Local variable, global variable? Find the maximum stack space on the program

Recently, I have seen some interesting information related to programs and memory. It can reflect the memory relationship between global data and local variables. The result I run on cygwin is that the stack space is only 2 MB. After it is used up, the program stops running. The source code is as follows:

Filename: depletestacksize. c
# Include

Static long stack_block_header;

Void depletestackspace () {// declare local variable for booking some stack spaces.

Int intvarinstackspace = 0; // output the memory offset

Printf ("% 3.1fm/N", (stack_block_header-(long) (& intvarinstackspace) * 1.0)/(1024*1024); // self recursive depletestackspace ();

}

 

Int main () {// The first local variable in application memory.

Int intvarinstackspace = 0; // get first local variable address as the stack block Header

Stack_block_header = (long) (& intvarinstackspace); // perform depletion

Depletestackspace (); // out the normal Exit message

Printf ("normal exit./N ");}

 

Compile the Win32 program with GCC in cygwin:

[Root @ sharkwang temp] # gcc-MnO-cygwin-O depletestacksize.exe depletestacksize. c

 

The execution result is excerpted as follows:
2.0 m
2.0 m
2.0 m <--- % 3.1f is rounded up after formatting, so 1.5xxm and above are changed to m
2.0 m
2.0 m
2.0 m
2.0 m
2.0 m <--- the program stops after reaching the maximum space, and no output of normal exit is displayed...
[Root @ sharkwang temp] #