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Teach fifo_io how to use ioctl(FIONREAD) to determine if a fifo is

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readable, and use that in addition to poll+select+kqueue to verify
appropriate readability.
This commit is contained in:
Robert Watson 2005-09-13 15:49:12 +00:00
parent a30c1e0a0b
commit f8f8772ade
1 changed files with 95 additions and 6 deletions
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101
tools/regression/fifo/fifo_io/fifo_io.c
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@ -28,6 +28,7 @@
#include <sys/types.h>
#include <sys/event.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <sys/time.h>
@ -66,16 +67,15 @@
* - That once 512k (ish) is read from the other end, the blocked writer
* wakes up.
*
* - When a fifo is empty, poll and select report it is writable but not
* readable.
* - When a fifo is empty, poll, select, kqueue, and fionread report it is
* writable but not readable.
*
* - When a fifo has data in it, poll and select report that it is writable.
* - When a fifo has data in it, poll, select, and kqueue report that it is
* writable.
*
* - XXX: blocked reader semantics?
*
* - XXX: behavior on remote close?
*
* - XXX: kqueue
* - XXX: event behavior on remote close?
*/
/*
@ -971,6 +971,23 @@ kqueue_status(int kqueue_fd, int fd, int *readable, int *writable,
return (0);
}
static int
fionread_status(int fd, int *readable, const char *testname)
{
int i;
if (ioctl(fd, FIONREAD, &i) < 0) {
warn("%s: ioctl(FIONREAD)", testname);
return (-1);
}
if (i > 0)
*readable = 1;
else
*readable = 0;
return (0);
}
/*
* test_events() uses poll(), select(), and kevent() to query the status of
* fifo file descriptors and determine whether they match expected state
@ -1044,6 +1061,18 @@ test_events_outofbox(void)
exit(-1);
}
if (fionread_status(reader_fd, &readable, __func__) < 0) {
cleanfifokq("testfifo", reader_fd, writer_fd, kqueue_fd);
exit(-1);
}
if (readable) {
warnx("test_events_outofbox: reader_fd fionread r:%d on "
"create", readable);
cleanfifokq("testfifo", reader_fd, writer_fd, kqueue_fd);
exit(-1);
}
/*
* Make sure that fresh, out-of-the-box fifo file descriptors have
* good initial states. The writer_fd should be ready to write.
@ -1087,6 +1116,18 @@ test_events_outofbox(void)
exit(-1);
}
if (fionread_status(writer_fd, &readable, __func__) < 0) {
cleanfifokq("testfifo", reader_fd, writer_fd, kqueue_fd);
exit(-1);
}
if (readable) {
warnx("test_events_outofbox: writer_fd fionread r:%d on "
"create", readable);
cleanfifokq("testfifo", reader_fd, writer_fd, kqueue_fd);
exit(-1);
}
cleanfifokq("testfifo", reader_fd, writer_fd, kqueue_fd);
}
@ -1162,6 +1203,18 @@ test_events_write_read_byte(void)
exit(-1);
}
if (fionread_status(reader_fd, &readable, __func__) < 0) {
cleanfifokq("testfifo", reader_fd, writer_fd, kqueue_fd);
exit(-1);
}
if (!readable) {
warnx("test_events_outofbox: reader_fd fionread r:%d after "
"write", readable);
cleanfifokq("testfifo", reader_fd, writer_fd, kqueue_fd);
exit(-1);
}
/*
* Now the writer_fd.
*/
@ -1204,6 +1257,18 @@ test_events_write_read_byte(void)
exit(-1);
}
if (fionread_status(writer_fd, &readable, __func__) < 0) {
cleanfifokq("testfifo", reader_fd, writer_fd, kqueue_fd);
exit(-1);
}
if (readable) {
warnx("test_events_outofbox: writer_fd fionread r:%d after "
"write", readable);
cleanfifokq("testfifo", reader_fd, writer_fd, kqueue_fd);
exit(-1);
}
/*
* Read the byte from the reader_fd, and now confirm that that fifo
* becomes unreadable.
@ -1257,6 +1322,18 @@ test_events_write_read_byte(void)
exit(-1);
}
if (fionread_status(reader_fd, &readable, __func__) < 0) {
cleanfifokq("testfifo", reader_fd, writer_fd, kqueue_fd);
exit(-1);
}
if (readable) {
warnx("test_events_outofbox: reader_fd fionread r:%d after "
"write+read", readable);
cleanfifokq("testfifo", reader_fd, writer_fd, kqueue_fd);
exit(-1);
}
/*
* Now the writer_fd.
*/
@ -1302,6 +1379,18 @@ test_events_write_read_byte(void)
exit(-1);
}
if (fionread_status(writer_fd, &readable, __func__) < 0) {
cleanfifokq("testfifo", reader_fd, writer_fd, kqueue_fd);
exit(-1);
}
if (readable) {
warnx("test_events_outofbox: writer_fd fionread r:%d after "
"write+read", readable);
cleanfifokq("testfifo", reader_fd, writer_fd, kqueue_fd);
exit(-1);
}
cleanfifokq("testfifo", reader_fd, writer_fd, kqueue_fd);
}