NAME
elf_errmsg, elf_errno — error handling
SYNOPSIS
cc
[flag... ]
file...
-lelf
[library] ...
#include <libelf.h>
const char *elf_errmsg(int err);
int elf_errno(void);
DESCRIPTION
If an ELF library function fails, a program may call
elf_errno
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.
elf_errmsg
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,
elf_errmsg
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
elf_errno,
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 */
}
}
Printable version
