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[libc] Support epoll_wait using epoll_pwait #80224

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Merged
merged 2 commits into from
Feb 1, 2024
Merged

[libc] Support epoll_wait using epoll_pwait #80224

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a6271b5
[libc] Support epoll_wait using epoll_pwait
michaelrj-google Feb 1, 2024
33966a4
add quotes to error
michaelrj-google Feb 1, 2024
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11 changes: 9 additions & 2 deletions libc/src/sys/epoll/linux/epoll_wait.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -10,11 +10,11 @@

#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
#include "src/__support/common.h"

#include "src/errno/libc_errno.h"
#include <sys/syscall.h> // For syscall numbers.

// TODO: Use this include once the include headers are also using quotes.
// #include "include/llvm-libc-types/sigset_t.h"
// #include "include/llvm-libc-types/struct_epoll_event.h"

#include <sys/epoll.h>
Expand All @@ -24,9 +24,16 @@ namespace LIBC_NAMESPACE {
LLVM_LIBC_FUNCTION(int, epoll_wait,
(int epfd, struct epoll_event *events, int maxevents,
int timeout)) {
#ifdef SYS_epoll_wait
int ret = LIBC_NAMESPACE::syscall_impl<int>(
SYS_epoll_wait, epfd, reinterpret_cast<long>(events), maxevents, timeout);

#elif defined(SYS_epoll_pwait)
int ret = LIBC_NAMESPACE::syscall_impl<int>(
SYS_epoll_pwait, epfd, reinterpret_cast<long>(events), maxevents, timeout,
reinterpret_cast<long>(nullptr), sizeof(sigset_t));
#else
#error "epoll_wait and epoll_pwait are unavailable. Unable to build epoll_wait."
#endif
// A negative return value indicates an error with the magnitude of the
// value being the error code.
if (ret < 0) {
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