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posix.cc File Reference
#include "cvmfs_config.h"
#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/wait.h>
#include <unistd.h>
#include <algorithm>
#include <cassert>
#include <cstdio>
#include <cstring>
#include <map>
#include <set>
#include <string>
#include <vector>
#include "fs_traversal.h"
#include "logging.h"
#include "platform.h"
#include "util/algorithm.h"
#include "util/exception.h"
#include "util/string.h"
#include "util_concurrency.h"
Include dependency graph for posix.cc:

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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)
 
PathString GetParentPath (const PathString &path)
 
std::string GetFileName (const std::string &path)
 
NameString GetFileName (const PathString &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)
 
void ReadHalfPipe (int fd, void *buf, size_t nbyte)
 
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)
 
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 ()
 
int SetLimitNoFile (unsigned limit_nofile)
 
void GetLimitNoFile (unsigned *soft_limit, unsigned *hard_limit)
 
std::vector< LsofEntryLsof (const std::string &path)
 
bool ProcessExists (pid_t pid)
 
void BlockSignal (int signum)
 
void WaitForSignal (int signum)
 
int WaitForChild (pid_t 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)
 
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 70 of file posix.cc.

#define ST_RDONLY   1

Definition at line 66 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 1426 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 680 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 1588 of file posix.cc.

Referenced by FuseMain().

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int ConnectSocket ( const std::string &  path)

Connects to a named socket.

Returns
socket file descriptor on success, -1 else

Definition at line 460 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 494 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 313 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 1072 of file posix.cc.

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

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void Daemonize ( )

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

Definition at line 1637 of file posix.cc.

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

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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 594 of file posix.cc.

Referenced by DiffTree().

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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 1668 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 816 of file posix.cc.

Referenced by publish::CallServerHook(), MountPoint::CheckBlacklists(), PosixCacheManager::Create(), 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(), swissknife::CommandTag::InitializeEnvironment(), InitializeGarbageCollection(), publish::SyncUnionAufs::IsOpaqueDirectory(), 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(), 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 1204 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 1269 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 1176 of file posix.cc.

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

Definition at line 196 of file posix.cc.

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

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std::string GetCurrentWorkingDirectory ( )

Get the current working directory of the running process

Definition at line 1085 of file posix.cc.

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

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NameString GetFileName ( const PathString path)

Definition at line 172 of file posix.cc.

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FileSystemInfo GetFileSystemInfo ( const std::string &  path)

Definition at line 216 of file posix.cc.

Referenced by PosixCacheManager::Create(), 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 1392 of file posix.cc.

Referenced by main().

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std::string GetHomeDirectory ( )

Definition at line 1449 of file posix.cc.

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

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void GetLimitNoFile ( unsigned *  soft_limit,
unsigned *  hard_limit 
)

Get the file descriptor limits

Definition at line 1495 of file posix.cc.

Referenced by MountPoint::CreateCatalogManager(), FuseMain(), and monitor::GetMaxOpenFiles().

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PathString GetParentPath ( const PathString path)

Gets the file name part of a path.

Definition at line 144 of file posix.cc.

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std::string GetShell ( )

Definition at line 1325 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 1369 of file posix.cc.

Referenced by 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 1415 of file posix.cc.

std::string GetUserName ( )

Definition at line 1307 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 1346 of file posix.cc.

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

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bool IsAbsolutePath ( const std::string &  path)

Definition at line 191 of file posix.cc.

Referenced by GetAbsolutePath().

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bool IsMountPoint ( const std::string &  path)

Definition at line 299 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 1233 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 996 of file posix.cc.

Referenced by 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 1514 of file posix.cc.

Referenced by 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 907 of file posix.cc.

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

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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 332 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 364 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 422 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 1779 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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void Nonblock2Block ( int  filedes)

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

Definition at line 669 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 1576 of file posix.cc.

Referenced by publish::CmdEnter::CleanupSession(), and publish::ServerLockFile::IsLocked().

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void ReadHalfPipe ( int  fd,
void *  buf,
size_t  nbyte 
)
std::string ReadSymlink ( const std::string &  path)

Definition at line 256 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 741 of file posix.cc.

Referenced by GetExistingFuseFd().

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

Definition at line 354 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 1120 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 272 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 1983 of file posix.cc.

Referenced by CheckNamespaceFeatures(), 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 2006 of file posix.cc.

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

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bool SafeWrite ( int  fd,
const void *  buf,
size_t  nbyte 
)
bool SafeWriteToFile ( const std::string &  content,
const std::string &  path,
int  mode 
)

Definition at line 2022 of file posix.cc.

Referenced by publish::ExportKeychain(), swissknife::CommandLease::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 1942 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 701 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 692 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 1473 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 1724 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 112 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 786 of file posix.cc.

Referenced by FuseMain(), Watchdog::GenerateStackTrace(), publish::CmdAbort::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 848 of file posix.cc.

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

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

Equivalent of ln -sf $src $dest

Definition at line 858 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 938 of file posix.cc.

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

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void UnlockFile ( const int  filedes)
int WaitForChild ( pid_t  pid)

Returns -1 of the child crashed or the exit code otherwise

Definition at line 1615 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 1603 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 960 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 534 of file posix.cc.

Referenced by CachePlugin::AskToDetach(), publish::CallServerHook(), PosixQuotaManager::Cleanup(), PosixQuotaManager::DoInsert(), PosixQuotaManager::DoList(), download::DownloadManager::Fetch(), download::DownloadManager::Fini(), PosixQuotaManager::GetCleanupRate(), PosixQuotaManager::GetLimits(), PosixQuotaManager::GetPid(), PosixQuotaManager::GetProtocolRevision(), PosixQuotaManager::GetSharedStatus(), shrinkwrap::handle_file(), FuseInvalidator::InvalidateInodes(), swissknife::CommandPull::Main(), PosixQuotaManager::MainCacheManager(), PosixQuotaManager::MainCommandServer(), download::DownloadManager::MainDownload(), loader::loader_talk::MainReload(), CachePlugin::NotifySupervisor(), upload::S3Uploader::OnReqComplete(), BashOptionsManager::ParsePath(), PosixQuotaManager::Pin(), swissknife::CommandPull::Pull(), s3fanout::S3FanoutManager::PushCompletedJob(), s3fanout::S3FanoutManager::PushNewJob(), PosixQuotaManager::RegisterBackChannel(), PosixQuotaManager::Remove(), file_watcher::FileWatcherKqueue::RunEventLoop(), file_watcher::FileWatcherInotify::RunEventLoop(), SendCommand(), publish::SendTalkCommand(), FuseRemounter::SetAlarm(), cvmfs::Fetcher::SignalWaitingThreads(), file_watcher::FileWatcher::Stop(), shrinkwrap::SyncInit(), CachePlugin::Terminate(), PosixQuotaManager::Touch(), PosixQuotaManager::Unpin(), PosixQuotaManager::UnregisterBackChannel(), quota::UnregisterListener(), Pipe::Write(), FuseInvalidator::~FuseInvalidator(), FuseRemounter::~FuseRemounter(), glue::NentryTracker::~NentryTracker(), PosixQuotaManager::~PosixQuotaManager(), and s3fanout::S3FanoutManager::~S3FanoutManager().

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Variable Documentation

pthread_mutex_t getumask_mutex = PTHREAD_MUTEX_INITIALIZER
static

Definition at line 90 of file posix.cc.

Referenced by GetUmask().