#include <wvshmzone.h>
Inheritance diagram for WvShmZone:
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.
Public Member Functions | |
WvShmZone (size_t size) | |
Creates a shared memory zone. | |
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 | noerr () |
Reset our error state - there's no error condition anymore. | |
Public Attributes | |
int | size |
void * | buf |
char * | cbuf |
unsigned char * | ucbuf |
Protected Attributes | |
int | errnum |
WvString | errstring |
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Creates a shared memory zone. "size" is the size of the zone in bytes |
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By default, returns true if geterr() == 0. Might be overridden so that isok() == false even though no error code has been specified. |
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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 WvX509Mgr. |
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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). |