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Since all processes are identifiable by a single PID, the PID can be used to manage that process, by means of a signal. Signals can be sent to other processes in C programs using the signal() function, or they can be sent directly from within the shell. Solaris supports a number of standard signal types that can be used as a means of interprocess communication. A common use for signals is to manage user applications that are launched from a shell. For example, you can send to an application running in the foreground a suspend signal by pressing CTRL-Z at any time. To run this application in the background in the C-shell, for example, you would need to type bg at the command prompt. A unique background job number is then assigned to the job. To bring the process back to the foreground, you type fg n, where n is its job number. You can run as many applications as you like in the background. In the following example, httpd is run in the foreground. When you press CTRL-Z, the process is suspended, and when you type bg, it is assigned the background process number 1. You can then execute other commands, such as ls, while httpd runs in the background. When you then type fg, the process is brought once again into the foreground.
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client 1% httpd ^z Suspended client 2% bg [1] httpd&
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client 3% ls httpd.conf access.conf client 4% fg
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A useful command is the kill command, which is used to send signals directly to any process on the system. It is usually called with two parameters the signal type and the PID. For example, if you have made changes to the configuration file for the Internet super daemon, you must send a signal to the daemon to tell it to reread its configuration file. Note that you don t need to restart the daemon itself: this is one of the advantages of a process-based operating system that facilitates interprocess communication. If inetd had the PID 167, typing
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# kill -1 167
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would force inetd to reread its configuration file and update its internal settings. The 1 parameter stands for the SIGHUP signal, which means hang up. However, imagine a situation in which you want to switch off inetd temporarily to perform a security check. You can send a kill signal to the process by using the 9 parameter (the SIGKILL signal):
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# kill -9 167
Although SIGHUP and SIGKILL are the most commonly used signals in the shell, several others are used by programmers and are defined in the signal.h header file. Another potential consequence of sending a signal to a process is that instead of hanging up or being killed, the process could exit and dump a core file, which is a memory image of the process to which the message was sent. This result is useful for debugging, although too many core files will quickly fill up your file system! You can always obtain a list of available signals to the kill command by passing the l option:
$ kill -l HUP INT QUIT ILL TRAP ABRT EMT FPE KILL BUS SEGV SYS PIPE ALRM TERM USR1 USR2 CLD PWR WINCH URG POLL STOP TSTP CONT TTIN TTOU VTALRM PROF XCPU XFSZ WAITING LWP FREEZE THAW RTMIN RTMIN+1 RTMIN+2 RTMIN+3 RTMAX-3 RTMAX-2 RTMAX-1 RTMAX
Procedures
The following procedures are commonly used to manage processes.
Listing Processes
You can use the ps command to list all currently active processes on the local system. By default, ps prints the processes belonging to the user who issues the ps command:
Part II:
System Essentials
$ ps PID TTY TIME CMD 29081 pts/8 0:00 ksh
The columns in the default ps list are the process identifier (PID), the terminal from which the command was executed (TTY), the CPU time consumed by the process (TIME), and the actual command that was executed (CMD), including any command-line options passed to the program. Alternatively, if you would like more information about the current user s processes, you can add the f parameter:
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