stdin task structure
+ *
+ * This fills in the pre/post select function poinzters of the task structure
+ * given by \a sot. It also sets up a default error handler which unregisters
+ * the task. Moreover, \a loaded and \a eof are set to zero and \a bufsize is
+ * initialized to 16 KB (but no buffer is allocated).
+ */
+void stdin_set_defaults(struct stdin_task *sit)
+{
+       sit->bufsize = 16 * 1024,
+       sit->loaded = 0,
+       sit->eof = 0,
+       sit->task.pre_select = stdin_pre_select;
+       sit->task.post_select = stdin_post_select;
+       sit->task.event_handler = stdin_default_event_handler;
+       sit->task.private_data = sit;
+       mark_fd_nonblock(STDIN_FILENO);
+       sprintf(sit->task.status, "stdin reader");
 }