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LibC: Implement poll() using select

This commit is contained in:
Bananymous 2024-08-22 14:28:01 +03:00
parent e59772a58d
commit c453a8e2dc
2 changed files with 57 additions and 0 deletions
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1
userspace/libraries/LibC/CMakeLists.txt
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@ -12,6 +12,7 @@ set(LIBC_SOURCES
malloc.cpp
math.cpp
netdb.cpp
poll.cpp
printf_impl.cpp
pwd.cpp
scanf_impl.cpp

56
userspace/libraries/LibC/poll.cpp Normal file
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@ -0,0 +1,56 @@
#include <poll.h>
#include <sys/select.h>
int poll(struct pollfd fds[], nfds_t nfds, int timeout)
{
fd_set rfds, wfds, efds;
FD_ZERO(&rfds);
FD_ZERO(&wfds);
FD_ZERO(&efds);
for (nfds_t i = 0; i < nfds; i++)
fds[i].revents = 0;
constexpr short rmask = POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI | POLLHUP;
constexpr short wmask = POLLOUT | POLLWRNORM | POLLWRBAND;
constexpr short emask = POLLERR;
int max_fd = 0;
for (nfds_t i = 0; i < nfds; i++)
{
if (fds[i].fd < 0)
continue;
if (fds[i].events & rmask)
FD_SET(fds[i].fd, &rfds);
if (fds[i].events & wmask)
FD_SET(fds[i].fd, &wfds);
if (fds[i].events & emask)
FD_SET(fds[i].fd, &efds);
if (fds[i].fd > max_fd)
max_fd = fds[i].fd;
}
timeval tv;
tv.tv_sec = timeout / 1000;
tv.tv_usec = timeout % 1000 * 1000;
int nselect = select(max_fd + 1, &rfds, &wfds, &efds, &tv);
if (nselect == -1)
return -1;
for (nfds_t i = 0; i < nfds; i++)
{
if (fds[i].fd < 0)
continue;
if (FD_ISSET(fds[i].fd, &rfds))
fds[i].revents |= fds[i].events & rmask;
if (FD_ISSET(fds[i].fd, &wfds))
fds[i].revents |= fds[i].events & wmask;
if (FD_ISSET(fds[i].fd, &efds))
fds[i].revents |= fds[i].events & emask;
}
return nselect;
}