linux - In C++, fork and kill not killing all the child processes -


i have below code executes binary in child process, wait 1 sec , if it's not done kill it.

     pid_t pid;      pid=fork();      if (pid == 0)      {          //in child          execl("/bin/sh", "sh", "-c", "/opt/qcom/bin/version.out > /tmp/version", (char *)null);          exit(0);      }      else      {          // in parent, wait 1 second          sleep(1);          int status;          if (waitpid(pid, &status, wnohang) != pid)          {              //kill(pid, sigterm); //--> tried              kill(pid, sigkill);          }          fsmverdir("/tmp/version");          system("rm /tmp/version");      }

but it's not killing completely, see below ps output after running program 3 times (it created 3 version.out's), , "sh" appear zombie...

# ps | grep "version.out\|sh" 2012 root         0 z    [sh] 2013 root     13236 s    /opt/qcom/bin/version.out 2058 root         0 z    [sh] 2059 root     13236 s    /opt/qcom/bin/version.out 2092 root         0 z    [sh] 2093 root     13236 s    /opt/qcom/bin/version.out 2100 root      2360 s    grep version.out\|sh #

or, there way run command timeout in busybox linux?
like:

execlp("timeout","timeout","1","sh","-c","/opt/qcom/bin/version.out > /tmp/version",null);

there no timeout in busybox version, there alternative?

you creating shell (the child) in turn runs "version.out" (the grandchild).

you kill child thereby making zombie , orphaning grandchild. can collect child calling wait second time (it error-ed out first time or never have called kill) still won't accomplish goal of killing grandchild parent.


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