#include "posix.h"
#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <inttypes.h>
#include <netinet/in.h>
#include <pthread.h>
#include <pwd.h>
#include <signal.h>
#include <stdint.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/statfs.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/un.h>
#include <sys/utsname.h>
#include <sys/wait.h>
#include <unistd.h>
#include <algorithm>
#include <cassert>
#include <cstdio>
#include <cstring>
#include <map>
#include <set>
#include <string>
#include <vector>
#include "util/algorithm.h"
#include "util/concurrency.h"
#include "util/exception.h"
#include "util/fs_traversal.h"
#include "util/logging.h"
#include "util/pipe.h"
#include "util/platform.h"
#include "util/string.h"

Include dependency graph for posix.cc:

Classes
class	RemoveTreeHelper

struct	ForkFailures

Macros
#define	__STDC_FORMAT_MACROS

#define	ST_RDONLY 1

#define	CVMFS_HAS_STATFS_F_FLAGS

Functions
std::string	MakeCanonicalPath (const std::string &path)

void	SplitPath (const std::string &path, std::string dirname, std::string filename)

std::string	GetParentPath (const std::string &path)

std::string	GetFileName (const std::string &path)

bool	IsAbsolutePath (const std::string &path)

std::string	GetAbsolutePath (const std::string &path)

bool	IsHttpUrl (const std::string &path)

FileSystemInfo	GetFileSystemInfo (const std::string &path)

std::string	ReadSymlink (const std::string &path)

std::string	ResolvePath (const std::string &path)

bool	IsMountPoint (const std::string &path)

void	CreateFile (const std::string &path, const int mode, const bool ignore_failure)

static std::string	MakeShortSocketLink (const std::string &path)

static void	RemoveShortSocketLink (const std::string &short_path)

int	MakeSocket (const std::string &path, const int mode)

int	MakeTcpEndpoint (const std::string &ipv4_address, int portno)

int	ConnectSocket (const std::string &path)

int	ConnectTcpEndpoint (const std::string &ipv4_address, int portno)

void	MakePipe (int pipe_fd[2])

void	WritePipe (int fd, const void *buf, size_t nbyte)

void	ReadPipe (int fd, void *buf, size_t nbyte)

bool	ReadHalfPipe (int fd, void *buf, size_t nbyte, unsigned timeout_ms)

void	ClosePipe (int pipe_fd[2])

bool	DiffTree (const std::string &path_a, const std::string &path_b)

void	Nonblock2Block (int filedes)

void	Block2Nonblock (int filedes)

void	SendMsg2Socket (const int fd, const std::string &msg)

bool	SendFd2Socket (int socket_fd, int passing_fd)

int	RecvFdFromSocket (int msg_fd)

std::string	GetHostname ()

bool	SwitchCredentials (const uid_t uid, const gid_t gid, const bool temporarily)

bool	FileExists (const std::string &path)

int64_t	GetFileSize (const std::string &path)

bool	DirectoryExists (const std::string &path)

bool	SymlinkExists (const std::string &path)

bool	SymlinkForced (const std::string &src, const std::string &dest)

bool	MkdirDeep (const std::string &path, const mode_t mode, bool verify_writable)

bool	MakeCacheDirectories (const std::string &path, const mode_t mode)

int	TryLockFile (const std::string &path)

int	WritePidFile (const std::string &path)

int	LockFile (const std::string &path)

void	UnlockFile (const int filedes)

FILE *	CreateTempFile (const std::string &path_prefix, const int mode, const char open_flags, std::string final_path)

std::string	CreateTempPath (const std::string &path_prefix, const int mode)

std::string	CreateTempDir (const std::string &path_prefix)

std::string	GetCurrentWorkingDirectory ()

bool	RemoveTree (const std::string &path)

std::vector< std::string >	FindFilesBySuffix (const std::string &dir, const std::string &suffix)

std::vector< std::string >	FindFilesByPrefix (const std::string &dir, const std::string &prefix)

std::vector< std::string >	FindDirectories (const std::string &parent_dir)

bool	ListDirectory (const std::string &directory, std::vector< std::string > names, std::vector< mode_t > modes)

std::string	FindExecutable (const std::string &exe)

std::string	GetUserName ()

std::string	GetShell ()

bool	GetUserNameOf (uid_t uid, std::string *username)

bool	GetUidOf (const std::string &username, uid_t uid, gid_t main_gid)

bool	GetGidOf (const std::string &groupname, gid_t *gid)

mode_t	GetUmask ()

bool	AddGroup2Persona (const gid_t gid)

std::string	GetHomeDirectory ()

std::string	GetArch ()

int	SetLimitNoFile (unsigned limit_nofile)

void	GetLimitNoFile (unsigned soft_limit, unsigned hard_limit)

std::vector< LsofEntry >	Lsof (const std::string &path)

bool	ProcessExists (pid_t pid)

void	BlockSignal (int signum)

void	WaitForSignal (int signum)

int	WaitForChild (pid_t pid, const std::vector< int > &sig_ok)

bool	ExecAsDaemon (const std::vector< std::string > &command_line, pid_t *child_pid)

