Re: system command returning unknown error.
Re: system command returning unknown error.
- Subject: Re: system command returning unknown error.
- From: John Francini <email@hidden>
- Date: Wed, 14 Jun 2006 15:09:38 -0400
Rather than having people say "Yes, I did, No, I didn't", let's cut
the Gordian knot.
The man page on 10.4.6 reads as follows:
SYSTEM(3) BSD Library Functions Manual
SYSTEM(3)
NAME
system -- pass a command to the shell
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <stdlib.h>
int
system(const char *string);
DESCRIPTION
The system() function hands the argument string to the command
inter-
preter sh(1). The calling process waits for the shell to
finish execut-
ing the command, ignoring SIGINT and SIGQUIT, and blocking
SIGCHLD.
If string is a NULL pointer, system() will return non-zero if
the command
interpreter sh(1) is available, and zero if it is not.
The system() function returns the exit status of the shell as
returned by
waitpid(2), or -1 if an error occurred when invoking fork(2) or
waitpid(2). A return value of 127 means the execution of the
shell
failed.
SEE ALSO
sh(1), execve(2), fork(2), waitpid(2), popen(3)
STANDARDS
The system() function conforms to ISO/IEC 9899:1990 (``ISO
C90'') and is
expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.
BSD June 4,
1993 BSD
Given this, your error of 32256 is being generated by the shell --
meaning the command you ran exited with that status.
It might be more helpful if you can give a concise example of the
specific code that is failing.
John Francini
On 14 Jun 2006, at 14:12, Matthew Jaffa wrote:
Yes I read the man page, and it says -1 if not successful, 0 if
successful, and returns non-zero if the command you pass in is
NULL, but I know I didn't pass in null cause I log it right before
I execute the command.
Matt
From: "Justin C. Walker" <email@hidden>
To: "email@hidden list" <email@hidden>
Subject: Re: system command returning unknown error.
Date: Wed, 14 Jun 2006 10:38:46 -0700
On Jun 14, 2006, at 10:30 , matt jaffa wrote:
Hi,
I am calling system(char* command) in my .cpp file. But this is
returning
error 32256. This error no. is not documented so I don't know
why it is not
working.
Anyone seen this error number before and know what it means.
Did you read the man page for the 'system()' call?
Regards,
Justin
--
Justin C. Walker, Curmudgeon at Large
Director
Institute for the Enhancement of the Director's Income
-----------
Nobody knows the trouble I've been
-----------
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