5 #include <sys/select.h>
9 #define BIG_PIPE_SIZE 64*1024 /* From sys/pipe.h */
12 * Test for the non-blocking big pipe bug (write(2) returning
13 * EAGAIN while select(2) returns the descriptor as ready for write).
18 void write_frame(int fd, char *buf, unsigned long buflen)
26 i = select(fd+1, NULL, &wfd, NULL, NULL);
32 fprintf(stderr, "select returned unexpected value %d\n", i);
35 i = write(fd, buf, buflen);
48 char buf[BIG_PIPE_SIZE]; /* any value over PIPE_SIZE should do */
53 if (pipe(fd) < 0) { perror("pipe"); exit(1); }
55 flags = fcntl(fd[1], F_GETFL);
56 if (flags == -1 || fcntl(fd[1], F_SETFL, flags|O_NONBLOCK) == -1) {
68 i = read(fd[0], buf, 256); /* any small size should do */
70 if (i < 0) { perror("read"); exit(1); }
78 memset(buf, 0, sizeof buf);
79 for (i = 0; i < 1000; i++) write_frame(fd[1], buf, sizeof buf);