void	Daemonize ()

bool	ExecuteBinary (int fd_stdin, int fd_stdout, int fd_stderr, const std::string &binary_path, const std::vector< std::string > &argv, const bool double_fork, pid_t child_pid)

bool	Shell (int fd_stdin, int fd_stdout, int *fd_stderr)

static bool	CloseAllFildesUntilMaxFD (const std::set< int > &preserve_fildes, int max_fd)

static bool	CloseAllFildesInProcSelfFd (const std::set< int > &preserve_fildes)

bool	CloseAllFildes (const std::set< int > &preserve_fildes)

bool	ManagedExec (const std::vector< std::string > &command_line, const std::set< int > &preserve_fildes, const std::map< int, int > &map_fildes, const bool drop_credentials, const bool clear_env, const bool double_fork, pid_t *child_pid)

void	SafeSleepMs (const unsigned ms)

bool	SafeWrite (int fd, const void *buf, size_t nbyte)

bool	SafeWriteV (int fd, struct iovec *iov, unsigned iovcnt)

ssize_t	SafeRead (int fd, void *buf, size_t nbyte)

bool	SafeReadToString (int fd, std::string *final_result)

bool	SafeWriteToFile (const std::string &content, const std::string &path, int mode)

Variables
static pthread_mutex_t	getumask_mutex = PTHREAD_MUTEX_INITIALIZER

Macro Definition Documentation

#define __STDC_FORMAT_MACROS

This file is part of the CernVM File System.

Some common functions.

Definition at line 9 of file posix.cc.

#define CVMFS_HAS_STATFS_F_FLAGS

Definition at line 72 of file posix.cc.

#define ST_RDONLY 1

Definition at line 68 of file posix.cc.

Referenced by GetFileSystemInfo().

Function Documentation

bool AddGroup2Persona ( const gid_t gid )

Adds gid to the list of supplementary groups

Definition at line 1399 of file posix.cc.

Referenced by main().

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void Block2Nonblock ( int filedes )

Changes a blocking file descriptor to a non-blocking one.

Definition at line 659 of file posix.cc.

Referenced by Watchdog::GenerateStackTrace(), and PosixQuotaManager::MainCommandServer().

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void BlockSignal ( int signum )

Blocks a signal for the calling thread.

Definition at line 1571 of file posix.cc.

Referenced by FuseMain().

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bool CloseAllFildes ( const std::set< int > & preserve_fildes )

Closes all file descriptors except the ones in preserve_fildes. To be used after fork but before exec.

Definition at line 1864 of file posix.cc.

Referenced by PosixQuotaManager::EmptyTrash(), Watchdog::Fork(), and ManagedExec().

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static bool CloseAllFildesInProcSelfFd ( const std::set< int > & preserve_fildes )

static

Loop through /proc/self/fd and close the listed FDs. Not used on macOS.

Definition at line 1830 of file posix.cc.

Referenced by CloseAllFildes().

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static bool CloseAllFildesUntilMaxFD	(	const std::set< int > &	preserve_fildes,
		int	max_fd
	)

static

Loop through all possible FDs and close them.

Definition at line 1814 of file posix.cc.

Referenced by CloseAllFildes().

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void ClosePipe ( int pipe_fd[2] )

int ConnectSocket ( const std::string & path )

Connects to a named socket.

Returns: socket file descriptor on success, -1 else

Definition at line 422 of file posix.cc.

Referenced by CheckConcurrentMount(), ExternalCacheManager::ConnectLocator(), GetExistingFuseFd(), loader::loader_talk::MainReload(), SendCommand(), cvmfs::SendFuseFd(), and publish::SendTalkCommand().

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int ConnectTcpEndpoint	(	const std::string &	ipv4_address,
		int	portno
	)

Connects to a (remote) TCP server

Definition at line 456 of file posix.cc.

Referenced by ExternalCacheManager::ConnectLocator().

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void CreateFile	(	const std::string &	path,
		const int	mode,
		const bool	ignore_failure
	)

By default PANIC(NULL) on failure

Definition at line 278 of file posix.cc.

Referenced by publish::CmdEnter::CreateUnderlay(), FuseMain(), loader::Reload(), FileSystem::SetupNfsMaps(), and FileSystem::SetupPosixCacheMgr().

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std::string CreateTempDir ( const std::string & path_prefix )

Create a directory with a unique name.

Definition at line 1055 of file posix.cc.

Referenced by publish::ClearScratch(), GetExistingFuseFd(), publish::CmdEnter::Main(), and MakeShortSocketLink().

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FILE* CreateTempFile	(	const std::string &	path_prefix,
		const int	mode,
		const char *	open_flags,
		std::string *	final_path
	)

Wrapper around mkstemp.

Definition at line 1014 of file posix.cc.

