I am running an external program with the command execvp
, now I want to catch the exit code of the external program and if possible get the PID
of it.
Is there anyway possible?(I know I can read $?
in ubuntu and use ps faxu
but these are dirty ways for that)
The exec*
functions does not return when the program has successfully run, so you can't get the return code via execvp
. However, if you use fork
/ wait
, you could get the exit code from the status code in the wait*
functions:
int status;
if (wait(&status) != -1) { // similar for waitpid, wait4, etc.
if (WIFEXITED(status)) {
exit_code = WEXITSTATUS(status);
} else {
// handle other conditions, e.g. signals.
}
} else {
// wait failed.
}
You could check the example of in the man page of wait(2) .
Try also int a_number = std::system("/path/to/app")
This sometimes can be used to return the value of an xmessage query.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.