DOS ain't dead - C's system() & COMMAND.COM

C's system() & COMMAND.COM (Developers)

posted by alexfru, USA, 13.09.2014, 01:00

> if you want to be compatible to Borland or Microsoft, system("command") is
> equivalent to %COMSPEC%/c command, and there is no errorlevel returned
> from the executed command available.

Some compilers' DOS-specific implementation system() goes a bit further and tries to make sense of the command by checking the extension (.COM, .EXE, etc), if any, and checking the command against a [naturally never complete and accurate] list of internal commands of COMMAND.COM. Basically, if it's a .COM/.EXE, "COMMAND.COM /C" is avoided and the program is executed directly, which lets one get its exit code instead of 0 from COMMAND.COM. That's what I'm doing now as well.

> that's the way it is (and saves you a lot of work ;)

It doesn't save my anything if I care about the outcome of the function call.

Alex

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Complete thread:

C's system() & COMMAND.COM - alexfru, 11.09.2014, 21:26
- C's system() & COMMAND.COM - nidud, 11.09.2014, 23:22
  - C's system() & COMMAND.COM - alexfru, 12.09.2014, 02:55
    - C's system() & COMMAND.COM - nidud, 12.09.2014, 12:44
      - C's system() & COMMAND.COM - alexfru, 13.09.2014, 00:54
        C's system() & COMMAND.COM - nidud, 13.09.2014, 14:54
    - C's system() & COMMAND.COM - tom, 12.09.2014, 13:10
      - C's system() & COMMAND.COM - marcov, 12.09.2014, 20:00
        C's system() & COMMAND.COM - alexfru, 13.09.2014, 01:05
        C's system() & COMMAND.COM - marcov, 13.09.2014, 14:02
        C's system() & COMMAND.COM - alexfru, 13.09.2014, 14:21
        C's system() & COMMAND.COM - marcov, 13.09.2014, 16:50
        C's system() & COMMAND.COM - alexfru, 13.09.2014, 17:06
        C's system() & COMMAND.COM - marcov, 13.09.2014, 20:24
        C's system() & COMMAND.COM - alexfru, 16.09.2014, 23:27
        C's system() & COMMAND.COM - marcov, 17.09.2014, 13:03
        C's system() & COMMAND.COM - alexfru, 17.09.2014, 13:07
        C's system() & COMMAND.COM - bretjohn, 15.09.2014, 19:24
        C's system() & COMMAND.COM - alexfru, 16.09.2014, 23:24
        C's system() & COMMAND.COM - marcov, 17.09.2014, 13:04
        C's system() & COMMAND.COM - alexfru, 17.09.2014, 13:08
        C's system() & COMMAND.COM - bretjohn, 17.09.2014, 20:42
        C's system() & COMMAND.COM - alexfru, 17.09.2014, 22:53
        C's system() & COMMAND.COM - marcov, 18.09.2014, 12:18
        C's system() & COMMAND.COM - alexfru, 18.09.2014, 13:33
        C's system() & COMMAND.COM - Rugxulo, 18.09.2014, 15:20
        C's system() & COMMAND.COM - alexfru, 18.09.2014, 15:41
        C's system() & COMMAND.COM - Rugxulo, 01.11.2014, 23:48
        C's system() & COMMAND.COM - Rugxulo, 02.11.2014, 00:29
        C's system() & COMMAND.COM - marcov, 18.09.2014, 16:10
        C's system() & COMMAND.COM - marcov, 18.09.2014, 16:07
        C's system() & COMMAND.COM - Rugxulo, 18.09.2014, 07:27
        C's system() & COMMAND.COM - bretjohn, 18.09.2014, 18:14
        C's system() & COMMAND.COM - Rugxulo, 01.11.2014, 23:32
      - C's system() & COMMAND.COM - alexfru, 13.09.2014, 01:00