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posix.h File Reference
#include <pthread.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <unistd.h>
#include <cassert>
#include <cerrno>
#include <cstddef>
#include <map>
#include <set>
#include <string>
#include <vector>
#include "util/export.h"
#include "util/pointer.h"
#include "util/single_copy.h"
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Classes

struct  FileSystemInfo
 
struct  LsofEntry
 

Enumerations

enum  EFileSystemTypes {
  kFsTypeUnknown = 0, kFsTypeAutofs = 0x0187, kFsTypeNFS = 0x6969, kFsTypeProc = 0x9fa0,
  kFsTypeBeeGFS = 0x19830326, kFsTypeTmpfs = 0x01021994
}
 

Functions

CVMFS_EXPORT std::string MakeCanonicalPath (const std::string &path)
 
CVMFS_EXPORT std::string GetParentPath (const std::string &path)
 
CVMFS_EXPORT std::string GetFileName (const std::string &path)
 
CVMFS_EXPORT void SplitPath (const std::string &path, std::string *dirname, std::string *filename)
 
CVMFS_EXPORT bool IsAbsolutePath (const std::string &path)
 
CVMFS_EXPORT std::string GetAbsolutePath (const std::string &path)
 
CVMFS_EXPORT bool IsHttpUrl (const std::string &path)
 
CVMFS_EXPORT std::string ReadSymlink (const std::string &path)
 
CVMFS_EXPORT std::string ResolvePath (const std::string &path)
 
CVMFS_EXPORT bool IsMountPoint (const std::string &path)
 
CVMFS_EXPORT FileSystemInfo GetFileSystemInfo (const std::string &path)
 
CVMFS_EXPORT void CreateFile (const std::string &path, const int mode, const bool ignore_failure=false)
 
CVMFS_EXPORT int MakeSocket (const std::string &path, const int mode)
 
CVMFS_EXPORT int MakeTcpEndpoint (const std::string &ipv4_address, int portno)
 
CVMFS_EXPORT int ConnectSocket (const std::string &path)
 
CVMFS_EXPORT int ConnectTcpEndpoint (const std::string &ipv4_address, int portno)
 
CVMFS_EXPORT void MakePipe (int pipe_fd[2])
 
CVMFS_EXPORT void WritePipe (int fd, const void *buf, size_t nbyte)
 
CVMFS_EXPORT void ReadPipe (int fd, void *buf, size_t nbyte)
 
CVMFS_EXPORT void ReadHalfPipe (int fd, void *buf, size_t nbyte)
 
CVMFS_EXPORT void ClosePipe (int pipe_fd[2])
 
CVMFS_EXPORT bool DiffTree (const std::string &path_a, const std::string &path_b)
 
CVMFS_EXPORT void Nonblock2Block (int filedes)
 
CVMFS_EXPORT void Block2Nonblock (int filedes)
 
CVMFS_EXPORT void SendMsg2Socket (const int fd, const std::string &msg)
 
CVMFS_EXPORT bool SendFd2Socket (int socket_fd, int passing_fd)
 
CVMFS_EXPORT int RecvFdFromSocket (int msg_fd)
 
CVMFS_EXPORT std::string GetHostname ()
 
CVMFS_EXPORT bool SwitchCredentials (const uid_t uid, const gid_t gid, const bool temporarily)
 
CVMFS_EXPORT bool FileExists (const std::string &path)
 
CVMFS_EXPORT int64_t GetFileSize (const std::string &path)
 
CVMFS_EXPORT bool DirectoryExists (const std::string &path)
 
CVMFS_EXPORT bool SymlinkExists (const std::string &path)
 
CVMFS_EXPORT bool SymlinkForced (const std::string &src, const std::string &dest)
 
CVMFS_EXPORT bool MkdirDeep (const std::string &path, const mode_t mode, bool verify_writable=true)
 
CVMFS_EXPORT bool MakeCacheDirectories (const std::string &path, const mode_t mode)
 
CVMFS_EXPORT FILE * CreateTempFile (const std::string &path_prefix, const int mode, const char *open_flags, std::string *final_path)
 
CVMFS_EXPORT std::string CreateTempPath (const std::string &path_prefix, const int mode)
 
CVMFS_EXPORT std::string CreateTempDir (const std::string &path_prefix)
 
CVMFS_EXPORT std::string GetCurrentWorkingDirectory ()
 
CVMFS_EXPORT int TryLockFile (const std::string &path)
 