Referenced by catalog::WritableCatalogManager::CopyCatalogToLocalCache(), catalog::SimpleCatalogManager::CopyCatalogToTempFile(), cvmfs::Uuid::Create(), CreateTempPath(), upload::LocalUploader::DoUpload(), HttpObjectFetcher< CatalogT, HistoryT, ReflogT >::Download(), publish::DownloadRootObjects(), manifest::Breadcrumb::Export(), LocalObjectFetcher< CatalogT, HistoryT, ReflogT >::Fetch(), swissknife::CommandCheck::FetchPath(), catalog::SimpleCatalogManager::LoadCatalogByHash(), swissknife::MainWorker(), swissknife::CommandPull::Pull(), FileBackedBuffer::SaveToFile(), swissknife::Store(), and swissknife::StoreBuffer().

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std::string CreateTempPath	(	const std::string &	path_prefix,
		const int	mode
	)

Create the file but don't open. Use only in non-public tmp directories.

Definition at line 1042 of file posix.cc.

Referenced by swissknife::CommandEditTag::AddNewTag(), publish::SyncMediator::Commit(), upload::AbstractUploader::CreateAndOpenTemporaryChunkFile(), ServerTool::CreateEmptyReflog(), catalog::WritableCatalogManager::CreateNestedCatalog(), swissknife::CommandMigrate::MigrationWorker_20x::CreateNewEmptyCatalog(), receiver::CatalogMergeTool< RwCatalogMgr, RoCatalogMgr >::CreateNewManifest(), publish::CreateRootObjects(), swissknife::CommandMigrate::GenerateNestedCatalogMarkerChunk(), swissknife::Assistant::GetCatalog(), swissknife::Assistant::GetHistory(), swissknife::CommandTag::InitializeEnvironment(), and swissknife::CommandRollbackTag::Main().

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void Daemonize ( )

Makes a daemon. The daemon() call is deprecated on OS X

Definition at line 1685 of file posix.cc.

Referenced by Watchdog::Fork(), FuseMain(), and PosixQuotaManager::MainCacheManager().

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bool DiffTree	(	const std::string &	path_a,
		const std::string &	path_b
	)

Compares two directory trees on the meta-data level. Returns true iff the trees have identical content.

Definition at line 569 of file posix.cc.

Referenced by DiffTree().

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bool DirectoryExists ( const std::string & path )

Checks if the directory (not symlink) path exists.

Definition at line 824 of file posix.cc.

Referenced by swissknife::CommandSync::CheckParams(), publish::CmdEnter::CreateUnderlay(), publish::SettingsTransaction::DetectUnionFsType(), swissknife::CommandApplyDirtab::FilterCandidatesFromGlobResult(), FuseMain(), publish::InitSpoolArea(), publish::SyncUnionOverlayfs::IsOpaqueDirectory(), swissknife::CommandGc::Main(), swissknife::CommandListReflog::Main(), swissknife::CommandListCatalogs::Main(), swissknife::CommandPull::Main(), swissknife::CommandCheck::Main(), swissknife::CommandFileStats::Main(), BashOptionsManager::ParsePath(), posix_archive_provenance(), posix_cleanup_path(), posix_initialize(), PosixCheckDirStructure(), SigningTool::Run(), and WaitForReload().

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bool ExecAsDaemon	(	const std::vector< std::string > &	command_line,
		pid_t *	child_pid
	)

Exec a command as a daemon.

Definition at line 1627 of file posix.cc.

Referenced by PosixQuotaManager::CreateShared().

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bool ExecuteBinary	(	int *	fd_stdin,
		int *	fd_stdout,
		int *	fd_stderr,
		const std::string &	binary_path,
		const std::vector< std::string > &	argv,
		const bool	double_fork,
		pid_t *	child_pid
	)

Definition at line 1716 of file posix.cc.

Referenced by Watchdog::GenerateStackTrace(), main(), and Shell().

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bool FileExists ( const std::string & path )

Checks if the regular file path exists.

Definition at line 803 of file posix.cc.

Referenced by publish::CallServerHook(), MountPoint::CheckBlacklists(), swissknife::CommandApplyDirtab::CreateCatalogMarkers(), publish::CheckoutMarker::CreateFrom(), publish::SettingsBuilder::CreateSettingsPublisher(), PosixQuotaManager::CreateShared(), swissknife::CommandInfo::Exists(), swissknife::CommandCheck::Exists(), LocalObjectFetcher< CatalogT, HistoryT, ReflogT >::Fetch(), LocalObjectFetcher< CatalogT, HistoryT, ReflogT >::FetchManifest(), swissknife::CommandApplyDirtab::FilterCandidatesFromGlobResult(), AuthzExternalFetcher::FindHelper(), GetCvmfsBinary(), publish::SettingsKeychain::HasDanglingMasterKeys(), publish::SettingsKeychain::HasDanglingRepositoryKeys(), publish::SettingsKeychain::HasGatewayKey(), publish::SettingsKeychain::HasMasterKeys(), publish::SettingsKeychain::HasRepositoryKeys(), PosixCacheManager::InitCacheDirectory(), swissknife::CommandTag::InitializeEnvironment(), InitializeGarbageCollection(), download::Interrupted(), publish::SyncUnionAufs::IsOpaqueDirectory(), publish::ServerFlagFile::IsSet(), catalog::SimpleCatalogManager::LoadCatalogByHash(), publish::CmdEnter::Main(), swissknife::CommandApplyDirtab::Main(), PosixQuotaManager::MainCacheManager(), PosixQuotaManager::MainCommandServer(), SpecTree::Open(), catalog::Dirtab::Open(), StatisticsDatabase::OpenStandardDB(), upload::S3Uploader::ParseSpoolerDefinition(), upload::LocalUploader::Peek(), swissknife::Peek(), posix_cleanup_path(), posix_do_link(), posix_has_file(), publish::Publisher(), MountPoint::ReloadBlacklists(), FileSystem::SetupNfsMaps(), SslCertificateStore::UseSystemCertificatePath(), and WaitForReload().

