elf_error(3E)                    DG/UX 5.4.2                   elf_error(3E)


NAME
       elferrmsg, elferrno - error handling

SYNOPSIS
       cc [flag ...] file ...  -lelf [library ...]

       #include <libelf.h>
       const char *elferrmsg(int err);
       int elferrno(void);

DESCRIPTION
       If an ELF library function fails, a program may call elferrno 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.

       elferrmsg 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,
       elferrmsg returns a pointer to an appropriate message.  This
       function does not have the side effect of clearing the internal error
       number.

EXAMPLE
       The following fragment clears the internal error number and checks it
       later for errors.  Unless an error occurs after the first call to
       elferrno, the next call will return zero.

            (void)elferrno();
            while (moretodo)
            {
                    /* processing ... */
                    if ((err = elferrno()) != 0)
                    {
                            msg = elferrmsg(err);
                            /* print msg */
                    }
            }

SEE ALSO
       elf(3E), elfversion(3E).












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