CVMFS_EXPORT int LockFile (const std::string &path)
 
CVMFS_EXPORT int WritePidFile (const std::string &path)
 
CVMFS_EXPORT void UnlockFile (const int filedes)
 
CVMFS_EXPORT bool RemoveTree (const std::string &path)
 
CVMFS_EXPORT std::vector
< std::string > 
FindFilesBySuffix (const std::string &dir, const std::string &suffix)
 
CVMFS_EXPORT std::vector
< std::string > 
FindFilesByPrefix (const std::string &dir, const std::string &prefix)
 
CVMFS_EXPORT std::vector
< std::string > 
FindDirectories (const std::string &parent_dir)
 
CVMFS_EXPORT std::string FindExecutable (const std::string &exe)
 
CVMFS_EXPORT bool ListDirectory (const std::string &directory, std::vector< std::string > *names, std::vector< mode_t > *modes)
 
CVMFS_EXPORT std::string GetUserName ()
 
CVMFS_EXPORT std::string GetShell ()
 
CVMFS_EXPORT bool GetUserNameOf (uid_t uid, std::string *username)
 
CVMFS_EXPORT bool GetUidOf (const std::string &username, uid_t *uid, gid_t *main_gid)
 
CVMFS_EXPORT bool GetGidOf (const std::string &groupname, gid_t *gid)
 
CVMFS_EXPORT mode_t GetUmask ()
 
CVMFS_EXPORT bool AddGroup2Persona (const gid_t gid)
 
CVMFS_EXPORT std::string GetHomeDirectory ()
 
CVMFS_EXPORT std::string GetArch ()
 
CVMFS_EXPORT int SetLimitNoFile (unsigned limit_nofile)
 
CVMFS_EXPORT void GetLimitNoFile (unsigned *soft_limit, unsigned *hard_limit)
 
CVMFS_EXPORT std::vector
< LsofEntry
Lsof (const std::string &path)
 
CVMFS_EXPORT bool ProcessExists (pid_t pid)
 
CVMFS_EXPORT void BlockSignal (int signum)
 
CVMFS_EXPORT void WaitForSignal (int signum)
 
CVMFS_EXPORT int WaitForChild (pid_t pid, const std::vector< int > &sig_ok=std::vector< int >())
 
CVMFS_EXPORT void Daemonize ()
 
CVMFS_EXPORT bool Shell (int *pipe_stdin, int *pipe_stdout, int *pipe_stderr)
 
CVMFS_EXPORT 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=true, pid_t *child_pid=NULL)
 
CVMFS_EXPORT 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=false, const bool double_fork=true, pid_t *child_pid=NULL)
 
CVMFS_EXPORT bool CloseAllFildes (const std::set< int > &preserve_fildes)
 
CVMFS_EXPORT void SafeSleepMs (const unsigned ms)
 
CVMFS_EXPORT ssize_t SafeRead (int fd, void *buf, size_t nbyte)
 
CVMFS_EXPORT bool SafeWrite (int fd, const void *buf, size_t nbyte)
 
CVMFS_EXPORT bool SafeWriteV (int fd, struct iovec *iov, unsigned iovcnt)
 
CVMFS_EXPORT bool SafeReadToString (int fd, std::string *final_result)
 
CVMFS_EXPORT bool SafeWriteToFile (const std::string &content, const std::string &path, int mode)
 

Variables

const unsigned kPageSize = 4096
 
const size_t kMaxPathLength = 256
 
const int kDefaultFileMode = S_IWUSR | S_IRUSR | S_IRGRP | S_IROTH
 
const int kDefaultDirMode
 
const int kPrivateFileMode = S_IWUSR | S_IRUSR
 
const int kPrivateDirMode = S_IXUSR | S_IWUSR | S_IRUSR
 

Enumeration Type Documentation

The magic numbers that identify a file system in statfs() Adjust GetFileSystemInfo() when new file systems are added

Enumerator
kFsTypeUnknown 
kFsTypeAutofs 
kFsTypeNFS 
kFsTypeProc 
kFsTypeBeeGFS 
kFsTypeTmpfs 

Definition at line 42 of file posix.h.

Function Documentation

CVMFS_EXPORT bool AddGroup2Persona ( const gid_t  gid)

Adds gid to the list of supplementary groups

Definition at line 1401 of file posix.cc.

Referenced by main().

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CVMFS_EXPORT void Block2Nonblock ( int  filedes)

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

Definition at line 647 of file posix.cc.