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std::vector<std::string> FindDirectories ( const std::string & parent_dir )

Finds all direct subdirectories under parent_dir (except ., ..). Used, for instance, to parse /etc/cvmfs/repositories.d/<reponoame>

Definition at line 1178 of file posix.cc.

Referenced by publish::SettingsBuilder::GetSingleAlias().

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std::string FindExecutable ( const std::string & exe )

Looks whether exe is an executable file. If exe is not an absolute path, searches the PATH environment.

Definition at line 1242 of file posix.cc.

Referenced by publish::CmdEnter::MountCvmfs(), and publish::CmdEnter::MountOverlayfs().

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std::vector<std::string> FindFilesByPrefix	(	const std::string &	dir,
		const std::string &	prefix
	)

Returns ls $dir/$prefixGLOB

Definition at line 1153 of file posix.cc.

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std::vector<std::string> FindFilesBySuffix	(	const std::string &	dir,
		const std::string &	suffix
	)

Returns ls $dir/GLOB$suffix

Definition at line 1129 of file posix.cc.

Referenced by MountPoint::CreateSignatureManager(), anonymous_namespace{cmd_sub.cc}::SwissknifeSubscriber::Init(), swissknife::CommandGc::Main(), swissknife::CommandListReflog::Main(), swissknife::CommandListCatalogs::Main(), swissknife::CommandPull::Main(), swissknife::CommandCheck::Main(), swissknife::CommandFileStats::Main(), OptionsManager::ParseDefault(), and publish::Repository().

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std::string GetAbsolutePath ( const std::string & path )

Definition at line 159 of file posix.cc.

Referenced by publish::SyncUnionTarball::Initialize(), and swissknife::CommandFileStats::Run().

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std::string GetArch ( )

Returns the output of uname -m

Definition at line 1444 of file posix.cc.

Referenced by FileSystem::SetupGlobalEnvironmentParams().

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std::string GetCurrentWorkingDirectory ( )

Get the current working directory of the running process

Definition at line 1068 of file posix.cc.

Referenced by CreateMountNamespace(), GetAbsolutePath(), publish::CmdAbort::Main(), publish::CmdEnter::Main(), and Spawn().

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std::string GetFileName ( const std::string & path )

Gets the file name part of a path.

Definition at line 144 of file posix.cc.

int64_t GetFileSize ( const std::string & path )

Returns -1 on failure.

Definition at line 812 of file posix.cc.

Referenced by swissknife::CommandEditTag::AddNewTag(), catalog::WritableCatalogManager::CatalogUploadCallback(), catalog::WritableCatalogManager::CreateRepository(), upload::LocalUploader::DoGetObjectSize(), swissknife::CommandCheck::FetchCatalog(), upload::LocalUploader::FinalizeStreamedUpload(), catalog::VirtualCatalog::InsertSnapshot(), swissknife::CommandMigrate::MigrationCallback(), swissknife::CatalogTraversalBase< ObjectFetcherT >::PrepareCatalog(), swissknife::CommandFileStats::ProcessCatalog(), catalog::WritableCatalogManager::SingleCatalogUploadCallback(), catalog::WritableCatalogManager::SnapshotCatalogsSerialized(), and swissknife::CommandTag::UploadCatalogAndUpdateManifest().

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FileSystemInfo GetFileSystemInfo ( const std::string & path )

Definition at line 179 of file posix.cc.

Referenced by PosixCacheManager::InitCacheDirectory(), publish::CmdCommit::Main(), and publish::CmdTransaction::Main().

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bool GetGidOf	(	const std::string &	groupname,
		gid_t *	gid
	)

Name -> GID from groups database

Definition at line 1365 of file posix.cc.

Referenced by acl_entry_from_text(), and main().

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std::string GetHomeDirectory ( )

Definition at line 1422 of file posix.cc.

Referenced by publish::CmdEnter::Main().

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std::string GetHostname ( )

Definition at line 762 of file posix.cc.

Referenced by MakeAcquireRequest(), and anonymous_namespace{repository_session.cc}::MakeAcquireRequest().

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void GetLimitNoFile	(	unsigned *	soft_limit,
		unsigned *	hard_limit
	)

Get the file descriptor limits

Definition at line 1478 of file posix.cc.

Referenced by CheckMaxOpenFiles(), MountPoint::CreateCatalogManager(), and FuseMain().

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std::string GetParentPath ( const std::string & path )

Gets the directory part of a path.

