MirrorBufferSet.cc File Reference

#include "common_priv.h"
#include "MirrorBufferSet.h"
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <assert.h>
#include <stdexcept>
#include <sys/mman.h>
#include <string.h>
#include <string>
#include <vector>

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Macros
#define	MirrorBufferSet_SUPPORTED   1
#define	MBS_USE_POSIX_SHM   0
#define	MAP_FAILED   ((void*)-1)
#define	MAP_NORESERVE   (0)
#define	MirrorBufferSet_VERBOSITY   0
#define	fprintf1(p)
#define	fprintf2(p)

Functions
std::string	StrError (int error)

Macro Definition Documentation

#define fprintf1

(

p

)

Definition at line 129 of file MirrorBufferSet.cc.

Referenced by MirrorBufferSet::MirrorBufferSet().

#define fprintf2

(

p

)

Definition at line 135 of file MirrorBufferSet.cc.

Referenced by MirrorBufferSet::GetFileDescriptor(), MirrorBufferSet::MirrorBufferSet(), and MirrorBufferSet::~MirrorBufferSet().

#define MAP_FAILED   ((void*)-1)

Definition at line 60 of file MirrorBufferSet.cc.

Referenced by MirrorBufferSet::MirrorBufferSet().

#define MAP_NORESERVE   (0)

Definition at line 65 of file MirrorBufferSet.cc.

Referenced by MirrorBufferSet::MirrorBufferSet().

#define MBS_USE_POSIX_SHM   0

Definition at line 22 of file MirrorBufferSet.cc.

#define MirrorBufferSet_SUPPORTED   1

Definition at line 10 of file MirrorBufferSet.cc.

#define MirrorBufferSet_VERBOSITY   0

Definition at line 123 of file MirrorBufferSet.cc.

Function Documentation

std::string StrError

(

int

error

)

Definition at line 68 of file MirrorBufferSet.cc.

References UNKNOWN_ERROR.

Referenced by MirrorBufferSet::MirrorBufferSet().

                              {
    static const char UNKNOWN_ERROR[] = "Unknown error";
    std::vector<char> errstr(256, '\0');
    do {
#if defined(__APPLE__)
        // if __APPLE__ strerror_r is declared to return an int
        int err = strerror_r(error, &errstr[0], errstr.size());
        if (err == 0) {
            return &errstr[0];
        } else {
            if (errno == ERANGE) {
                errstr.resize(2*errstr.size(), '\0');
            } else {
                return UNKNOWN_ERROR;
            }
        }
#else
        char *str = strerror_r(error, &errstr[0], errstr.size());

        // Wierdness with different versions of strerror... From the man page:
        //
        //  The strerror() and strerror_r() functions return the appropriate
        //  error description string, or an "Unknown error nnn" message if the
        //  error number is unknown.
        //
        //  The XSI-compliant strerror_r() function returns 0 on success; on
        //  error, -1 is returned and errno is set to indicate the error.
        //
        // So str can be ether an error code OR a pointer to the error
        // string...  wierdness.

        if (str == (char*)-1) {
            if (errno == ERANGE) {
                errstr.resize(2*errstr.size(), '\0');
            } else {
                 return UNKNOWN_ERROR;
            }
        } else if (str == 0) {
            return &errstr[0];
        } else {
            return str;
        }
#endif
    } while (true);
}

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