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

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CVMFS_EXPORT void BlockSignal ( int  signum)

Blocks a signal for the calling thread.

Definition at line 1573 of file posix.cc.

Referenced by FuseMain().

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CVMFS_EXPORT 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 1810 of file posix.cc.

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

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CVMFS_EXPORT int ConnectSocket ( const std::string &  path)

Connects to a named socket.

Returns
socket file descriptor on success, -1 else

Definition at line 427 of file posix.cc.

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

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

Connects to a (remote) TCP server

Definition at line 461 of file posix.cc.

Referenced by ExternalCacheManager::ConnectLocator().

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

By default PANIC(NULL) on failure

Definition at line 280 of file posix.cc.

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

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

Create a directory with a unique name.

Definition at line 1047 of file posix.cc.

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

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CVMFS_EXPORT void Daemonize ( )

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

Definition at line 1628 of file posix.cc.

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

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CVMFS_EXPORT 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 561 of file posix.cc.

Referenced by DiffTree().

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CVMFS_EXPORT 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 = true,
pid_t *  child_pid = NULL 
)

Definition at line 1659 of file posix.cc.

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

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CVMFS_EXPORT bool FileExists ( const std::string &  path)

Checks if the regular file path exists.

Definition at line 791 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(), 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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CVMFS_EXPORT 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 1179 of file posix.cc.

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

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CVMFS_EXPORT 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 1244 of file posix.cc.

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

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

Returns ls $dir/$prefixGLOB

Definition at line 1151 of file posix.cc.

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

Definition at line 160 of file posix.cc.

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

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CVMFS_EXPORT std::string GetArch ( )

Returns the output of uname -m

Definition at line 1446 of file posix.cc.

Referenced by FileSystem::SetupGlobalEnvironmentParams().

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CVMFS_EXPORT std::string GetCurrentWorkingDirectory ( )

Get the current working directory of the running process

Definition at line 1060 of file posix.cc.

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

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

Gets the file name part of a path.

Definition at line 145 of file posix.cc.

CVMFS_EXPORT FileSystemInfo GetFileSystemInfo ( const std::string &  path)

Definition at line 180 of file posix.cc.

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

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

Name -> GID from groups database

Definition at line 1367 of file posix.cc.

Referenced by main().

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CVMFS_EXPORT std::string GetHomeDirectory ( )

Definition at line 1424 of file posix.cc.

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

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CVMFS_EXPORT std::string GetHostname ( )

Definition at line 750 of file posix.cc.

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

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CVMFS_EXPORT void GetLimitNoFile ( unsigned *  soft_limit,
unsigned *  hard_limit 
)

Get the file descriptor limits

Definition at line 1480 of file posix.cc.

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

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

Gets the directory part of a path.

Definition at line 132 of file posix.cc.

CVMFS_EXPORT std::string GetShell ( )

Definition at line 1300 of file posix.cc.

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

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

Name -> UID from passwd database

Definition at line 1344 of file posix.cc.

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

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CVMFS_EXPORT 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 1390 of file posix.cc.

CVMFS_EXPORT std::string GetUserName ( )

Definition at line 1282 of file posix.cc.

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

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

UID -> Name from passwd database

Definition at line 1321 of file posix.cc.

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

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CVMFS_EXPORT bool IsAbsolutePath ( const std::string &  path)

Definition at line 155 of file posix.cc.

Referenced by GetAbsolutePath().

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CVMFS_EXPORT bool IsMountPoint ( const std::string &  path)

Definition at line 266 of file posix.cc.

Referenced by main().

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CVMFS_EXPORT 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 1208 of file posix.cc.

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

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CVMFS_EXPORT 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 971 of file posix.cc.

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

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CVMFS_EXPORT 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 1499 of file posix.cc.

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

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

Creates the "hash cache" directory structure in path.

Definition at line 882 of file posix.cc.

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

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

Creates and binds to a named socket.

Definition at line 331 of file posix.cc.

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

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CVMFS_EXPORT 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 389 of file posix.cc.

Referenced by CachePlugin::Listen().

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CVMFS_EXPORT 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 1843 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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CVMFS_EXPORT void Nonblock2Block ( int  filedes)

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

Definition at line 636 of file posix.cc.

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

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CVMFS_EXPORT bool ProcessExists ( pid_t  pid)

Definition at line 1561 of file posix.cc.

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

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

Definition at line 223 of file posix.cc.

Referenced by Lsof().

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CVMFS_EXPORT 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 708 of file posix.cc.