Definition at line 131 of file posix.cc.

std::string GetShell ( )

Definition at line 1298 of file posix.cc.

Referenced by publish::CmdEnter::Main().

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bool GetUidOf	(	const std::string &	username,
		uid_t *	uid,
		gid_t *	main_gid
	)

Name -> UID from passwd database

Definition at line 1342 of file posix.cc.

Referenced by acl_entry_from_text(), main(), publish::SettingsPublisher::SetOwner(), and MountPoint::SetupBehavior().

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mode_t GetUmask ( )

read the current umask of this process Note: umask query is guarded by a global mutex. Hence, always use this function and beware of scalability bottlenecks

Definition at line 1388 of file posix.cc.

std::string GetUserName ( )

Definition at line 1280 of file posix.cc.

Referenced by publish::CmdMkfs::Main().

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bool GetUserNameOf	(	uid_t	uid,
		std::string *	username
	)

UID -> Name from passwd database

Definition at line 1319 of file posix.cc.

Referenced by publish::CmdAbort::Main().

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bool IsAbsolutePath ( const std::string & path )

Definition at line 154 of file posix.cc.

Referenced by GetAbsolutePath().

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bool IsHttpUrl ( const std::string & path )

Definition at line 167 of file posix.cc.

Referenced by notify::DoPublish(), s3fanout::S3FanoutManager::InitializeDnsSettings(), swissknife::CommandListReflog::Main(), swissknife::CommandListCatalogs::Main(), swissknife::CommandCheck::Main(), swissknife::CommandFileStats::Main(), and swissknife::CommandMigrate::Main().

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bool IsMountPoint ( const std::string & path )

Definition at line 264 of file posix.cc.

Referenced by main().

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bool ListDirectory	(	const std::string &	directory,
		std::vector< std::string > *	names,
		std::vector< mode_t > *	modes
	)

Finds all files and direct subdirectories under directory (except ., ..).

Definition at line 1207 of file posix.cc.

Referenced by publish::ClearScratch(), publish::CmdEnter::CreateUnderlay(), and Lsof().

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int LockFile ( const std::string & path )

Locks file path, blocks if file is already locked. Creates path if required.

Returns: file descriptor, -1 on error

Definition at line 980 of file posix.cc.

Referenced by CheckConcurrentMount(), PosixQuotaManager::CreateShared(), PosixQuotaManager::InitDatabase(), FileSystem::LockWorkspace(), and PosixQuotaManager::MainCacheManager().

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std::vector<LsofEntry> Lsof ( const std::string & path )

Searches for open file descriptors on the subtree starting at path. For the time being works only on Linux, not on macOS.

Definition at line 1497 of file posix.cc.

Referenced by publish::CmdLsof::Main(), and publish::CmdAbort::Main().

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bool MakeCacheDirectories	(	const std::string &	path,
		const mode_t	mode
	)

Creates the "hash cache" directory structure in path.

Definition at line 890 of file posix.cc.

Referenced by upload::LocalUploader::Create(), FuseMain(), PosixCacheManager::InitCacheDirectory(), main(), and catalog::SimpleCatalogManager::SimpleCatalogManager().

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std::string MakeCanonicalPath ( const std::string & path )

Removes a trailing "/" from a path.

Definition at line 98 of file posix.cc.

Referenced by FileSystem::DeterminePosixCacheSettings(), notify::DoPublish(), manifest::Breadcrumb::Export(), FuseMain(), GetCacheDir(), publish::GetFqrnFromUrl(), anonymous_namespace{cvmfs_cache_posix.cc}::GetSettings(), GetWorkspace(), swissknife::CommandTag::InitializeEnvironment(), swissknife::CommandInfo::Main(), swissknife::CommandScrub::Main(), swissknife::Ingest::Main(), swissknife::IngestSQL::Main(), swissknife::CommandCheck::Main(), publish::CmdTransaction::Main(), swissknife::CommandApplyDirtab::Main(), main(), swissknife::CommandSync::Main(), MakeCacheDirectories(), publish::SyncUnionTarball::ProcessArchiveEntry(), and FileSystem::SetupWorkspace().

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void MakePipe ( int pipe_fd[2] )

Creating a pipe should always succeed.

Definition at line 487 of file posix.cc.

Referenced by CachePlugin::CachePlugin(), publish::CallServerHook(), PosixQuotaManager::Create(), upload::S3Uploader::Create(), CreatePidNamespace(), PosixQuotaManager::CreateShared(), upload::S3Uploader::DoUpload(), AuthzExternalFetcher::ExecHelper(), ExecuteBinary(), cvmfs::Fetcher::GetTls(), swissknife::CommandPull::Main(), PosixQuotaManager::MakeReturnPipe(), BashOptionsManager::ParsePath(), upload::S3Uploader::Peek(), Pipe< kPipeWatchdog >::Pipe(), PosixQuotaManager::RegisterBackChannel(), ExternalQuotaManager::RegisterBackChannel(), quota::RegisterUnpinListener(), quota::RegisterWatchdogListener(), s3fanout::S3FanoutManager::S3FanoutManager(), FuseRemounter::Spawn(), perf::TelemetryAggregator::Spawn(), file_watcher::FileWatcher::Spawn(), glue::DentryTracker::SpawnCleaner(), ExternalCacheManager::SpawnPlugin(), and shrinkwrap::SyncInit().

