07-01-2008
First of all it's not a void function, this fuction returns pointer (void *).
There is nothing wrong if function returns null pointer, usually meaning it failed to do job as expected.
Check if you don't derefernce this pointer without null pointer check.
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GCORE(1) General Commands Manual GCORE(1)
NAME
gcore - get core image of running process
SYNOPSIS
gcore [-s][-c core] pid
DESCRIPTION
gcore creates a core image of each specified process, suitable for use with adb(1). By default the core image is written to the file
<pid>.core.
The options are:
-c Write the core file to the specified file instead of <pid>.core.
-s Stop the process while creating the core image and resume it when done. This makes sure that the core dump will be in a consistent
state. The process is resumed even if it was already stopped. Of course, you can obtain the same result by manually stopping the
process with kill(1).
The core image name was changed from core.<pid> to <pid>.core to prevent matching names like core.h and core.c when using programs such as
find(1).
FILES
<process-id>.core The core image.
BUGS
If gcore encounters an error while creating the core image and the -s option was used the process will remain stopped.
Swapped out processes and system processes (the swapper) may not be gcore'd.
4.2 Berkeley Distribution April 15, 1994 GCORE(1)