Fixed espy's bug with experimental

[apt.git] / apt-pkg / contrib / fileutl.cc

diff --git a/apt-pkg/contrib/fileutl.cc b/apt-pkg/contrib/fileutl.cc
index b6a64926d7473693a28a13171ff48d88949e3749..bc1681820ec044df53e712fc75bf64f8a6015ed1 100644 (file)
--- a/apt-pkg/contrib/fileutl.cc
+++ b/apt-pkg/contrib/fileutl.cc
@@ -1,6 +1,6 @@
 // -*- mode: cpp; mode: fold -*-
 // Description                                                         /*{{{*/
-// $Id: fileutl.cc,v 1.21 1999/02/16 04:18:35 jgg Exp $
+// $Id: fileutl.cc,v 1.26 1999/03/21 07:24:14 jgg Exp $
 /* ######################################################################
    
    File Utilities
@@ -38,14 +38,21 @@ bool CopyFile(FileFd &From,FileFd &To)
    
    // 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;
@@ -76,6 +83,11 @@ int GetLock(string File,bool Errors)
    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);
@@ -164,24 +176,39 @@ void SetNonBlock(int Fd,bool Block)
 // 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. */
+   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 / 1000000;
-   tv.tv_usec = timeout % 1000000;
+   tv.tv_sec = timeout;
+   tv.tv_usec = 0;
    if (write == true) 
-   {
-      if (select(Fd+1,0,&Set,0,(timeout != 0?&tv:0)) <= 0)
-         return false;
+   {      
+      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 
    {
-      if (select(Fd+1,&Set,0,0,(timeout != 0?&tv:0)) <= 0)
-         return false;
+      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;
@@ -238,16 +265,33 @@ FileFd::~FileFd()
                                                                        /*}}}*/
 // 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)
 {
-   if (read(iFd,To,Size) != (signed)Size)
+   int Res;
+   errno = 0;
+   do
    {
-      Flags |= Fail;
-      return _error->Errno("read","Read error");
-   }   
+      Res = read(iFd,To,Size);
+      if (Res < 0 && errno == EINTR)
+        continue;
+      if (Res < 0)
+      {
+        Flags |= Fail;
+        return _error->Errno("read","Read error");
+      }
       
-   return true;
+      To = (char *)To + Res;
+      Size -= Res;
+   }
+   while (Res > 0 && Size > 0);
+   
+   if (Size == 0)
+      return true;
+   
+   Flags |= Fail;
+   return _error->Error("read, still have %u to read but none left",Size);
 }
                                                                        /*}}}*/
 // FileFd::Write - Write to the file                                   /*{{{*/
@@ -255,13 +299,29 @@ bool FileFd::Read(void *To,unsigned long Size)
 /* */
 bool FileFd::Write(const void *From,unsigned long Size)
 {
-   if (write(iFd,From,Size) != (signed)Size)
+   int Res;
+   errno = 0;
+   do
    {
-      Flags |= Fail;
-      return _error->Errno("write","Write 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);
    
-   return true;
+   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                                     /*{{{*/
@@ -275,6 +335,20 @@ bool FileFd::Seek(unsigned long To)
       return _error->Error("Unable to seek to %u",To);
    }
    
+   return true;
+}
+                                                                       /*}}}*/
+// FileFd::Truncate - Truncate the file                                /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool FileFd::Truncate(unsigned long To)
+{
+   if (ftruncate(iFd,To) != 0)
+   {
+      Flags |= Fail;
+      return _error->Error("Unable to truncate to %u",To);
+   }
+   
    return true;
 }
                                                                        /*}}}*/