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[libc] Implement pwait2 using pwait #99781

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Merged
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Jul 20, 2024
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[libc] Implement pwait2 using pwait #99781

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12 changes: 12 additions & 0 deletions libc/src/sys/epoll/linux/epoll_pwait2.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -25,10 +25,22 @@ namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(int, epoll_pwait2,
(int epfd, struct epoll_event *events, int maxevents,
const struct timespec *timeout, const sigset_t *sigmask)) {
#ifdef SYS_epoll_pwait2
int ret = LIBC_NAMESPACE::syscall_impl<int>(
SYS_epoll_pwait2, epfd, reinterpret_cast<long>(events), maxevents,
reinterpret_cast<long>(timeout), reinterpret_cast<long>(sigmask),
NSIG / 8);
#elif defined(SYS_epoll_pwait)
// Convert nanoseconds to milliseconds, rounding up if there are remaining
// nanoseconds
long timeout_ms = static_cast<long>(timeout->tv_sec * 1000 +
(timeout->tv_nsec + 999999) / 1000000);
int ret = LIBC_NAMESPACE::syscall_impl<int>(
SYS_epoll_pwait, epfd, reinterpret_cast<long>(events), maxevents,
timeout_ms, reinterpret_cast<long>(sigmask), NSIG / 8);
#else
#error "epoll_pwait and epoll_pwait2 syscalls not available."
#endif

// A negative return value indicates an error with the magnitude of the
// value being the error code.
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