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elf_errmsg (3)
  • elf_errmsg (3) ( Solaris man: Библиотечные вызовы )
  • >> elf_errmsg (3) ( FreeBSD man: Библиотечные вызовы )

  • BSD mandoc
     

    NAME

    elf_errmsg
    
     
    elf_errno
    
     - ELF library error message handling
    
     
    

    LIBRARY

    Lb libelf
    
     
    

    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 internally 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.


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    EXAMPLES
    SEE ALSO
    BUGS


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