02-16-2009
thanks for your answer, Corona688. yes, this is a way.
are the any other ways if I am not convenient (i.e. have no chance) to make a copy of stderr with dup() before the redirection happens?
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LEARN ABOUT HPUX
elf_errno
elf_error(3E) elf_error(3E)
NAME
elf_errmsg, elf_errno - error handling
SYNOPSIS
[flag... ] file... [library] ...
DESCRIPTION
If an ELF library function fails, a program may call to retrieve the library's internal error number. As a side effect, this function
resets the internal error number to zero, which indicates no error.
takes an error number, err, and returns a null-terminated error message (with no trailing new-line) that describes the problem. A zero err
retrieves a message for the most recent error. If no error has occurred, the return value is a null pointer (not a pointer to the null
string). Using err of -1 also retrieves the most recent error, except it guarantees a non-null return value, even when no error has
occurred. If no message is available for the given number, returns a pointer to an appropriate message. This function does not have the
side effect of clearing the internal error number.
EXAMPLES
The following fragment clears the internal error number and checks it later for errors. Unless an error occurs after the first call to the
next call will return zero.
(void)elf_errno();
while (more_to_do)
{
/* processing ... */
if ((err = elf_errno()) != 0)
{
msg = elf_errmsg(err);
/* print msg */
}
}
SEE ALSO
elf(3E), elf_version(3E).
elf_error(3E)