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Kernel: Implement a limited version of POSIX poll().

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This commit is contained in:
Andreas Kling 2019-01-23 08:03:31 +01:00
parent b33e367f33
commit af06d5edc1
Notes: sideshowbarker 2024-07-19 15:58:15 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/af06d5edc12
1 changed files with 43 additions and 3 deletions
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46
Kernel/Process.cpp
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@ -1982,7 +1982,10 @@ int Process::sys$select(const Syscall::SC_select_params* params)
memset(readfds, 0, sizeof(fd_set));
auto bitmap = Bitmap::wrap((byte*)readfds, FD_SETSIZE);
for (int fd : m_select_read_fds) {
if (m_fds[fd].descriptor->can_read(*this)) {
auto* descriptor = file_descriptor(fd);
if (!descriptor)
continue;
if (descriptor->can_read(*this)) {
bitmap.set(fd, true);
++markedfds;
}
@ -1993,7 +1996,10 @@ int Process::sys$select(const Syscall::SC_select_params* params)
memset(writefds, 0, sizeof(fd_set));
auto bitmap = Bitmap::wrap((byte*)writefds, FD_SETSIZE);
for (int fd : m_select_write_fds) {
if (m_fds[fd].descriptor->can_write(*this)) {
auto* descriptor = file_descriptor(fd);
if (!descriptor)
continue;
if (descriptor->can_write(*this)) {
bitmap.set(fd, true);
++markedfds;
}
@ -2007,7 +2013,41 @@ int Process::sys$poll(pollfd* fds, int nfds, int timeout)
{
if (!validate_read_typed(fds))
return -EFAULT;
return 0;
m_select_write_fds.clear_with_capacity();
m_select_read_fds.clear_with_capacity();
for (int i = 0; i < nfds; ++i) {
if (fds[i].events & POLLIN)
m_select_read_fds.append(fds[i].fd);
if (fds[i].events & POLLOUT)
m_select_write_fds.append(fds[i].fd);
}
if (!m_wakeup_requested && timeout < 0) {
block(BlockedSelect);
Scheduler::yield();
}
m_wakeup_requested = false;
int fds_with_revents = 0;
for (int i = 0; i < nfds; ++i) {
auto* descriptor = file_descriptor(fds[i].fd);
if (!descriptor) {
fds[i].revents = POLLNVAL;
continue;
}
fds[i].revents = 0;
if (fds[i].events & POLLIN && descriptor->can_read(*this))
fds[i].revents |= POLLIN;
if (fds[i].events & POLLOUT && descriptor->can_write(*this))
fds[i].revents |= POLLOUT;
if (fds[i].revents)
++fds_with_revents;
}
return fds_with_revents;
}
Inode* Process::cwd_inode()