107 lines
2.3 KiB
C++
107 lines
2.3 KiB
C++
// SPDX-License-Identifier: BSD-2-Clause
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// Copyright CM4all GmbH
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// author: Max Kellermann <mk@cm4all.com>
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#include "InotifyEvent.hxx"
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#include "lib/fmt/SystemError.hxx"
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#include "io/UniqueFileDescriptor.hxx"
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#include <array>
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#include <limits.h>
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#include <sys/inotify.h>
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static UniqueFileDescriptor
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CreateInotify()
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{
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int fd = inotify_init1(IN_CLOEXEC|IN_NONBLOCK);
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if (fd < 0)
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throw MakeErrno("inotify_init1() failed");
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return UniqueFileDescriptor(AdoptTag{}, fd);
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}
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InotifyEvent::InotifyEvent(EventLoop &event_loop, InotifyHandler &_handler)
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:event(event_loop, BIND_THIS_METHOD(OnInotifyReady),
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CreateInotify().Release()),
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handler(_handler)
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{
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Enable();
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}
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InotifyEvent::~InotifyEvent() noexcept
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{
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Close();
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}
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int
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InotifyEvent::TryAddWatch(const char *pathname, uint32_t mask) noexcept
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{
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return inotify_add_watch(event.GetFileDescriptor().Get(),
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pathname, mask);
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}
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int
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InotifyEvent::AddWatch(const char *pathname, uint32_t mask)
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{
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int wd = TryAddWatch(pathname, mask);
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if (wd < 0)
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throw FmtErrno("inotify_add_watch({:?}) failed", pathname);
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return wd;
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}
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int
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InotifyEvent::AddModifyWatch(const char *pathname)
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{
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return AddWatch(pathname, IN_MODIFY);
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}
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void
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InotifyEvent::RemoveWatch(int wd) noexcept
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{
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inotify_rm_watch(event.GetFileDescriptor().Get(), wd);
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}
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inline void
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InotifyEvent::OnInotifyReady(unsigned) noexcept
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try {
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std::array<std::byte, 4096> buffer;
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static_assert(sizeof(buffer) >= sizeof(struct inotify_event) + NAME_MAX + 1,
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"inotify buffer too small");
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ssize_t nbytes = event.GetFileDescriptor().Read(buffer);
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if (nbytes <= 0) [[unlikely]] {
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if (nbytes == 0)
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throw std::runtime_error{"EOF from inotify"};
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const int e = errno;
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if (e == EAGAIN)
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return;
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throw MakeErrno(e, "Reading inotify failed");
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}
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const std::byte *p = buffer.data(), *const end = p + nbytes;
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while (true) {
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const size_t remaining = end - p;
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const auto &ie = *(const struct inotify_event *)(const void *)p;
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if (remaining < sizeof(ie) ||
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remaining < sizeof(ie) + ie.len)
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break;
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const char *name;
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if (ie.len > 0 && ie.name[ie.len - 1] == 0)
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name = ie.name;
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else
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name = nullptr;
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handler.OnInotify(ie.wd, ie.mask, name);
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p += sizeof(ie) + ie.len;
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}
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} catch (...) {
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Close();
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handler.OnInotifyError(std::current_exception());
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}
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