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       come_err - Fonction générique d’affichage d’erreurs


        #include <et/com_err.h>
       void (*proc) (const char *, long, const char *, va_list);

       void com_err (const char *whoami, long code, const char *format, ...);

       proc = set_com_err_hook (proc);

       proc = reset_com_err_hook ();

       void initialize_XXXX_error_table ();


       Com_err  displays  an error message on the standard error stream stderr
       (see stdio(3S))  composed of the whoami string,  which  should  specify
       the  program name or some subportion of a program, followed by an error
       message generated from the code value (derived from compile_et(1)), and
       a  string produced using the format string and any following arguments,
       in the same style as fprintf(3).

       The behavior of com_err can be modified  using  set_com_err_hook;  this
       defines  a  procedure  which  is  called  with  the arguments passed to
       com_err, instead of the default  internal  procedure  which  sends  the
       formatted text to error output.  Thus the error messages from a program
       can all easily be diverted to another form of diagnostic logging,  such
       as  syslog(3).   Reset_com_err_hook may be used to restore the behavior
       of com_err to its default form.  Both procedures  return  the  previous
       “hook”  value.  These “hook” procedures must have the declaration given
       for proc above in the synopsis.

       The initialize_XXXX_error_table routine is  generated  mechanically  by
       compile_et(1)   from  a  source  file  containing  names and associated
       strings.  Each table has a name of up to four characters, which is used
       in place of the XXXX in the name of the routine.  These routines should
       be called before any of the corresponding error codes are used, so that
       the  com_err  library will recognize error codes from these tables when
       they are used.

       Le fichier  d’en-tête  com_err.h  devrait  être  inclu  dans  tous  les
       fichgiers source qui utilise des fonctions de la bibliothèque com_err ;
       l’édition  des   liens   des   fichiers   exécutables   doit   utiliser
       « -lcom_err » pour inclure la bibliothèque com_err.


       compile_et(1), syslog(3).

       Ken  Raeburn,  « A  Common  Error  Description  Library for UNIX » (une
       bibliothèque générique de description d’erreurs pour UNIX).


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