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static std::string MakeShortSocketLink ( const std::string & path )

static

Symlinks /tmp/cvmfs.XYZ/l –> ParentPath(path) to make it shorter

Definition at line 295 of file posix.cc.

Referenced by ConnectSocket(), and MakeSocket().

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int MakeSocket	(	const std::string &	path,
		const int	mode
	)

Creates and binds to a named socket.

Definition at line 327 of file posix.cc.

Referenced by TalkManager::Create(), GetExistingFuseFd(), loader::loader_talk::Init(), and CachePlugin::Listen().

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int MakeTcpEndpoint	(	const std::string &	ipv4_address,
		int	portno
	)

Creates and binds a TCP/IPv4 socket. An empty address binds to the "any" address.

Definition at line 384 of file posix.cc.

Referenced by CachePlugin::Listen().

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bool ManagedExec	(	const std::vector< std::string > &	command_line,
		const std::set< int > &	preserve_fildes,
		const std::map< int, int > &	map_fildes,
		const bool	drop_credentials,
		const bool	clear_env,
		const bool	double_fork,
		pid_t *	child_pid
	)

Execve to the given command line, preserving the given file descriptors. If stdin, stdout, stderr should be preserved, add 0, 1, 2. File descriptors from the parent process can also be mapped to the new process (dup2) using map_fildes. Can be useful for stdout/in/err redirection. NOTE: The destination fildes have to be preserved! Does a double fork to detach child. The command_line parameter contains the binary at index 0 and the arguments in the rest of the vector. Using the optional parameter *pid it is possible to retrieve the process ID of the spawned process.

Definition at line 1896 of file posix.cc.

Referenced by publish::CallServerHook(), PosixQuotaManager::CreateShared(), ExecuteBinary(), publish::CmdEnter::Main(), publish::CmdEnter::MountCvmfs(), publish::CmdEnter::MountOverlayfs(), publish::RunSuidHelper(), and ExternalCacheManager::SpawnPlugin().

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bool MkdirDeep	(	const std::string &	path,
		const mode_t	mode,
		bool	verify_writable
	)

The mkdir -p command. Additionally checks if the directory is writable if it exists.

Definition at line 855 of file posix.cc.

Referenced by upload::LocalUploader::Create(), publish::CreateDirectoryAsOwner(), swissknife::CommandGraft::DirCallback(), publish::SettingsSpoolArea::EnsureDirectories(), anonymous_namespace{cmd_enter.cc}::EnsureDirectory(), FuseMain(), StatisticsDatabase::GetDBParams(), receiver::PayloadProcessor::Initialize(), publish::CmdEnter::Main(), main(), MakeCacheDirectories(), upload::LocalUploader::Mkdir(), MkdirDeep(), posix_archive_provenance(), posix_initialize(), PosixCheckDirStructure(), receiver::CommitProcessor::Process(), swissknife::CommandFileStats::Run(), FileSystem::SetupNfsMaps(), and FileSystem::SetupWorkspace().

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void Nonblock2Block ( int filedes )

Changes a non-blocking file descriptor to a blocking one.

Definition at line 648 of file posix.cc.

Referenced by PosixQuotaManager::BindReturnPipe(), PosixQuotaManager::CreateShared(), PosixQuotaManager::MainCacheManager(), and PosixQuotaManager::MakeReturnPipe().

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bool ProcessExists ( pid_t pid )

Definition at line 1559 of file posix.cc.

Referenced by publish::CmdEnter::CleanupSession().

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bool ReadHalfPipe	(	int	fd,
		void *	buf,
		size_t	nbyte,
		unsigned	timeout_ms
	)

Reads from a pipe where writer's end is not yet necessarily connected

Definition at line 520 of file posix.cc.

Referenced by PosixQuotaManager::GetPid(), PosixQuotaManager::ManagedReadHalfPipe(), PosixQuotaManager::SetSharedLimit(), and file_watcher::FileWatcher::Spawn().

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void ReadPipe	(	int	fd,
		void *	buf,
		size_t	nbyte
	)

Reads from a pipe should always succeed.

Definition at line 508 of file posix.cc.

Referenced by PosixQuotaManager::DoList(), cvmfs::Fetcher::Fetch(), PosixQuotaManager::GetLimits(), PosixQuotaManager::GetSharedStatus(), PosixQuotaManager::MainCacheManager(), glue::DentryTracker::MainCleaner(), PosixQuotaManager::MainCommandServer(), CachePlugin::MainProcessRequests(), FuseRemounter::MainRemountTrigger(), perf::TelemetryAggregator::MainTelemetry(), quota::MainUnpinListener(), s3fanout::S3FanoutManager::MainUpload(), quota::MainWatchdogListener(), swissknife::MainWorker(), shrinkwrap::MainWorker(), BashOptionsManager::ParsePath(), s3fanout::S3FanoutManager::PopCompletedJob(), Pipe< kPipeWatchdog >::Read(), file_watcher::FileWatcherInotify::RunEventLoop(), and upload::S3Uploader::RequestCtrl::WaitFor().

