Robert HensingandRebecca Turner
ee0c195eba
This splits `ignoreException` into `ignoreExceptionExceptInterrupt` (which ignores all exceptions except `Interrupt`, which indicates a SIGINT/CTRL-C) and `ignoreExceptionInDestructor` (which ignores all exceptions, so that destructors do not throw exceptions). This prevents many cases where Nix ignores CTRL-C entirely. See: https://github.com/NixOS/nix/issues/7245 Upstream-PR: https://github.com/NixOS/nix/pull/11618 Change-Id: Ie7d2467eedbe840d1b9fa2e88a4e88e4ab26a87b
63 lines
1.3 KiB
C++
63 lines
1.3 KiB
C++
#pragma once
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///@file
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#include "error.hh"
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#include "file-descriptor.hh"
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namespace nix {
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/**
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* Open (possibly create) a lock file and return the file descriptor.
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* -1 is returned if create is false and the lock could not be opened
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* because it doesn't exist. Any other error throws an exception.
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*/
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AutoCloseFD openLockFile(const Path & path, bool create);
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/**
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* Delete an open lock file.
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*/
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void deleteLockFile(const Path & path, int fd);
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enum LockType { ltRead, ltWrite, ltNone };
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bool lockFile(int fd, LockType lockType, bool wait);
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class PathLocks
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{
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private:
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typedef std::pair<int, Path> FDPair;
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std::list<FDPair> fds;
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bool deletePaths;
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public:
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PathLocks();
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PathLocks(const PathSet & paths,
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const std::string & waitMsg = "");
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bool lockPaths(const PathSet & _paths,
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const std::string & waitMsg = "",
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bool wait = true);
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~PathLocks();
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void unlock();
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void setDeletion(bool deletePaths);
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};
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struct FdLock
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{
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int fd;
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bool acquired = false;
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FdLock(int fd, LockType lockType, bool wait, std::string_view waitMsg);
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~FdLock()
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{
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try {
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if (acquired)
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lockFile(fd, ltNone, false);
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} catch (SysError &) {
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ignoreExceptionInDestructor();
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}
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}
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};
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}
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