Question

I m assing file name dynamically using setenv as folows:

setenv("file.name",filename.c_str,1);

I m curious if this is per process?

If i have multiple processes running this code but taking different file names, would there be any collisions?

Lets say I have process 1

setenv("file.name",filename1.c_str,1);  

and process 2

setenv("file.name",filename1.c_str,1);  

would i have any problems doing this?

Thanks.

Answer 1

The environment you set with setenv() is per process. Essentially it is just a memory area in your process. At least, this is what does on UNIX systems. Unlike getenv() it isn’t part of either the C or the C++ standard but it is part of POSIX. What it does on non-POSIX systems, if it exists, may be something different.