source: trunk/Cocoa/Pester/Source/MoreSecurity/MoreUNIX.h@ 118

/*
        File:           MoreUNIX.h

        Contains:       Generic UNIX utilities.

        Written by:     Quinn

        Copyright:      Copyright (c) 2002 by Apple Computer, Inc., All Rights Reserved.

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        Change History (most recent first):

$Log: MoreUNIX.h,v $
Revision 1.2  2002/11/14 20:15:23  eskimo1
In MoreUNIXCopyFile, correctly set the modified and accessed times of the resulting file.

Revision 1.1  2002/11/09 00:15:24  eskimo1
A collection of useful UNIX-level routines.


*/

#pragma once

/////////////////////////////////////////////////////////////////

// MoreIsBetter Setup

#include "MoreSetup.h"

#if !TARGET_RT_MAC_MACHO
        #error MoreUNIX requires the use of Mach-O
#endif

// System prototypes

#include <stdlib.h>

/////////////////////////////////////////////////////////////////

#ifdef __cplusplus
extern "C" {
#endif

// Macros that act like functions to convert OSStatus error codes to errno-style 
// error codes, and vice versa.  Right now these are just pass throughs because 
// OSStatus errors are 32 bit signed values that are generally negative, and 
// errno errors are 32 bit signed values that are small positive.

#define OSStatusToEXXX(os) ((int) (os))
#define EXXXToOSStatus(ex) ((OSStatus) (ex))

// A mechanism to extra errno if a function fails.  You typically use this as 
//
//   fd = open(...);
//   err = MoreUNIXErrno(fd);
//
// or
//
//   err = setuid(0);
//   err = MoreUNIXErrno(err);

#if MORE_DEBUG

        extern int MoreUNIXErrno(int result);

#else

        #define MoreUNIXErrno(err) (((err) < 0) ? errno : 0)

#endif

/////////////////////////////////////////////////////////////////

extern int MoreGetExecutablePath(char *execPath, size_t *execPathSize);
        // Returns the path to the current executable in execPath. 
        // On input, execPathSize is the size of the execPath buffer.
        // On output, execPathSize is the size of the path placed in 
        // that buffer.
        // Result is an errno error code.

/////////////////////////////////////////////////////////////////

extern int MoreUNIXRead( int fd,       void *buf, size_t bufSize, size_t *bytesRead   );
        // A wrapper around "read" that keeps reading until either 
        // bufSize bytes are read or until EOF is encountered, 
        // in which case you get EPIPE.
        //
        // If bytesRead is not NULL, *bytesRead will be set to the number 
        // of bytes successfully read.

extern int MoreUNIXWrite(int fd, const void *buf, size_t bufSize, size_t *bytesWritten);
        // A wrapper around "write" that keeps writing until either 
        // all the data is written or an error occurs, in which case 
        // you get EPIPE.
        //
        // If bytesWritten is not NULL, *bytesWritten will be set to the number 
        // of bytes successfully written.

extern int MoreUNIXIgnoreSIGPIPE(void);
        // Sets the handler for SIGPIPE to SIG_IGN.  If you don't call 
        // this, writing to a broken pipe will cause SIGPIPE (rather 
        // than having "write" return EPIPE), which is hardly ever 
        // what you want.

extern int MoreUNIXCopyDescriptorToDescriptor(int source, int dest);
        // A naive copy engine, that copies from source to dest 
        // until EOF is encountered on source.  Not meant for 
        // copying large amounts of data.
        
extern int MoreUNIXCopyFile(const char *source, const char *dest);
        // A very naive file copy implementation, that just opens 
        // up source and dest and copies the contents across 
        // using MoreUNIXCopyDescriptorToDescriptor.
        // It does, however, handle setting the mode and access/modification 
        // times of dest properly.

#ifdef __cplusplus
}
#endif