Hello. I want to make a child do some stuff,wait,then the parent does some stuff and then child does some stuff and waits again.I have made the following but it does not work.Can anybody help me?
Hi
I have a shell script A which calls another 10 shell scripts which run in background. How do i make the parent script wait for the child scripts complete, or in other words, i must be able to do a grep of parent script to find out if the child scripts are still running.
My Code:
... (1 Reply)
Hi All,
I will be glad if you could help me resolve this problem.
I have created two detachable threads and wanted to them execute independent of the parent thread ( the main task which creates the detachable threads). But I see no output coming from the execution of two detachable threads.... (4 Replies)
Hi All,
I have two ksh script. 1st script calls the 2nd script and the second script calls an 'C' program.
I want 1st script to wait until the 'C' program completes.
I cant able to get the process id for the 'C' program (child process) to make the 1st script to wait for the second... (7 Replies)
Hi All,
I facing a problem in handling signals between parent process communication. I am trying to send a signal(SIGINT) from child to parent. I am using kill function to do so and I am trying to read the signal using sigaction(). But the program is ending abruptly and I am not able to figure out... (4 Replies)
Hi, i want that the parent process start before the child, this code doesn't work,
if the child start before the parent it wait for signal, then the father send the signal SIGALRM and the child catch it and call printf;
else the father call printf and send the signal to the child that call its... (1 Reply)
1. The problem statement, all variables and given/known data:
I need to make an program that in a loop creates one parent and five children with fork(). The problem i'm trying to solve is how to delete the parent and child of the childīs process.
2. Relevant commands, code, scripts,... (0 Replies)
Hello, everyone.
Here's a program:
pid_t pid = fork();
if (0 == pid) // child process
{
execvp ...;
}
I send a signal (such as SIGINT) to the parent process, the child process receive the signal as well as the parent process.
However I don't want to child process to receive the... (7 Replies)
Hi everyone
i am very new to linux , working on bash shell.
I am trying to solve the given problem
1. Create a process and then create children using fork
2. Check the Status of the application for successful running.
3. Kill all the process(threads) except parent and first child... (2 Replies)
I have two scripts lets say A.expect and B.sh needs to be executed.
I am executing B.sh from A.expect where B.sh has sleep command.
My problem is that when B.sh encounters the sleep command my A.expect starts executing and exits.
but my A.expect should execute only after completing B.sh.
Is... (3 Replies)
Hi all,
I am starting mgen5 for sometime depends on input from a file, in a child process. now I want to make parent to wait in this child process till mgen5 finishes, or timeout happens.
could anyone please tell me how to make parent to wait in child process in shell script?
thanks... (2 Replies)
Discussion started by: girijajoshi
2 Replies
LEARN ABOUT MINIX
wait.h
wait.h(3HEAD) Headers wait.h(3HEAD)NAME
wait.h, wait - wait status
SYNOPSIS
#include <sys/wait.h>
DESCRIPTION
When a process waits for status from its children using either the wait(3C) or waitpid(3C) function, the status returned can be evaluated
with the following macros, defined in <sys/wait.h>. These macros evaluate to integral expressions. The stat argument to these macros is the
integer value returned from wait() or waitpid().
WCOREDUMP(stat) If the value of WIFSIGNALED (stat) is non-zero, this macro evaluates to a non-zero value if a core image of
the terminated child was created.
WEXITSTATUS(stat) If the value of WIFEXITED(stat) is non-zero, this macro evaluates to the exit code that the child process
passed to _exit() (see exit(2)) or exit(3C), or the value that the child process returned from main.
WIFCONTINUED(stat) Evaluates to a non-zero value if status was returned for a child process that has continued.
WIFEXITED(stat) Evaluates to a non-zero value if status was returned for a child process that terminated normally.
WIFSIGNALED(stat) Evaluates to a non-zero value if status was returned for a child process that terminated due to the receipt
of a signal.
WIFSTOPPED(stat) Evaluates to a non-zero value if status was returned for a child process that is currently stopped.
WSTOPSIG(stat) If the value of WIFSTOPPED(stat) is non-zero, this macro evaluates to the number of the signal that caused
the child process to stop.
WTERMSIG(stat) If the value of WIFSIGNALED(stat) is non-zero, this macro evaluates to the number of the signal that
caused the termination of the child process.
The <sys/wait.h> header defines the symbolic constants listed below for use with waitpid(3C).
WNOHANG Do not hang if no status is available; return immediately.
WUNTRACED Report status of stopped child process.
The symbolic constants listed below are defined as possible values for the options argument to waitid(2).
WEXITED Wait for processes that have exited.
WSTOPPED Status is returned for any child that has stopped upon receipt of a signal.
WCONTINUED Status is returned for any child that was stopped and has been continued.
WNOHANG Return immediately if there are no children to wait for.
WNOWAIT Keep the process whose status is returned in infop in a waitable state.
The type idtype_t is defined as an enumeration type whose possible values include the following:
P_ALL
P_PID
P_PGID
The id_t and pid_t types are defined as described in <sys/types.h>.
The siginfo_t type is defined as described in <signal.h>.
The rusage structure is defined as described in <sys/resource.h>.
Inclusion of the <sys/wait.h> header can also make visible all symbols from <signal.h> and <sys/resource.h>.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
SEE ALSO exit(2), waitid(2), exit(3C), wait(3C), waitpid(3C),attributes(5), standards(5)SunOS 5.10 10 Sep 2004 wait.h(3HEAD)