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1. #include <stdio.h>
2. #include <unistd.h>
3. #include <errno.h>
4. #include <time.h>
5. #include <sys/time.h>
6. #include <signal.h>
7. #include <poll.h>
8. #include <sys/types.h>
9. #include <error.h>
10.
11. void call_poll(void)
12. {
13. struct pollfd fds;
14. int32_t timeout_msecs = 5000;
15. int err;
16.
17. fds.fd = 1;
18. fds.events = POLLIN | POLLPRI ;
19. err = poll( &fds, 1, timeout_msecs );
20. if ( err > 0 ) {
21. printf(\"Data is available now.\\n\");
22. }
23. else if ( err == 0 ) {
24. printf(\"No data within five seconds.\\n\");
25. }
26. else {
27. perror( \"poll()\" );
28. }
29.
30. }
31. #include <sys/epoll.h>
32.
33. void call_epoll(void)
34. {
35. int epfd;
36. struct epoll_event ev_stdin;
37. int err;
38.
39. epfd = epoll_create(1);
40. if ( epfd < 0 ) {
41. perror( \"epoll_create()\" );
42. return ;
43. }
44.
45. bzero( &ev_stdin, sizeof( struct epoll_event) );
46. ev_stdin.events =
47. // available for read operations
48. EPOLLIN | EPOLLPRI
49. // available for write operations
50. // | EPOLLOUT
51. // Error condition && Hang up happened
52. | EPOLLERR | EPOLLHUP
53. // Sets the Edge Triggered behaviour
54. | EPOLLET
55. // Sets the one-shot behaviour.
56. // must call epoll_ctl with EPOLL_CTL_MOD to re-enable
57. | EPOLLONESHOT
58. ;
59.
60. err = epoll_ctl( epfd, EPOLL_CTL_ADD, 1, &ev_stdin );
61. if ( err < 0 ) {
62. perror( \"epoll_ctl()\" );
63. goto _out;
64. }
65. err = epoll_wait( epfd, &ev_stdin, 1, 5000 );
66. if ( err < 0 ) {
67. perror( \"epoll_wait()\" );
68. }
69. else if ( err == 0 ) {
70. printf(\"No data within five seconds.\\n\");
71. }
72. else {
73. printf(\"Data is available now.\\n\");
74. }
75. //err = epoll_ctl( epfd, EPOLL_CTL_DEL, 1, &ev_stdin );
76. //
77. err = epoll_ctl( epfd, EPOLL_CTL_DEL, 1, &ev_stdin );
78. if ( err < 0 ) {
79. perror( \"epoll_ctl()\" );
80. }
81. _out:
82. close( epfd );
83. }
84. int main ()
85. {
86. call_epoll();
87. return 0;
88. } |
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发表于 2009-8-6 14:23:27