WvStreams
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A circular queue that can be accessed across fork(). More...
#include <wvmagiccircle.h>
Public Member Functions | |
WvMagicCircle (size_t size) | |
Creates a shared memory circular queue. More... | |
size_t | used () |
size_t | left () |
size_t | put (const void *data, size_t len) |
size_t | get (void *data, size_t len) |
size_t | skip (size_t len) |
const char * | wstype () const |
virtual bool | isok () const |
By default, returns true if geterr() == 0. More... | |
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. More... | |
virtual WvString | errstr () const |
virtual void | seterr (int _errnum) |
Set the errnum variable – we have an error. More... | |
void | seterr (WvStringParm specialerr) |
void | seterr (WVSTRING_FORMAT_DECL) |
void | seterr (const WvErrorBase &err) |
void | seterr_both (int _errnum, WvStringParm specialerr) |
void | seterr_both (int _errnum, WVSTRING_FORMAT_DECL) |
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). | |
Protected Attributes | |
WvShmZone | shm |
volatile int & | head |
volatile int & | tail |
int | size |
char * | circle |
int | errnum |
WvString | errstring |
A circular queue that can be accessed across fork().
Definition at line 14 of file wvmagiccircle.h.
WvMagicCircle::WvMagicCircle | ( | size_t | size | ) |
Creates a shared memory circular queue.
"size" is the number of elements to store
Definition at line 11 of file wvmagiccircle.cc.
References WvErrorBase::geterr(), and WvErrorBase::seterr().
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inlinevirtualinherited |
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, WvEncoderStream, WvReadLineStream, WvTCPConn, WvNullListener, WvFdStream, WvLog, WvStream, WvStreamClone, WvSSLStream, WvDBusServer, WvDSAKey, WvTimeStream, WvBufStream, WvListener, WvTimeoutStream, WvIStreamList, and _WvConStream.
Definition at line 39 of file wverror.h.
Referenced by WvListener::isok(), WvStream::isok(), and WvGlob::set().
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inlinevirtualinherited |
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 WvStreamClone, and WvDBusServer.
Definition at line 48 of file wverror.h.
Referenced by UniIniGen::commit(), UniFileSystemGen::get(), WvDBusServer::geterr(), WvStreamClone::geterr(), WvEncoderStream::isok(), UniConfDaemon::listen(), WvStream::seterr(), and WvMagicCircle().
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virtualinherited |
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.
Referenced by WvUnixListener::accept(), WvTCPListener::accept(), WvDSAKey::getpem(), WvGlob::set(), WvStream::seterr(), WvMagicCircle(), WvPam::WvPam(), WvShmZone::WvShmZone(), and WvTCPListener::WvTCPListener().