ELF_ERRMSG(3)						   BSD Library Functions Manual 					     ELF_ERRMSG(3)

NAME

     elf_errmsg, elf_errno -- ELF library error message handling

LIBRARY

     ELF Access Library (libelf, -lelf)

SYNOPSIS

     #include <libelf.h>

     int
     elf_errno(void);

     const char *
     elf_errmsg(int error);

DESCRIPTION

     When an error occurs during an ELF library API call, the library encodes the error using an error number and stores the error number inter-
     nally for retrieval by the application at a later point of time.  Error numbers may contain an OS supplied error code in addition to an ELF
     API specific error code.  An error number value of zero indicates no error.

     Function elf_errno() is used to retrieve the last error recorded by the ELF library.  Invoking this function has the side-effect of resetting
     the ELF library's recorded error number to zero.

     The function elf_errmsg() returns a null-terminated string with a human readable description of the error specified in argument error.  A
     zero value for argument error retrieves the most recent error encountered by the ELF library.  An argument value of -1 behaves identically,
     except that it guarantees a non-NULL return from elf_errmsg().

RETURN VALUES

     Function elf_errno() returns a non-zero value encoding the last error encountered by the ELF library, or zero if no error was encountered.

     Function elf_errmsg() returns a pointer to library local storage for non-zero values of argument error.  With a zero argument, the function
     will return a NULL pointer if no error had been encountered by the library, or will return a pointer to library local storage containing an
     appropriate message otherwise.

EXAMPLES

     Clearing the ELF library's recorded error number can be accomplished by invoking elf_errno() and discarding its return value.

	   /* clear error */
	   (void) elf_errno();

     Retrieving a human-readable description of the current error number can be done with the following snippet:

	   int err;
	   const char *errmsg;
	   ...
	   err = elf_errno();
	   if (err != 0)
		   errmsg = elf_errmsg(err);

SEE ALSO

     elf(3), gelf(3)

BUGS

     Function elf_errmsg() is not localized.

BSD
								   June 11, 2006							       BSD