WvShmZone Class Reference

#include <wvshmzone.h>

Inheritance diagram for WvShmZone:

[legend]
List of all members.

Detailed Description

Represents a shared-memory zone via mmap().

If you create one of these, its buf element will be shared across fork() and you can use it for various things such as a circular queue, semaphore, etc.

Definition at line 20 of file wvshmzone.h.

Public Member Functions

 WvShmZone (size_t size)
 Creates a shared memory zone.
 ~WvShmZone ()
virtual bool isok () const
 By default, returns true if geterr() == 0.
virtual int geterr () const
 If isok() is false, return the system error number corresponding to the error, -1 for a special error string (which you can obtain with errstr()) or 0 on end of file.
virtual WvString errstr () const
virtual void seterr (int _errnum)
 Set the errnum variable -- we have an error.
void seterr (WvStringParm specialerr)
void seterr (WVSTRING_FORMAT_DECL)
void seterr (const WvErrorBase &err)
void seterr_both (int _errnum, WvStringParm specialerr)
void noerr ()
 Reset our error state - there's no error condition anymore.

Static Public Member Functions

static WvString strerror (int errnum)
 A replacement for the operating system strerror() function that can map more kinds of error strings (especially in win32).

Public Attributes

int size
union {
   void *   buf
   char *   cbuf
   unsigned char *   ucbuf
}; 

Protected Attributes

int errnum
WvString errstring


Constructor & Destructor Documentation

WvShmZone::WvShmZone ( size_t  size  ) 

Creates a shared memory zone.

"size" is the size of the zone in bytes

Definition at line 16 of file wvshmzone.cc.

References buf, WvErrorBase::seterr(), and size.


Member Function Documentation

virtual bool WvErrorBase::isok (  )  const [inline, virtual, inherited]

By default, returns true if geterr() == 0.

Might be overridden so that isok() == false even though no error code has been specified.

Reimplemented in IWvStream, WvBufStream, WvDSAKey, WvDsp, WvEncoderStream, WvFdStream, WvHTTPStream, WvIStreamList, WvLog, WvRSAKey, WvSSLStream, WvStream, WvStreamClone, WvTCPConn, WvTimeoutStream, WvTimeStream, WvFileWatcher, WvX509Mgr, and _WvConStream.

Definition at line 39 of file wverror.h.

References WvErrorBase::errnum.

Referenced by WvX509Mgr::isok(), WvStream::isok(), WvCRLMgr::isok(), WvGlob::set(), and WvGlobDirIter::WvGlobDirIter().

virtual int WvErrorBase::geterr (  )  const [inline, virtual, inherited]

If isok() is false, return the system error number corresponding to the error, -1 for a special error string (which you can obtain with errstr()) or 0 on end of file.

If isok() is true, returns an undefined number.

Reimplemented in WvHTTPStream, WvStreamClone, and WvX509Mgr.

Definition at line 48 of file wverror.h.

References WvErrorBase::errnum.

Referenced by UniIniGen::commit(), WvX509Mgr::errstr(), WvStreamClone::errstr(), WvErrorBase::errstr(), WvError::get(), UniFileSystemGen::get(), WvX509Mgr::geterr(), WvStreamClone::geterr(), WvEncoderStream::isok(), WvConf::load_file(), WvLockDev::lock(), WvHTTPStream::pre_select(), UniIniGen::refresh(), WvConf::save(), WvStream::seterr(), WvErrorBase::seterr(), WvMagicCircle::WvMagicCircle(), and WvHttpPool::~WvHttpPool().

void WvErrorBase::seterr ( int  _errnum  )  [virtual, inherited]

Set the errnum variable -- we have an error.

If called more than once, seterr() doesn't change the error code away from the previous one. That way, we remember the _original_ cause of our problems.

Subclasses may want to override seterr(int) to shut themselves down (eg. WvStream::close()) when an error condition is set.

Note that seterr(WvString) will call seterr(-1).

Reimplemented in WvStream.

Definition at line 144 of file wverror.cc.

References WvErrorBase::errstring.

Referenced by WvX509Mgr::certreq(), WvX509Mgr::create_selfsigned(), WvX509Mgr::decode(), WvCRLMgr::decode(), WvX509Mgr::encode(), WvCRLMgr::encode(), WvRSAKey::getpem(), WvDSAKey::getpem(), WvX509Mgr::read_p12(), WvGlob::set(), WvError::set(), WvX509Mgr::set_pubkey(), WvStream::seterr(), WvErrorBase::seterr(), WvErrorBase::seterr_both(), WvX509Mgr::sign(), WvX509Mgr::signedbyCAinfile(), WvX509Mgr::test(), WvX509Mgr::unhexify(), WvX509Mgr::validate(), WvX509Mgr::verify(), WvX509Mgr::write_p12(), WvCRLMgr::WvCRLMgr(), WvDSAKey::WvDSAKey(), WvMagicCircle::WvMagicCircle(), WvPam::WvPam(), WvRSAKey::WvRSAKey(), WvShmZone(), and WvX509Mgr::WvX509Mgr().


The documentation for this class was generated from the following files:
Generated on Wed Jul 12 17:53:36 2006 for WvStreams by  doxygen 1.4.7