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std::string ReadSymlink ( const std::string & path )

Definition at line 221 of file posix.cc.

Referenced by Lsof().

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int RecvFdFromSocket ( int msg_fd )

Returns the file descriptor that has been sent with SendFd2Socket. The msg_fd file descriptor needs to come from a call to accept() on the socket where the passing file descriptor has been sent to. Returns -errno on error.

Definition at line 720 of file posix.cc.

Referenced by GetExistingFuseFd().

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static void RemoveShortSocketLink ( const std::string & short_path )

static

Definition at line 317 of file posix.cc.

Referenced by ConnectSocket(), and MakeSocket().

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bool RemoveTree ( const std::string & path )

Does rm -rf on path.

Definition at line 1101 of file posix.cc.

Referenced by publish::CmdEnter::CleanupSession(), NfsMapsLeveldb::Create(), and RaiiTempDir::~RaiiTempDir().

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std::string ResolvePath ( const std::string & path )

Follow all symlinks if possible. Equivalent to readlink --canonicalize-missing

Definition at line 237 of file posix.cc.

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ssize_t SafeRead	(	int	fd,
		void *	buf,
		size_t	nbyte
	)

Deal with EINTR and partial reads.

Definition at line 2094 of file posix.cc.

Referenced by CheckNamespaceFeatures(), PosixQuotaManager::CreateShared(), anonymous_namespace{cmd_enter.cc}::EnterRootContainer(), FileIngestionSource::Read(), receiver::Reactor::ReadReply(), receiver::Reactor::ReadRequest(), AuthzExternalFetcher::Recv(), CacheTransport::RecvFrame(), CacheTransport::RecvHeader(), and SafeReadToString().

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bool SafeReadToString	(	int	fd,
		std::string *	final_result
	)

Pull file contents into a string

Definition at line 2117 of file posix.cc.

Referenced by publish::SyncMediator::Add(), notify::DoPublish(), publish::ExitShell(), signature::SignatureManager::LoadBlacklist(), swissknife::Ingest::Main(), publish::CmdEnter::Main(), swissknife::CommandSync::Main(), gateway::ReadKeys(), and download::ResolveProxyDescription().

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void SafeSleepMs ( const unsigned ms )

Sleeps using select. This is without signals and doesn't interfere with other uses of the ALRM signal.

Definition at line 2025 of file posix.cc.

Referenced by s3fanout::S3FanoutManager::Backoff(), download::DownloadManager::Backoff(), NfsMapsSqlite::BusyHandler(), ExternalCacheManager::CreatePlugin(), Fence::Drain(), anonymous_namespace{cache_posix.cc}::CallGuard::Drainout(), Fence::Enter(), Watchdog::GenerateStackTrace(), FuseInvalidator::MainInvalidator(), swissknife::CommandPull::Pull(), ReadHalfPipe(), Watchdog::SendTrace(), NfsMapsLeveldb::ForkAwareEnv::SleepForMicroseconds(), shrinkwrap::SyncInit(), PosixCacheManager::TearDown2ReadOnly(), BackoffThrottle::Throttle(), auto_umount::UmountOnCrash(), FuseInvalidator::Handle::WaitFor(), NfsMapsLeveldb::ForkAwareEnv::WaitForBGThreads(), and WaitForReload().

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bool SafeWrite	(	int	fd,
		const void *	buf,
		size_t	nbyte
	)

Deal with EINTR and partial writes.

Definition at line 2036 of file posix.cc.

Referenced by CreatePidNamespace(), PosixQuotaManager::CreateShared(), FuseMain(), LogCustom(), swissknife::CommandGraft::Publish(), SafeWriteToFile(), AuthzExternalFetcher::Send(), publish::SetInConfig(), manifest::Reflog::WriteChecksum(), WritePidFile(), receiver::Reactor::WriteReply(), and receiver::Reactor::WriteRequest().

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bool SafeWriteToFile	(	const std::string &	content,
		const std::string &	path,
		int	mode
	)

Definition at line 2137 of file posix.cc.

Referenced by publish::ExportKeychain(), swissknife::CommandLease::Main(), publish::CmdAbort::Main(), publish::CmdCommit::Main(), publish::CmdEnter::Main(), download::ResolveProxyDescription(), SigningTool::Run(), publish::CheckoutMarker::SaveAs(), and publish::CmdEnter::WriteCvmfsConfig().

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bool SafeWriteV	(	int	fd,
		struct iovec *	iov,
		unsigned	iovcnt
	)

The contents of the iov vector might be modified by the function.

Definition at line 2054 of file posix.cc.

Referenced by CacheTransport::SendData().

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bool SendFd2Socket	(	int	socket_fd,
		int	passing_fd
	)

Sends the file descriptor passing_fd to the socket socket_fd. Can be used to transfer an open file descriptor from one process to another. Use ConnectSocket() to get the socket_fd.

