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LibC: Rewrite pselect() as a wrapper for ppoll()

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This commit is contained in:
Jean-Baptiste Boric 2021-12-12 10:46:18 +01:00 • committed by Andreas Kling
parent 2177c2a30b
commit b840c8f68e
1 changed files with 51 additions and 3 deletions
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54
Userland/Libraries/LibC/sys/select.cpp
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@ -6,10 +6,13 @@
#include <errno.h>
#include <stdio.h>
#include <sys/poll.h>
#include <sys/select.h>
#include <sys/time.h>
#include <syscall.h>
#include <AK/Vector.h>
extern "C" {
int select(int nfds, fd_set* readfds, fd_set* writefds, fd_set* exceptfds, timeval* timeout_tv)
@ -25,8 +28,53 @@ int select(int nfds, fd_set* readfds, fd_set* writefds, fd_set* exceptfds, timev
int pselect(int nfds, fd_set* readfds, fd_set* writefds, fd_set* exceptfds, const timespec* timeout, const sigset_t* sigmask)
{
Syscall::SC_select_params params { nfds, readfds, writefds, exceptfds, timeout, sigmask };
int rc = syscall(SC_select, &params);
__RETURN_WITH_ERRNO(rc, rc, -1);
Vector<pollfd, FD_SETSIZE> fds;
if (nfds < 0 || static_cast<size_t>(nfds) >= fds.capacity())
return EINVAL;
for (int fd = 0; fd < nfds; fd++) {
short events = 0;
if (readfds && FD_ISSET(fd, readfds))
events |= POLLIN;
if (writefds && FD_ISSET(fd, writefds))
events |= POLLOUT;
if (exceptfds && FD_ISSET(fd, exceptfds))
events |= POLLPRI;
if (!events)
continue;
fds.unchecked_append({ fd, events, 0 });
}
if (ppoll(fds.data(), fds.size(), timeout, sigmask) < 0)
return -1;
if (readfds)
FD_ZERO(readfds);
if (writefds)
FD_ZERO(writefds);
if (exceptfds)
FD_ZERO(exceptfds);
int marked_fd_count = 0;
for (auto& fd_entry : fds) {
if (fd_entry.revents == 0)
continue;
if (readfds && (fd_entry.revents & POLLIN)) {
FD_SET(fd_entry.fd, readfds);
marked_fd_count++;
}
if (writefds && (fd_entry.revents & POLLOUT)) {
FD_SET(fd_entry.fd, writefds);
marked_fd_count++;
}
if (exceptfds && (fd_entry.revents & (POLLPRI | POLLERR | POLLHUP))) {
FD_SET(fd_entry.fd, exceptfds);
marked_fd_count++;
}
}
return marked_fd_count;
}
}