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LibC: Implement pselect

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pselect() is similar() to select(), but it takes its timeout
as timespec instead of as timeval, and it takes an additional
sigmask parameter.

Change the sys$select parameters to match pselect() and implement
select() in terms of pselect().
This commit is contained in:
Nico Weber 2020-06-21 13:54:41 -04:00 • committed by Andreas Kling
parent 29f509a2a0
commit d23e655c83
6 changed files with 46 additions and 19 deletions
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16
Libraries/LibC/sys/select.cpp
View file

@ -28,12 +28,24 @@
#include <errno.h>
#include <stdio.h>
#include <sys/select.h>
#include <sys/time.h>
extern "C" {
int select(int nfds, fd_set* readfds, fd_set* writefds, fd_set* exceptfds, struct timeval* timeout)
int select(int nfds, fd_set* readfds, fd_set* writefds, fd_set* exceptfds, timeval* timeout_tv)
{
Syscall::SC_select_params params { nfds, readfds, writefds, exceptfds, timeout };
timespec* timeout_ts = nullptr;
timespec timeout;
if (timeout_tv) {
timeout_ts = &timeout;
TIMEVAL_TO_TIMESPEC(timeout_tv, timeout_ts);
}
return pselect(nfds, readfds, writefds, exceptfds, timeout_ts, nullptr);
}
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);
}

2
Libraries/LibC/sys/select.h
View file

@ -27,6 +27,7 @@
#pragma once
#include <fd_set.h>
#include <signal.h>
#include <string.h>
#include <sys/cdefs.h>
#include <sys/types.h>
@ -34,5 +35,6 @@
__BEGIN_DECLS
int select(int nfds, fd_set* readfds, fd_set* writefds, fd_set* exceptfds, struct timeval* timeout);
int pselect(int nfds, fd_set* readfds, fd_set* writefds, fd_set* exceptfds, const struct timespec* timeout, const sigset_t* sigmask);
__END_DECLS