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Problem due to Fork Error
Post 302212228 by Amey Joshi on Monday 7th of July 2008 02:19:17 AM
07-07-2008
Quote:
there are two approaches to this.
1) set a timer in the child - which generates SIGALRM after specified 'n' units of time, register handler for that signal and in the handler, it should terminate itself
2) have a controller program which takes care of creating new process on need, monitoring them and if it lives more than the threshold trigger it with a signal and accordingly in the child register handler for that signal and it should terminate.
Both the methods are doable, and you will have more control with the second approach, as number of child to be spawned, time for which child should live everything can be configured in the invoker process
1) set a timer in the child - which generates SIGALRM after specified 'n' units of time, register handler for that signal and in the handler, it should terminate itself
2) have a controller program which takes care of creating new process on need, monitoring them and if it lives more than the threshold trigger it with a signal and accordingly in the child register handler for that signal and it should terminate.
Both the methods are doable, and you will have more control with the second approach, as number of child to be spawned, time for which child should live everything can be configured in the invoker process
Can you please tell me Second Method in detail..means which all commands i have to use(any sample)
...I am quite new to unix.... 
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LEARN ABOUT BSD
fork
FORK(3F) FORK(3F) NAME
fork - create a copy of this process SYNOPSIS
integer function fork() DESCRIPTION
Fork creates a copy of the calling process. The only distinction between the 2 processes is that the value returned to one of them (referred to as the `parent' process) will be the process id of the copy. The copy is usually referred to as the `child' process. The value returned to the `child' process will be zero. All logical units open for writing are flushed before the fork to avoid duplication of the contents of I/O buffers in the external file(s). If the returned value is negative, it indicates an error and will be the negation of the system error code. See perror(3F). A corresponding exec routine has not been provided because there is no satisfactory way to retain open logical units across the exec. How- ever, the usual function of fork/exec can be performed using system(3F). FILES
/usr/lib/libU77.a SEE ALSO
fork(2), wait(3F), kill(3F), system(3F), perror(3F) 4.2 Berkeley Distribution May 27, 1986 FORK(3F)