stdin.c

   1 #include "para.h"
   2 #include "string.h"
   3 #include "list.h"
   4 #include "sched.h"
   5 #include "fd.h"
   6 #include "error.h"
   7 #include "stdin.h"
   8
   9 void stdin_pre_select(struct sched *s, struct task *t)
  10 {
  11         struct stdin_task *sit = t->private_data;
  12         if (sit->loaded < sit->bufsize)
  13                 para_fd_set(STDIN_FILENO, &s->rfds, &s->max_fileno);
  14         t->ret = 1; /* success */
  15 }
  16
  17 static void stdin_default_event_handler(struct task *t)
  18 {
  19         PARA_NOTICE_LOG("%p: %s\n", t, PARA_STRERROR(-t->ret));
  20         unregister_task(t);
  21 }
  22
  23 void stdin_post_select(struct sched *s, struct task *t)
  24 {
  25         struct stdin_task *sit = t->private_data;
  26         ssize_t ret;
  27
  28         t->ret = 1;
  29         if (sit->loaded >= sit->bufsize)
  30                 return;
  31         if (!FD_ISSET(STDIN_FILENO, &s->rfds))
  32                 return;
  33         ret = read(STDIN_FILENO, sit->buf + sit->loaded, sit->bufsize - sit->loaded);
  34         if (ret < 0)
  35                 t->ret = -E_STDIN_READ;
  36         else if (ret > 0) {
  37                 sit->loaded += ret;
  38                 t->ret = ret;
  39         } else
  40                 t->ret = -E_STDIN_EOF;
  41         if (t->ret < 0)
  42                 sit->eof = 1;
  43 }
  44
  45 void stdin_set_defaults(struct stdin_task *sit)
  46 {
  47         sit->bufsize = 16 * 1024,
  48         sit->loaded = 0,
  49         sit->eof = 0,
  50         sit->task.flags = 0,
  51         sit->task.pre_select = stdin_pre_select;
  52         sit->task.post_select = stdin_post_select;
  53         sit->task.event_handler = stdin_default_event_handler;
  54         sit->task.private_data = sit;
  55         sprintf(sit->task.status, "stdin reader");
  56 }