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Subject: 1.3.4: error in inheriting new PATH environment form WIN32 executable to
 CYGWIN executable
To: cygwin AT cygwin DOT com
Message-ID: <OF4C6A95E3.F945D816-ONC1256AFD.0048D132@lossburg.arburg.com>
From: Heiko_Elger AT arburg DOT com
Date: Wed, 7 Nov 2001 14:33:08 +0100
MIME-Version: 1.0
Content-type: text/plain; charset=us-ascii

Hello,

I have the following problem:

If a MS WIN 32 program changes his environment PATH variable to a very long
value (over 270 characters) and than calling a CYGWIN program per system() call
the path inside the CYGWIN program is reset to NULL! If it calls a MS WIN 32
program all works fine.

We have this problem with clearmake in exporting a very long path and the shell
is the CYGWIN sh.exe.

I tried to reproduce it within a very small test.
I wrote two small programs (belwo you wil find the sourcecode):
   changeenv.c --> MS WIN 32 program which change his PATH environment and calls
per system() the program "printpath"
   printpath.c   --> prints the PATH environment to stdout

changeenv.exe is compiled with Microsoft Visual Studio.
printpath.exe is compiled with MS Visual Studio and cygwin gcc

I hope anyone can reproduce this error and give me a hint to resolve may
problem.

Best regards

   Heiko Elger


----------------------- start changeenv.c --------------------
#include <stdio.h>
#include <stdlib.h>

#define CYGWIN_SHELL        "d:\\programme\\cygwin\\bin\\sh"
#define CYGWIN_PRINTPATH    "d:\\msdev\\makenv\\printpath\\printpath"
#define WIN32_PRINTPATH     "d:\\msdev\\makenv\\printpath\\Debug\\printpath"

char long_path[]
= "PATH=/usr/bin:/1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890"

;

int main (int argc, char ** argv, char **env)
{
    int rc=0;
    char * env_path ;

    if (putenv(long_path) == -1)
        perror("putenv()");

    env_path = getenv("PATH");
    printf("NEW Path=%s\n", env_path == NULL ? "" : env_path);
    if (system( CYGWIN_SHELL " -ic \"echo system CYGWIN SHELL PATH=$PATH\"") !=
0)
        perror("system()");
    printf("system CYGWIN printpath: "); fflush( stdout );
    if (system( CYGWIN_PRINTPATH ) != 0)
        perror("system()");
    printf("system WIN32 printpath: "); fflush( stdout );
    if (system( WIN32_PRINTPATH ) != 0)
        perror("system()");

    return rc;
}
----------------------- end changeenv.c --------------------

----------------------- start printpath.c --------------------
#include <stdio.h>
#include <stdlib.h>

int main (int argc, char ** argv, char **env)
{
    int rc=0;
    char * env_path ;

    env_path = getenv("PATH");
    printf("Path=%s\n", env_path == NULL ? "" : env_path);

    return rc;
}----------------------- end printpath.c --------------------


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