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pipefs: better nonblocking named fifo open() handling

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Matheus
2026-04-12 22:13:10 -03:00
parent 0a8e92a02f
commit b5ffaefa45
2 changed files with 9 additions and 3 deletions
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kernel-src/fs/pipefs.c
+8 -3
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@@ -40,6 +40,9 @@ int pipefs_close(vnode_t *node, int flags, cred_t *cred) {
if (pipenode->writers == 0)
poll_event(&pipenode->pollheader, POLLHUP);
if (pipenode->writers == 0 && pipenode->readers == 0)
pipenode->open = false;
INTERNAL_UNLOCK(node);
return 0;
}
@@ -61,8 +64,10 @@ int pipefs_open(vnode_t **node, int flags, cred_t *cred) {
int error = 0;
if (pipenode->writers > 0 && pipenode->readers > 0)
if (pipenode->writers > 0 && pipenode->readers > 0) {
pipenode->open = true;
goto leave;
}
if (flags & V_FFLAGS_NONBLOCKING) {
if (flags & V_FFLAGS_READ) {
@@ -110,7 +115,7 @@ static int internalpoll(vnode_t *node, polldata_t *data, int events) {
if (events & POLLIN) {
events |= POLLHUP;
if (pipenode->writers == 0)
if (pipenode->writers == 0 && pipenode->open)
revents |= POLLHUP;
else if (RINGBUFFER_DATACOUNT(&pipenode->data) > 0)
revents |= POLLIN;
@@ -118,7 +123,7 @@ static int internalpoll(vnode_t *node, polldata_t *data, int events) {
if (events & POLLOUT) {
events |= POLLERR;
if (pipenode->readers == 0)
if (pipenode->readers == 0 && pipenode->open)
revents |= POLLERR;
// poll will only return POLLOUT if an atomic write can be done without blocking
// this is undocumented in POSIX but many unices implement it like this