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Message-ID: <d46153c40501210642184b3371@mail.gmail.com>
Date: Fri, 21 Jan 2005 08:42:52 -0600
From: Andrew Paulsen <andrew DOT paulsen AT gmail DOT com>
To: djgpp AT delorie DOT com
Subject: RE: ls.exe in execv
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Reply-To: djgpp AT delorie DOT com

>> does anybody know if there is a solution for not hanging when run 
>> execv()? it seems that running notepad.exe is fine, however, running 
>> "ls.exe" compiled with djgpp will hangup the application. Here is the 
>> the sample code.
>> 
>> #include <windows.h>
>> #include <stdio.h>
>> int main() {
>>      char ** environ=_environ;/**** SYSTEM DEFINED ENVIRONMENT POINTER */
>>      int retval;
>> 
>>      /* this is OK
>>      char *argv[] = {"C:\\WINDOWS\\SYSTEM32\\notepad.exe", NULL};
>>      retval = execv("C:\\WINDOWS\\SYSTEM32\\notepad.exe",  argv);
>>      */
>> 
>>      /*  this will hang
>>      */
>>      char *argv[] = {"C:\\bin\\ls.exe", "C:\\", NULL};
>>      retval = execv("C:\\bin\\ls.exe",  argv);
>> 
>>      printf("if successful, this should not be printed out\n");
>>      if(retval == -1) {
>>          fprintf(stderr, "ERROR: 'exec' failed\n");
>>          perror("exec");
>>          exit(-1);
>>      }
>>      exit(0);
>> }

I think there are a couple problems with this.  First, you may not
want to destroy argv[] like that so I'd change it to a different name.
 Second, why are you passing the path to ls in the argv[] parameter? 
The following worked for me:

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
int main() {
	int retval;

	char *myArgv[] = {"C:\\", NULL};
	retval = execv("C:\\djgpp\\bin\\ls.exe",  myArgv);

	printf("if successful, this should not be printed out\n");
	if(retval == -1) {
		perror("exec");
		exit(-1);
	}
	exit(0);
}

Andrew