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pollhup

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This commit is contained in:
Ciro Santilli 2017-05-23 07:12:27 +01:00
parent 3ef4d2d85c
commit 3f864a41c8
1 changed files with 9 additions and 3 deletions
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12
posix/interactive/poll.c
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@ -1,4 +1,6 @@
/*
https://stackoverflow.com/questions/5857461/poll-function-to-watch-named-pipes/44126952#44126952
sudo mknod poll0.tmp p
sudo mknod poll1.tmp p
sudo chmod 666 poll*.tmp
@ -12,10 +14,12 @@ In another shell:
Now the first shell contains:
loop
i=0 n=1 buf=a
POLLIN i=0 n=1 buf=a
loop
POLLHUP i=0
loop
i=1 n=1 buf=b
POLLIN i=1 n=1 buf=b
POLLHUP i=1
loop
Cooler example:
@ -69,9 +73,11 @@ int main(void) {
revents = pfds[i].revents;
if (revents & POLLIN) {
n = read(pfds[i].fd, buf, sizeof(buf));
printf("i=%d n=%d buf=%.*s\n", i, n, n, buf);
printf("POLLIN i=%d n=%d buf=%.*s\n", i, n, n, buf);
}
if (revents & POLLHUP) {
printf("POLLHUP i=%d\n", i);
/* This happens when the other side closed.
* This event is only cleared when we close the reader. */