Referenced by GetExistingFuseFd().

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CVMFS_EXPORT bool RemoveTree ( const std::string &  path)

Does rm -rf on path.

Definition at line 1095 of file posix.cc.

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

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

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

Definition at line 68 of file cvmfs_suid_util.cc.

Referenced by IsMountPoint(), Mount(), and ResolvePath().

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

Deal with EINTR and partial reads.

Definition at line 2042 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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CVMFS_EXPORT bool SafeReadToString ( int  fd,
std::string *  final_result 
)

Pull file contents into a string

Definition at line 2065 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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CVMFS_EXPORT bool SafeWrite ( int  fd,
const void *  buf,
size_t  nbyte 
)

Deal with EINTR and partial writes.

Definition at line 1983 of file posix.cc.

Referenced by CreatePidNamespace(), 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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CVMFS_EXPORT bool SafeWriteToFile ( const std::string &  content,
const std::string &  path,
int  mode 
)
CVMFS_EXPORT bool SafeWriteV ( int  fd,
struct iovec *  iov,
unsigned  iovcnt 
)

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

Definition at line 2001 of file posix.cc.

Referenced by CacheTransport::SendData().

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CVMFS_EXPORT 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 668 of file posix.cc.

Referenced by cvmfs::SendFuseFd().

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CVMFS_EXPORT 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 659 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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CVMFS_EXPORT 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 1458 of file posix.cc.

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

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CVMFS_EXPORT 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 1715 of file posix.cc.

Referenced by BashOptionsManager::ParsePath().

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CVMFS_EXPORT 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 113 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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CVMFS_EXPORT bool SwitchCredentials ( const uid_t  uid,
const gid_t  gid,
const bool  temporarily 
)

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

Definition at line 761 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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CVMFS_EXPORT bool SymlinkExists ( const std::string &  path)

Checks if the symlink file path exists.

Definition at line 823 of file posix.cc.

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

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

Equivalent of ln -sf $src $dest

Definition at line 833 of file posix.cc.

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

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CVMFS_EXPORT 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 913 of file posix.cc.

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

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CVMFS_EXPORT void UnlockFile ( const int  filedes)
CVMFS_EXPORT int WaitForChild ( pid_t  pid,
const std::vector< int > &  sig_ok 
)

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

Parameters
pidProcess identifier.
sig_okList of signals that are still considered a successful termination.

Definition at line 1602 of file posix.cc.

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

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CVMFS_EXPORT 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 1588 of file posix.cc.

Referenced by loader::Reload().

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CVMFS_EXPORT 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 935 of file posix.cc.

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

Writes to a pipe should always succeed.

Definition at line 501 of file posix.cc.

Referenced by CachePlugin::AskToDetach(), publish::CallServerHook(), PosixQuotaManager::Cleanup(), PosixQuotaManager::DoInsert(), PosixQuotaManager::DoList(), PosixQuotaManager::GetCleanupRate(), PosixQuotaManager::GetLimits(), PosixQuotaManager::GetPid(), PosixQuotaManager::GetProtocolRevision(), PosixQuotaManager::GetSharedStatus(), shrinkwrap::handle_file(), FuseInvalidator::InvalidateDentry(), FuseInvalidator::InvalidateInodes(), swissknife::CommandPull::Main(), PosixQuotaManager::MainCacheManager(), PosixQuotaManager::MainCommandServer(), 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< kPipeWatchdog >::Write(), glue::DentryTracker::~DentryTracker(), FuseInvalidator::~FuseInvalidator(), FuseRemounter::~FuseRemounter(), PosixQuotaManager::~PosixQuotaManager(), s3fanout::S3FanoutManager::~S3FanoutManager(), and perf::TelemetryAggregator::~TelemetryAggregator().

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Variable Documentation

const int kDefaultDirMode
Initial value:
= S_IXUSR | S_IWUSR | S_IRUSR |
S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH

Definition at line 33 of file posix.h.

Referenced by publish::ExportKeychain().

const size_t kMaxPathLength = 256

Definition at line 31 of file posix.h.

const unsigned kPageSize = 4096

This file is part of the CernVM File System.

Definition at line 30 of file posix.h.

Referenced by upload::LocalUploader::DoUpload(), upload::S3Uploader::DoUpload(), AuthzExternalFetcher::Recv(), and RamCacheManager::StartTxn().

const int kPrivateDirMode = S_IXUSR | S_IWUSR | S_IRUSR