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Pipes now return 0 (EOF) if no data and no fds can write.

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This commit is contained in:
Jonas 'Sortie' Termansen 2012-03-01 14:31:12 +01:00
parent 982b9a732a
commit 9c193777a9
1 changed files with 16 additions and 0 deletions
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16
sortix/pipe.cpp
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@ -51,6 +51,8 @@ namespace Sortix
size_t bufferused; size_t bufferused;
Event readevent; Event readevent;
Event writeevent; Event writeevent;
bool anyreading;
bool anywriting;
public: public:
virtual ssize_t Read(byte* dest, size_t count); virtual ssize_t Read(byte* dest, size_t count);
@ -58,6 +60,10 @@ namespace Sortix
virtual bool IsReadable(); virtual bool IsReadable();
virtual bool IsWritable(); virtual bool IsWritable();
public:
void NotReading();
void NotWriting();
}; };
DevPipeStorage::DevPipeStorage(byte* buffer, size_t buffersize) DevPipeStorage::DevPipeStorage(byte* buffer, size_t buffersize)
@ -66,6 +72,8 @@ namespace Sortix
this->buffersize = buffersize; this->buffersize = buffersize;
this->bufferoffset = 0; this->bufferoffset = 0;
this->bufferused = 0; this->bufferused = 0;
this->anyreading = true;
this->anywriting = true;
} }
DevPipeStorage::~DevPipeStorage() DevPipeStorage::~DevPipeStorage()
@ -93,6 +101,8 @@ namespace Sortix
return amount + Read(dest + amount, count - amount); return amount + Read(dest + amount, count - amount);
} }
if ( !anywriting ) { return 0; }
Error::Set(EBLOCKING); Error::Set(EBLOCKING);
readevent.Register(); readevent.Register();
return -1; return -1;
@ -100,6 +110,7 @@ namespace Sortix
ssize_t DevPipeStorage::Write(const byte* src, size_t count) ssize_t DevPipeStorage::Write(const byte* src, size_t count)
{ {
if ( !anyreading ) { /* TODO: SIGPIPE */ }
if ( count == 0 ) { return 0; } if ( count == 0 ) { return 0; }
if ( bufferused < buffersize ) if ( bufferused < buffersize )
{ {
@ -120,6 +131,9 @@ namespace Sortix
return -1; return -1;
} }
void DevPipeStorage::NotReading() { anyreading = false; }
void DevPipeStorage::NotWriting() { anywriting = false; }
class DevPipeReading : public DevStream class DevPipeReading : public DevStream
{ {
public: public:
@ -148,6 +162,7 @@ namespace Sortix
DevPipeReading::~DevPipeReading() DevPipeReading::~DevPipeReading()
{ {
((DevPipeStorage*) stream)->NotReading();
stream->Unref(); stream->Unref();
} }
@ -200,6 +215,7 @@ namespace Sortix
DevPipeWriting::~DevPipeWriting() DevPipeWriting::~DevPipeWriting()
{ {
((DevPipeStorage*) stream)->NotWriting();
stream->Unref(); stream->Unref();
} }