You can use strace on a specific pid to figure out what a specific process is doing, e.g.:
strace -fp <pid>
You might see something like:
select(9, [3 5 8], [], [], {0, 999999}) = 0 (Timeout)
| #ifndef __FINK_ENDIANDEV_PKG_ENDIAN_H__ | |
| #define __FINK_ENDIANDEV_PKG_ENDIAN_H__ 1 | |
| /** compatibility header for endian.h | |
| * This is a simple compatibility shim to convert | |
| * BSD/Linux endian macros to the Mac OS X equivalents. | |
| * It is public domain. | |
| * */ | |
| #ifndef __APPLE__ |