Re: system command returning unknown error.

14 Jun 2006

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Anyone else got an idea?
John Francini

On 14 Jun 2006, at 16:09, matt jaffa wrote:
I tried to switch to using the reboot(int howto) command instead of
system("/sbin/shutdown -r now")   and I am getting back errno = 1,
operation not permitted. I am running as root since I set setuid(0)
before running the command. And the permissions on my commandline app
allow me to setuid(0) as bad as some might think, this is the only way
this tool will work for our product.
But operation not permitted hasn't anything to do with priviliges I
think. Cause I can go to the terminal and do a sudo /sbin/reboot just
fine.
Yes I am running as a root process.

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I'm not sure what's going on then, unless it has something to do with
requiring the real UID to be root rather than 'merely' the effective
UID.  But then again, I may be talking through my hat.
On 6/14/06, matt jaffa <mjaffa@gmail.com> wrote:

On 6/14/06, John Francini <francini@mac.com> wrote:
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/sbin/shutdown must be run by root. Running as a user with
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Administrator privilege is not sufficient.
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Is the parent process running as root or setuid to root?
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John
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On 14 Jun 2006, at 15:15, matt jaffa wrote:
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Ok so I admit I read it wrong regarding the return status,
always got
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0 for everything else I executed so I assumed 0 good and only
-1 was
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returned if bad.
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soo I am getting 32256 by executing
system("/sbin/shutdown -r
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now");
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On 6/14/06, John Francini <francini@mac.com > wrote:
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Rather than having people say "Yes, I did, No, I didn't",
let's cut
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the Gordian knot.
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The man page on 10.4.6 reads as follows:
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SYSTEM(3)                BSD Library Functions Manual
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SYSTEM(3)
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NAME
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system -- pass a command to the shell
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LIBRARY
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Standard C Library (libc, -lc)
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SYNOPSIS
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#include <stdlib.h>
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int
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system(const char *string);
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DESCRIPTION
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The system() function hands the argument string to the
command
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inter-
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preter sh(1).  The calling process waits for the shell to
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finish execut-
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ing the command, ignoring SIGINT and SIGQUIT, and blocking
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SIGCHLD.
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If string is a NULL pointer, system() will return non-
zero if
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the command
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interpreter sh(1) is available, and zero if it is not.
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The system() function returns the exit status of the
shell as
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returned by
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waitpid(2), or -1 if an error occurred when invoking
fork(2) or
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waitpid(2).  A return value of 127 means the execution
of the
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shell
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failed.
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SEE ALSO
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sh(1), execve(2), fork(2), waitpid(2), popen(3)
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STANDARDS
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The system() function conforms to ISO/IEC 9899:1990 (``ISO
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C90'') and is
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expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.
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BSD                              June 4,
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1993                              BSD
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Given this, your error of 32256 is being generated by the
shell --
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meaning the command you ran exited with that status.
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It might be more helpful if you can give a concise example of
the
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specific code that is failing.
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John Francini
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On 14 Jun 2006, at 14:12, Matthew Jaffa wrote:
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Yes I read the man page, and it says -1 if not successful,
0 if
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successful, and returns non-zero if the command you pass in is
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NULL, but I know I didn't pass in null cause I log it right
before
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I execute the command.
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Matt
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From: "Justin C. Walker" < justin@mac.com>
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To: "darwin-dev@lists.apple.com list" <darwin-
dev@lists.apple.com >
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Subject: Re: system command returning unknown error.
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Date: Wed, 14 Jun 2006 10:38:46 -0700
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On Jun 14, 2006, at 10:30 , matt jaffa wrote:
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Hi,
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I am calling system(char* command) in my .cpp file. But
this is
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returning
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error 32256. This error no. is not documented so I don't
know
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why  it is not
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working.
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Anyone seen this error number before and know what it means.
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Did you read the man page for the 'system()' call?
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Regards,
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Justin
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--
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Justin C. Walker, Curmudgeon at Large
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Director
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Institute for the Enhancement of the Director's Income
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Nobody knows the trouble I've been
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