Hi all. We are developing and application over uclibc and busybox on a
mips architecture.
In addition, we are using an Erlang Virtual Machine. The problem is that
this one fails when we try to access to system. Example:
4> os:cmd("ls /").
[]
5> open_port({spawn, "ls"}, []).
#Port<0.91>
6> flush().
ok
As we see, the above commands doesn't list anything.
We think underlaying Virtual Machine uses "exec" family calls and these
ones crash. In fact, we have made some tests with little programs. We
compile the same source code to x86 and mips and then, we saw different
behaviors.
The above results have led us to anticipate that glibc is robuster than
uclibc and supports some warnings. In such a case we can think that
Erlang VM. Have anybody an idea about this?
Thanks,
Andrés Estévez
int main(){
int result = execv("/bin/ls", NULL);
exit(0);
}//main
mips: Segmentation fault
x86: OK
*************************************************************************************
int main(){
int result = execv("/bin/ls", "-lisa");
exit(0);
}//main
warning
proba_exec5.c:13: warning: passing argument 2 of ‘execv’ from
incompatible pointer type
mips: error 14, Bad address
x86: error 14, Bad address
*************************************************************************************
int main(){
int result = execv("/bin/ls", "");
exit(0);
}//main
warning
proba_exec9.c:13: warning: passing argument 2 of ‘execv’ from
incompatible pointer type
mips: Segmentation fault
x86: Error, error 14, Bad address
***************************************************************************************
int main(){
char *cmd[] = { "ls", "-l", (char *)0 };
int result = execv("/bin/ls", cmd);
exit(0);
}//main
mips: Ok
x86: Ok
**************************************************************************************
int main(){
char *cmd[] = { "ls", "", (char *)0 };
int result = execv("/bin/ls", cmd);
exit(0);
}//main
mips: No such file or directory
x86: no such file or directory
****************************************************************************************
int main(){
char *cmd[] = { "ls", NULL, (char *)0 };
int result = execv("/bin/ls", cmd);
exit(0);
}//main
mips: Ok
x86: Ok
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