// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
-// $Id: fileutl.cc,v 1.4 1998/07/12 23:58:48 jgg Exp $
+// $Id: fileutl.cc,v 1.30 1999/07/26 17:46:08 jgg Exp $
/* ######################################################################
File Utilities
#include <sys/stat.h>
#include <sys/fcntl.h>
#include <sys/types.h>
+#include <sys/time.h>
+#include <signal.h>
+#include <wait.h>
+#include <errno.h>
/*}}}*/
// CopyFile - Buffered copy of a file /*{{{*/
// ---------------------------------------------------------------------
/* The caller is expected to set things so that failure causes erasure */
-bool CopyFile(File From,File To)
+bool CopyFile(FileFd &From,FileFd &To)
{
if (From.IsOpen() == false || To.IsOpen() == false)
return false;
// Buffered copy between fds
unsigned char *Buf = new unsigned char[64000];
- long Size;
- while ((Size = read(From.Fd(),Buf,64000)) > 0)
+ unsigned long Size = From.Size();
+ while (Size != 0)
{
- if (To.Write(Buf,Size) == false)
+ unsigned long ToRead = Size;
+ if (Size > 64000)
+ ToRead = 64000;
+
+ if (From.Read(Buf,ToRead) == false ||
+ To.Write(Buf,ToRead) == false)
{
delete [] Buf;
return false;
}
+
+ Size -= ToRead;
}
delete [] Buf;
// Aquire a write lock
struct flock fl;
- fl.l_type= F_WRLCK;
- fl.l_whence= SEEK_SET;
- fl.l_start= 0;
- fl.l_len= 1;
+ fl.l_type = F_WRLCK;
+ fl.l_whence = SEEK_SET;
+ fl.l_start = 0;
+ fl.l_len = 0;
if (fcntl(FD,F_SETLK,&fl) == -1)
{
+ if (errno == ENOLCK)
+ {
+ _error->Warning("Not using locking for nfs mounted lock file %s",File.c_str());
+ return true;
+ }
if (Errors == true)
_error->Errno("open","Could not get lock %s",File.c_str());
close(FD);
// Stash the current dir.
char S[300];
S[0] = 0;
- if (getcwd(S,sizeof(S)) == 0)
+ if (getcwd(S,sizeof(S)-2) == 0)
return "/";
+ unsigned int Len = strlen(S);
+ S[Len] = '/';
+ S[Len+1] = 0;
return S;
}
/*}}}*/
+// flNotDir - Strip the directory from the filename /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+string flNotDir(string File)
+{
+ string::size_type Res = File.rfind('/');
+ if (Res == string::npos)
+ return File;
+ Res++;
+ return string(File,Res,Res - File.length());
+}
+ /*}}}*/
+// flNotFile - Strip the file from the directory name /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+string flNotFile(string File)
+{
+ string::size_type Res = File.rfind('/');
+ if (Res == string::npos)
+ return File;
+ Res++;
+ return string(File,0,Res);
+}
+ /*}}}*/
+// SetCloseExec - Set the close on exec flag /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+void SetCloseExec(int Fd,bool Close)
+{
+ if (fcntl(Fd,F_SETFD,(Close == false)?0:FD_CLOEXEC) != 0)
+ {
+ cerr << "FATAL -> Could not set close on exec " << strerror(errno) << endl;
+ exit(100);
+ }
+}
+ /*}}}*/
+// SetNonBlock - Set the nonblocking flag /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+void SetNonBlock(int Fd,bool Block)
+{
+ int Flags = fcntl(Fd,F_GETFL) & (~O_NONBLOCK);
+ if (fcntl(Fd,F_SETFL,Flags | ((Block == false)?0:O_NONBLOCK)) != 0)
+ {
+ cerr << "FATAL -> Could not set non-blocking flag " << strerror(errno) << endl;
+ exit(100);
+ }
+}
+ /*}}}*/
+// WaitFd - Wait for a FD to become readable /*{{{*/
+// ---------------------------------------------------------------------
+/* This waits for a FD to become readable using select. It is usefull for
+ applications making use of non-blocking sockets. The timeout is
+ in seconds. */
+bool WaitFd(int Fd,bool write,unsigned long timeout)
+{
+ fd_set Set;
+ struct timeval tv;
+ FD_ZERO(&Set);
+ FD_SET(Fd,&Set);
+ tv.tv_sec = timeout;
+ tv.tv_usec = 0;
+ if (write == true)
+ {
+ int Res;
+ do
+ {
+ Res = select(Fd+1,0,&Set,0,(timeout != 0?&tv:0));
+ }
+ while (Res < 0 && errno == EINTR);
+
+ if (Res <= 0)
+ return false;
+ }
+ else
+ {
+ int Res;
+ do
+ {
