On Wed, Sep 30, 2009 at 4:06 PM, Rick McGuire <[email protected]> wrote:
> Nope, other than to point to the code responsible. This is handled in
> interpreter/platform/unix/ValueFunction.cpp.
A while back we added this code in PlatformDefinitions.h:
#ifdef __APPLE__
# include <crt_externs.h>
inline char **getEnvironment()
{
return (*_NSGetEnviron());
}
#else
inline char **getEnvironment()
{
extern char **environ;
return environ;
}
#endif
So, on OS X they are doing things slightly different and I guess that
is at the bottom of this. If I had a Mac to work on, I probably could
eventually figure this out, through brute force if nothing else. I'm
not too good at theoretically figuring this out. <grin>
For the unix ValueFunction.cpp in SetEnvrionmentVariable(), there is
this code that loops through every variable and compares the name
portion to the name passed in. If / when it finds a match, it marks
it for deletion:
for(;*Environment != NULL;Environment++){
np = *Environment;
/* extract the the name */
/* from the current env string */
for(i=0;(*np!='=')&&(i<255);np++,i++){
memcpy(&(namebufcurr[i]),np,1); /* copy the character */
}
memcpy(&(namebufcurr[i]),"\0",1); /* copy the terminator */
if(!strcmp(Name->getStringData(),namebufcurr))/* have a match ? */
del = *Environment; /* remember it for deletion */
}
Then, if the new value is not .nil it uses putevn() to add a new
string to the environ:
if (Value != (RexxString *) TheNilObject)
{
sprintf(Env_Var_String,
"%s=%s",Name->getStringData(),Value->getStringData());
putenv(Env_Var_String);
}
and if the name was found, the old name=value string is always freed:
if(del) /* if there was a old one */
free(del); /* free it */
I don't understand how that works. It obviously does on Linux, I just
walked through it. But, it is freeing some malloc'd memory, it
doesn't change anything. I don't see how that removes it from
environ.
So, I'm lost. I don't even really understand why it works on Linux.
--
Mark Miesfeld
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