Definition at line 680 of file posix.cc.

Referenced by cvmfs::SendFuseFd().

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void SendMsg2Socket	(	const int	fd,
		const std::string &	msg
	)

Drops the characters of string to a socket. It doesn't matter if the other side has hung up.

Definition at line 671 of file posix.cc.

Referenced by CheckConcurrentMount(), FreeSavedState(), CacheManager::FreeState(), GetExistingFuseFd(), loader::loader_talk::MainTalk(), MaintenanceMode(), loader::Reload(), CacheManager::RestoreState(), RestoreState(), CacheManager::SaveState(), and SaveState().

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int SetLimitNoFile ( unsigned limit_nofile )

Sets soft and hard limit for maximum number of open file descriptors. Returns 0 on success, -1 on failure, -2 if running under valgrind.

Definition at line 1456 of file posix.cc.

Referenced by FuseMain(), and LibGlobals::Initialize().

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bool Shell	(	int *	fd_stdin,
		int *	fd_stdout,
		int *	fd_stderr
	)

Opens /bin/sh and provides file descriptors to write into stdin and read from stdout. Quit shell simply by closing stderr, stdout, and stdin.

Definition at line 1769 of file posix.cc.

Referenced by BashOptionsManager::ParsePath().

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void SplitPath	(	const std::string &	path,
		std::string *	dirname,
		std::string *	filename
	)

Return both the file and directory name for a given path.

NOTE: If only a filename is given, the directory is returned as "."

Definition at line 114 of file posix.cc.

Referenced by catalog::WritableCatalogManager::Clone(), publish::SyncUnionTarball::CreateDirectories(), publish::SyncUnionTarball::ProcessArchiveEntry(), swissknife::CommandGraft::Publish(), and publish::SyncUnionTarball::Traverse().

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bool SwitchCredentials	(	const uid_t	uid,
		const gid_t	gid,
		const bool	temporarily
	)

set(e){g/u}id wrapper.

Definition at line 773 of file posix.cc.

Referenced by FuseMain(), Watchdog::GenerateStackTrace(), publish::CmdAbort::Main(), publish::CmdCommit::Main(), publish::CmdTransaction::Main(), ManagedExec(), SwitchCredentials(), and auto_umount::UmountOnCrash().

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bool SymlinkExists ( const std::string & path )

Checks if the symlink file path exists.

Definition at line 833 of file posix.cc.

Referenced by CheckNamespaceFeatures(), swissknife::CommandCheck::Exists(), GetCvmfsBinary(), posix_cleanup_path(), ResolvePath(), and SslCertificateStore::UseSystemCertificatePath().

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bool SymlinkForced	(	const std::string &	src,
		const std::string &	dest
	)

Equivalent of ln -sf $src $dest

Definition at line 842 of file posix.cc.

Referenced by publish::CmdEnter::CreateUnderlay(), publish::CmdEnter::Main(), and upload::LocalUploader::PlaceBootstrappingShortcut().

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int TryLockFile ( const std::string & path )

Tries to locks file path, return an error if file is already locked. Creates path if required.

Returns: file descriptor, -1 on error, -2 if it would block

Definition at line 922 of file posix.cc.

Referenced by CachePlugin::Listen(), FileSystem::LockWorkspace(), and publish::ServerLockFile::TryLock().

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void UnlockFile ( const int filedes )

Definition at line 1004 of file posix.cc.

Referenced by PosixQuotaManager::CloseDatabase(), PosixQuotaManager::CreateShared(), PosixQuotaManager::InitDatabase(), swissknife::CommandPull::Main(), PosixQuotaManager::MainCacheManager(), WritePidFile(), CachePlugin::~CachePlugin(), and FileSystem::~FileSystem().

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int WaitForChild	(	pid_t	pid,
		const std::vector< int > &	sig_ok
	)

Returns -1 if the child crashed or the exit code otherwise.

Parameters

pid	Process identifier.
sig_ok	List of signals that are still considered a successful termination.

Definition at line 1601 of file posix.cc.

Referenced by publish::CallServerHook(), publish::CmdEnter::Main(), publish::CmdEnter::MountCvmfs(), publish::CmdEnter::MountOverlayfs(), and publish::RunSuidHelper().

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void WaitForSignal ( int signum )

Waits for a signal. The signal should be blocked before for all threads. Threads inherit their parent's signal mask.

Definition at line 1586 of file posix.cc.

Referenced by loader::Reload().

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int WritePidFile ( const std::string & path )

Tries to write the process id in a /var/run/progname.pid like file. Returns the same as TryLockFile.

Returns: file descriptor, -1 on error, -2 if it would block

Definition at line 944 of file posix.cc.

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void WritePipe	(	int	fd,
		const void *	buf,
		size_t	nbyte
	)

Writes to a pipe should always succeed.

Definition at line 496 of file posix.cc.

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Variable Documentation

pthread_mutex_t getumask_mutex = PTHREAD_MUTEX_INITIALIZER

static

Definition at line 92 of file posix.cc.

Referenced by GetUmask().

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