fix: removed deprecated call to vfork()
Don't close standard input or output descriptors on exec
Added filtering capabilities to Unix version of open_process()
Removed redundant include files
Call vfork() if supported with exec()
Added case for already closed process in list
Minor change should not affect anything
Made quitting rvu, rholo and rcontrib quicker with multiple processes on Unix
Simplified creation of child process
Bug fixes and performance improvements to rtrace -n option
Eliminated some compiler warnings.
Minor dependency cleanup
Fixed deadlock upon termination of mkillum with -n option
Added -n option to mkillum for multiprocessing on shared memory machine
Replaced all calls to vfork() with regular fork() calls
Removed redeclaration of fork() call + vfork.h header, using rtprocess.h instead
Added prototypes and includes from patch by Randolph Fritz. Added more required includes and reduced other compile warnings.
Abstracted process and path handling for Windows. Renamed FLOAT to RREAL because of conflict on Windows. Added conditional compiles for some signal handlers.
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