神马文学网process control and management1
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A process is basically a single running program. It may be a ``system‘‘ program (e.g login, update, csh) or program initiated by the user (textedit, dbxtool or a user written one).
When UNIX runs a process it gives each process a unique number - a process ID, pid.
The UNIX command ps will list all current processes running on your machine and will list the pid.
The C function int getpid() will return the pid of process that called this function.
A program usually runs as a single process. However later we will see how we can make programs run as several separate communicating processes.
Running UNIX Commands from Cexecl()fork()wait()exit()
Piping in a C programpopen() - Formatted Pipingpipe() - Low level Piping
Interrupts and SignalsSending Signals - kill()Receiving signals - signal()
Dave.Marshall@cm.cf.ac.uk
Wed Sep 14 10:06:31 BST 1994
When UNIX runs a process it gives each process a unique number - a process ID, pid.
The UNIX command ps will list all current processes running on your machine and will list the pid.
The C function int getpid() will return the pid of process that called this function.
A program usually runs as a single process. However later we will see how we can make programs run as several separate communicating processes.
Running UNIX Commands from Cexecl()fork()wait()exit()
Piping in a C programpopen() - Formatted Pipingpipe() - Low level Piping
Interrupts and SignalsSending Signals - kill()Receiving signals - signal()
Dave.Marshall@cm.cf.ac.uk
Wed Sep 14 10:06:31 BST 1994
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