| 1 | //===---------- Linux implementation of the epoll_wait function -----------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "src/sys/epoll/epoll_wait.h" |
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| 10 | |
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| 11 | #include "hdr/signal_macros.h" // for NSIG |
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| 12 | #include "hdr/types/sigset_t.h" |
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| 13 | #include "hdr/types/struct_epoll_event.h" |
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| 14 | #include "src/__support/OSUtil/syscall.h" // For internal syscall function. |
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| 15 | #include "src/__support/common.h" |
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| 16 | #include "src/__support/libc_errno.h" |
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| 17 | #include "src/__support/macros/config.h" |
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| 18 | #include "src/__support/macros/sanitizer.h" |
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| 19 | |
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| 20 | #include <sys/syscall.h> // For syscall numbers. |
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| 21 | |
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| 22 | namespace LIBC_NAMESPACE_DECL { |
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| 23 | |
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| 24 | LLVM_LIBC_FUNCTION(int, epoll_wait, |
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| 25 | (int epfd, struct epoll_event *events, int maxevents, |
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| 26 | int timeout)) { |
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| 27 | #ifdef SYS_epoll_wait |
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| 28 | int ret = LIBC_NAMESPACE::syscall_impl<int>( |
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| 29 | SYS_epoll_wait, epfd, reinterpret_cast<long>(events), maxevents, timeout); |
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| 30 | #elif defined(SYS_epoll_pwait) |
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| 31 | int ret = LIBC_NAMESPACE::syscall_impl<int>( |
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| 32 | SYS_epoll_pwait, epfd, reinterpret_cast<long>(events), maxevents, timeout, |
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| 33 | reinterpret_cast<long>(nullptr), NSIG / 8); |
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| 34 | #else |
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| 35 | #error "epoll_wait and epoll_pwait are unavailable. Unable to build epoll_wait." |
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| 36 | #endif |
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| 37 | // A negative return value indicates an error with the magnitude of the |
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| 38 | // value being the error code. |
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| 39 | if (ret < 0) { |
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| 40 | libc_errno = -ret; |
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| 41 | return -1; |
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| 42 | } |
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| 43 | |
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| 44 | MSAN_UNPOISON(events, ret * sizeof(struct epoll_event)); |
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| 45 | |
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| 46 | return ret; |
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| 47 | } |
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| 48 | |
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| 49 | } // namespace LIBC_NAMESPACE_DECL |
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| 50 | |
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