Thread: Catch all errors in app

  1. #1
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    Catch all errors in app

    Hi everybody.

    I have made some app that should be executed using crontab once a day.

    I want to receive email in case something going wrong during execution.
    Currently i have only one option. To create bash script that checks value returned by app and compares it to zero. In case it's not equal it sends email.

    Can it somehow bee included to C app?

    Thanks in advance.

  2. #2
    and the hat of int overfl Salem's Avatar
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    You can internally fork() inside your program to do the same thing.
    Code:
    pid_t p = fork();
    if ( p == 0 ) {
      // all your processing, which may crash
    } else if ( p == (pid_t)-1 ) {
      // fork failed
    } else {
      int status;
      waitpid(p,&status,0);
      if ( WIFSIGNALED(status) ) {
        // send your email
      }
    }
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

  3. #3
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    Do you know how to use SMTP via telnet? Do your SMTP server needs authentication?

  4. #4
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    Quote Originally Posted by flp1969 View Post
    Do you know how to use SMTP via telnet? Do your SMTP server needs authentication?
    Thanks for care
    I use libcurl for this purpose. This is already solved.

  5. #5
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    cron will automatically send an email to the crontab's owner if the program/script returns a non-zero status. So you could keep your program simple and exit with anything but 0 if there's an error (and possibly have your program print an error message to stderr, which gets included in the email from cron).

  6. #6
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    Quote Originally Posted by christop View Post
    cron will automatically send an email to the crontab's owner if the program/script returns a non-zero status. So you could keep your program simple and exit with anything but 0 if there's an error (and possibly have your program print an error message to stderr, which gets included in the email from cron).
    Yes it does. Just checked.
    Thanks a lot for that. You saved some time for me.

  7. #7
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    Salem,
    Thanks for your response.
    It does exectly what i was looking for.
    But i modified it a little. To condition after waitpid added WEXITSTATUS(stat).

    As soon as subject is solved it can be closed.

    Thanks a lot!
    Last edited by datswd; 04-29-2019 at 12:08 PM.

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