Hi!
----
Below is a small reduced testcase (based on a larger application which
crashes the same way) which cases a crash in libshell code (current
codebase is ast-ksh.2009-05-05):
-- snip --
#include <shell.h>
int
main(int argc, char *argv[])
{
int i;
Shell_t *shp;
char *ar[2]={ "/usr/bin/sh", NULL };
shp = sh_init(1, ar, 0);
if (!shp)
error(ERROR_exit(1), "shell initialisation failed.");
(void) sh_trap("alias -v", 0);
return (0);
}
-- snip --
Output and stack trace look like this:
-- snip --
$ ./a.out
alias: -v: unknown option
Usage: alias [-ptx] [name[=value]...]
signal SEGV (no mapping at the fault address) in longjmp at 0xfefbe7a4
0xfefbe7a4: longjmp+0x0008: ldd [%o2], %l0
Current function is main
15 (void) sh_trap("alias -v", 0);
(dbx) where
[1] longjmp(0xff32f168, 0x6, 0x0, 0x3400, 0x0, 0xff2c5ed8), at
0xfefbe7a4
[2] sh_trap(0x0, 0x0, 0xff32c000, 0x6, 0x0, 0xff32eee4), at 0xff2b8d20
=>[3] main(argc = 1, argv = 0xffbffb6c), line 15 in "aliascrash.c
-- snip --
It seems "alias" hits an error and then tries a |longjmp()| which goes
wrong somehow...
... my guess is that my usage of |sh_trap()| is somehow wrong - do I
have do to anything extra to prevent this kind of crash ?
----
Bye,
Roland
--
__ . . __
(o.\ \/ /.o) [email protected]
\__\/\/__/ MPEG specialist, C&&JAVA&&Sun&&Unix programmer
/O /==\ O\ TEL +49 641 3992797
(;O/ \/ \O;)
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