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Programming
printing ppid,child pid,pid
Post 47045 by a25khan on Sunday 1st of February 2004 11:48:22 PM
02-02-2004
perderabo,
yeah it makes sense that both child and process will execute the 3 staments, giving 6 results.
is the output in order of child,child,child,parent,parent,parent
now can u correct me if i m wrong here
0 - is the return int value that is always passed to the child to the child
this one is executed by printf("%d\n",pid);
28873 - is the pid of the child which is contained in the parent
this also executed by printf("%d\n",getpid());
28872 - is the pid of the parent
it is executed by printf("%d\n",getppid());
now running for parent
28873 - is the pid of the child
it is executed by printf("%d\n",pid);
28872 - is the pid of the parent that makes the child here
it is executed by printf("%d\n",getpid());
28086 - is the pid of the shell running this program
it is executed by printf("%d\n",getppid());
arrrrrrrrgh
i am confuuuuuuuused!
Hope i got that right
Sorry i am slow and ask too many questions
yeah it makes sense that both child and process will execute the 3 staments, giving 6 results.
is the output in order of child,child,child,parent,parent,parent
now can u correct me if i m wrong here
0 - is the return int value that is always passed to the child to the child
this one is executed by printf("%d\n",pid);
28873 - is the pid of the child which is contained in the parent
this also executed by printf("%d\n",getpid());
28872 - is the pid of the parent
it is executed by printf("%d\n",getppid());
now running for parent
28873 - is the pid of the child
it is executed by printf("%d\n",pid);
28872 - is the pid of the parent that makes the child here
it is executed by printf("%d\n",getpid());
28086 - is the pid of the shell running this program
it is executed by printf("%d\n",getppid());
arrrrrrrrgh
i am confuuuuuuuused!Hope i got that right
Sorry i am slow and ask too many questions
Last edited by a25khan; 02-02-2004 at 12:57 AM..
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LEARN ABOUT SUNOS
preap
preap(1) User Commands preap(1) NAME
preap - force a defunct process to be reaped by its parent SYNOPSIS
preap [-F] pid... DESCRIPTION
A defunct (or zombie) process is one whose exit status has yet to be reaped by its parent. The exit status is reaped via the wait(3C), waitid(2), or waitpid(3C) system call. In the normal course of system operation, zombies may occur, but are typically short-lived. This may happen if a parent exits without having reaped the exit status of some or all of its children. In that case, those children are reparented to PID 1. See init(1M), which periodically reaps such processes. An irresponsible parent process may not exit for a very long time and thus leave zombies on the system. Since the operating system destroys nearly all components of a process before it becomes defunct, such defunct processes do not normally impact system operation. However, they do consume a small amount of system memory. preap forces the parent of the process specified by pid to waitid(3C) for pid, if pid represents a defunct process. preap will attempt to prevent the administrator from unwisely reaping a child process which might soon be reaped by the parent, if: o The process is a child of init(1M). o The parent process is stopped and might wait on the child when it is again allowed to run. o The process has been defunct for less than one minute. OPTIONS
The following option is supported: -F Forces the parent to reap the child, overriding safety checks. OPERANDS
The following operand is supported: pid Process ID list. EXIT STATUS
The following exit values are returned by preap, which prints the exit status of each target process reaped: 0 Successfully operation. non-zero Failure, such as no such process, permission denied, or invalid option. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWesu (32-bit) | +-----------------------------+-----------------------------+ | |SUNWesxu (64-bit) | +-----------------------------+-----------------------------+ SEE ALSO
proc(1), init(1M), waitid(2), wait(3C), waitpid(3C), proc(4), attributes(5) WARNINGS
preap should be applied sparingly and only in situations in which the administrator or developer has confirmed that defunct processes will not be reaped by the parent process. Otherwise, applying preap may damage the parent process in unpredictable ways. SunOS 5.10 26 Mar 2001 preap(1)