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On Sunday 26 January 2003 10:24 pm, David Kramer wrote:
> On Sunday 26 January 2003 01:12 pm, exits funnel wrote:
[snip]
> > When I compile this and run it from bash I see "Return
> > Value: 256" at stdout as I'd expect. However, I then
> > immediately 'echo $?' and bash spits back '0' rather
> > than '256.' Is this correct? Shouldn't $? hold the
> > return value of the last program run from bash (ie, my
> > c program?) Thanks in advance for any replies.
>
> Your problem is that you need to call exit() and not return() from
> main() to set the exit value.
Either appears to work, the problem is that the return code is too large.
The same results occur with both exit() and return()
$ cat return.cpp
#include <iostream>
int main( )
{
int return_value = system("ls -l /fff");
std::cout << "\n Return Value: " << return_value << "\n";
exit return_value;
}
Results in:
$ ./return1
ls: /fff: No such file or directory
Return Value: 256
[mfratoni@paradox mfratoni]$ echo $?
0
While reducing the exit value works:
#include <iostream>
int main( )
{
int return_value = system("ls -l /fff");
std::cout << "\n Return Value: " << return_value << "\n";
exit (return_value - 1);
}
$ ./return1
ls: /fff: No such file or directory
Return Value: 256
[mfratoni@paradox mfratoni]$ echo $?
255
- --
- -Michael
pgp key: http://www.tuxfan.homeip.net:8080/gpgkey.txt
Red Hat Linux 7.{2,3}|8.0 in 8M of RAM: http://www.rule-project.org/
- --
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