+ Res = select(Fd+1,&Set,0,0,(timeout != 0?&tv:0));
+ }
+ while (Res < 0 && errno == EINTR);
+
+ if (Res <= 0)
+ return false;
+ }
+
+ return true;
+}
+ /*}}}*/
+// ExecFork - Magical fork that sanitizes the context before execing /*{{{*/
+// ---------------------------------------------------------------------
+/* This is used if you want to cleanse the environment for the forked
+ child, it fixes up the important signals and nukes all of the fds,
+ otherwise acts like normal fork. */
+int ExecFork()
+{
+ // Fork off the process
+ pid_t Process = fork();
+ if (Process < 0)
+ {
+ cerr << "FATAL -> Failed to fork." << endl;
+ exit(100);
+ }
+
+ // Spawn the subprocess
+ if (Process == 0)
+ {
+ // Setup the signals
+ signal(SIGPIPE,SIG_DFL);
+ signal(SIGQUIT,SIG_DFL);
+ signal(SIGINT,SIG_DFL);
+ signal(SIGWINCH,SIG_DFL);
+ signal(SIGCONT,SIG_DFL);
+ signal(SIGTSTP,SIG_DFL);
+
+ // Close all of our FDs - just in case
+ for (int K = 3; K != 40; K++)
+ fcntl(K,F_SETFD,FD_CLOEXEC);
+ }
+
+ return Process;
+}
+ /*}}}*/
+// ExecWait - Fancy waitpid /*{{{*/
+// ---------------------------------------------------------------------
+/* Waits for the given sub process. If Reap is set the no errors are
+ generated. Otherwise a failed subprocess will generate a proper descriptive
+ message */
+bool ExecWait(int Pid,const char *Name,bool Reap)
+{
+ if (Pid <= 1)
+ return true;
+
+ // Wait and collect the error code
+ int Status;
+ while (waitpid(Pid,&Status,0) != Pid)
+ {
+ if (errno == EINTR)
+ continue;
+
+ if (Reap == true)
+ return false;
+
+ return _error->Error("Waited, for %s but it wasn't there",Name);
+ }
+
+
+ // Check for an error code.
+ if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
+ {
+ if (Reap == true)
+ return false;
+ if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV)
+ return _error->Error("Sub-process %s recieved a segmentation fault.",Name);
+
+ if (WIFEXITED(Status) != 0)
+ return _error->Error("Sub-process %s returned an error code (%u)",Name,WEXITSTATUS(Status));
+
+ return _error->Error("Sub-process %s exited unexpectedly",Name);
+ }
+
+ return true;
+}
+ /*}}}*/
-// File::File - Open a file /*{{{*/
+// FileFd::Open - Open a file /*{{{*/
// ---------------------------------------------------------------------
/* The most commonly used open mode combinations are given with Mode */
-File::File(string FileName,OpenMode Mode, unsigned long Perms)
+bool FileFd::Open(string FileName,OpenMode Mode, unsigned long Perms)
{
- Flags = 0;
+ Close();
+ Flags = AutoClose;
switch (Mode)
{
case ReadOnly:
break;
case WriteEmpty:
- unlink(FileName.c_str());
- iFd = open(FileName.c_str(),O_RDWR | O_CREAT | O_EXCL,Perms);
- break;
+ {
+ struct stat Buf;
+ if (stat(FileName.c_str(),&Buf) == 0 && S_ISLNK(Buf.st_mode))
+ unlink(FileName.c_str());
+ iFd = open(FileName.c_str(),O_RDWR | O_CREAT | O_TRUNC,Perms);
+ break;
+ }
case WriteExists:
iFd = open(FileName.c_str(),O_RDWR);
break;
+
+ case WriteAny:
+ iFd = open(FileName.c_str(),O_RDWR | O_CREAT,Perms);
+ break;
}
if (iFd < 0)
- _error->Errno("open","Could not open file %s",FileName.c_str());
- else
- this->FileName = FileName;
+ return _error->Errno("open","Could not open file %s",FileName.c_str());
+
+ this->FileName = FileName;
+ SetCloseExec(iFd,true);
+ return true;
}
/*}}}*/
-// File::~File - Closes the file /*{{{*/
+// FileFd::~File - Closes the file /*{{{*/
// ---------------------------------------------------------------------
/* If the proper modes are selected then we close the Fd and possibly
unlink the file on error. */
-File::~File()
+FileFd::~FileFd()
{
Close();
}
/*}}}*/
-// File::Read - Read a bit of the file /*{{{*/
+// FileFd::Read - Read a bit of the file /*{{{*/
+// ---------------------------------------------------------------------
+/* We are carefull to handle interruption by a signal while reading
