vamsi krishna wrote:
Hello All,
o Where is the environment (all environment variables) mapped in the
process virtual address space? is it on the heap? or on the stack?
% cat > test.c
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main()
{
printf("0x%x\n", getenv("HOME"));
pause();
}
% cc -o test test.c
% ./test &
[1] 7184
0x8047c0c %
% pmap 7184
7184:: ./test
08046000 8K rwx-- [ stack ]
08050000 4K r-x-- /tmp/test
08060000 4K rwx-- /tmp/test
BFEC0000 24K rwx-- [ anon ]
BFED0000 4K rwx-- [ anon ]
BFEE0000 760K r-x-- /lib/libc.so.1
BFFAE000 24K rw--- /lib/libc.so.1
BFFB4000 8K rw--- /lib/libc.so.1
BFFC6000 148K r-x-- /lib/ld.so.1
BFFFB000 4K rwx-- /lib/ld.so.1
BFFFC000 8K rwx-- /lib/ld.so.1
total 996K
%
So the answer clearly is stack.
o Also I have seen some code long back which uses 'char *environ' to
create a new environment, is this documented some where? (man n
environ) doesnt give me any information about this 'char *environ'
variable.
That should be
char *environ[];
which contains a set of character strings of the form NAME=VALUE
You can read this, but you do so at your peril if other threads are busy
modifying it.
--
Bart Smaalders Solaris Kernel Performance
[EMAIL PROTECTED] http://blogs.sun.com/barts
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