+ gracefully. */
+bool FileFd::Read(void *To,unsigned long Size,bool AllowEof)
+{
+ int Res;
+ errno = 0;
+ do
+ {
+ Res = read(iFd,To,Size);
+ if (Res < 0 && errno == EINTR)
+ continue;
+ if (Res < 0)
+ {
+ Flags |= Fail;
+ return _error->Errno("read","Read error");
+ }
+
+ To = (char *)To + Res;
+ Size -= Res;
+ }
+ while (Res > 0 && Size > 0);
+
+ if (Size == 0)
+ return true;
+
+ // Eof handling
+ if (AllowEof == true)
+ {
+ Flags |= HitEof;
+ return true;
+ }
+
+ Flags |= Fail;
+ return _error->Error("read, still have %u to read but none left",Size);
+}
+ /*}}}*/
+// FileFd::Write - Write to the file /*{{{*/
// ---------------------------------------------------------------------
/* */
-bool File::Read(void *To,unsigned long Size)
+bool FileFd::Write(const void *From,unsigned long Size)
{
- if (read(iFd,To,Size) != (signed)Size)
+ int Res;
+ errno = 0;
+ do
{
- Flags |= Fail;
- return _error->Errno("read","Read error");
- }
+ Res = write(iFd,From,Size);
+ if (Res < 0 && errno == EINTR)
+ continue;
+ if (Res < 0)
+ {
+ Flags |= Fail;
+ return _error->Errno("write","Write error");
+ }
+ From = (char *)From + Res;
+ Size -= Res;
+ }
+ while (Res > 0 && Size > 0);
+
+ if (Size == 0)
+ return true;
+
+ Flags |= Fail;
+ return _error->Error("write, still have %u to write but couldn't",Size);
+}
+ /*}}}*/
+// FileFd::Seek - Seek in the file /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool FileFd::Seek(unsigned long To)
+{
+ if (lseek(iFd,To,SEEK_SET) != (signed)To)
+ {
+ Flags |= Fail;
+ return _error->Error("Unable to seek to %u",To);
+ }
+
return true;
}
/*}}}*/
-// File::Write - Write to the file /*{{{*/
+// FileFd::Skip - Seek in the file /*{{{*/
// ---------------------------------------------------------------------
/* */
-bool File::Write(void *From,unsigned long Size)
+bool FileFd::Skip(unsigned long Over)
{
- if (write(iFd,From,Size) != (signed)Size)
+ if (lseek(iFd,Over,SEEK_CUR) < 0)
{
Flags |= Fail;
- return _error->Errno("write","Write error");
+ return _error->Error("Unable to seek ahead %u",Over);
}
return true;
}
/*}}}*/
-// File::Seek - Seek in the file /*{{{*/
+// FileFd::Truncate - Truncate the file /*{{{*/
// ---------------------------------------------------------------------
/* */
-bool File::Seek(unsigned long To)
+bool FileFd::Truncate(unsigned long To)
{
- if (lseek(iFd,To,SEEK_SET) != (signed)To)
+ if (ftruncate(iFd,To) != 0)
{
Flags |= Fail;
- return _error->Error("Unable to seek to %u",To);
+ return _error->Error("Unable to truncate to %u",To);
}
return true;
}
/*}}}*/
-// File::Size - Return the size of the file /*{{{*/
+// FileFd::Tell - Current seek position /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+unsigned long FileFd::Tell()
+{
+ off_t Res = lseek(iFd,0,SEEK_CUR);
+ if (Res == (off_t)-1)
+ _error->Errno("lseek","Failed to determine the current file position");
+ return Res;
+}
+ /*}}}*/
+// FileFd::Size - Return the size of the file /*{{{*/
// ---------------------------------------------------------------------
/* */
-unsigned long File::Size()
+unsigned long FileFd::Size()
{
struct stat Buf;
if (fstat(iFd,&Buf) != 0)
return Buf.st_size;
}
/*}}}*/
-// File::Close - Close the file if the close flag is set /*{{{*/
+// FileFd::Close - Close the file if the close flag is set /*{{{*/
// ---------------------------------------------------------------------
/* */
-bool File::Close()
+bool FileFd::Close()
{
bool Res = true;
if ((Flags & AutoClose) == AutoClose)
- if (close(iFd) != 0)
+ if (iFd >= 0 && close(iFd) != 0)
Res &= _error->Errno("close","Problem closing the file");
-
+ iFd = -1;
+
if ((Flags & Fail) == Fail && (Flags & DelOnFail) == DelOnFail &&
FileName.empty() == false)
if (unlink(FileName.c_str()) != 0)
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