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Интерактивная система просмотра системных руководств (man-ов)

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vwarn (3)
  • >> vwarn (3) ( FreeBSD man: Библиотечные вызовы )
  • vwarn (3) ( Русские man: Библиотечные вызовы )
  • vwarn (3) ( Linux man: Библиотечные вызовы )

  • BSD mandoc
     

    NAME

    
    
    err
    
     
    verr
    
     
    errc
    
     
    verrc
    
     
    errx
    
     
    verrx
    
     
    warn
    
     
    vwarn
    
     
    warnc
    
     
    vwarnc
    
     
    warnx
    
     
    vwarnx
    
     
    err_set_exit
    
     
    err_set_file
    
     - formatted error messages
    
     
    

    LIBRARY

    Lb libc
    
     
    

    SYNOPSIS

       #include <err.h>
    void err (int eval const char *fmt ...);
    void err_set_exit (void (*exitf)(int));
    void err_set_file (void *vfp);
    void errc (int eval int code const char *fmt ...);
    void errx (int eval const char *fmt ...);
    void warn (const char *fmt ...);
    void warnc (int code const char *fmt ...);
    void warnx (const char *fmt ...);
       #include <stdarg.h>
    void verr (int eval const char *fmt va_list args);
    void verrc (int eval int code const char *fmt va_list args);
    void verrx (int eval const char *fmt va_list args);
    void vwarn (const char *fmt va_list args);
    void vwarnc (int code const char *fmt va_list args);
    void vwarnx (const char *fmt va_list args);
     

    DESCRIPTION

    The err ();
    and warn ();
    family of functions display a formatted error message on the standard error output, or on another file specified using the err_set_file ();
    function. In all cases, the last component of the program name, a colon character, and a space are output. If the Fa fmt argument is not NULL, the printf(3) -like formatted error message is output. The output is terminated by a newline character.

    The err (,);
    errc (,);
    verr (,);
    verrc (,);
    warn (,);
    warnc (,);
    vwarn (,);
    and vwarnc ();
    functions append an error message obtained from strerror(3) based on a supplied error code value or the global variable errno preceded by another colon and space unless the Fa fmt argument is NULL

    In the case of the errc (,);
    verrc (,);
    warnc (,);
    and vwarnc ();
    functions, the Fa code argument is used to look up the error message.

    The err (,);
    verr (,);
    warn (,);
    and vwarn ();
    functions use the global variable errno to look up the error message.

    The errx ();
    and warnx ();
    functions do not append an error message.

    The err (,);
    verr (,);
    errc (,);
    verrc (,);
    errx (,);
    and verrx ();
    functions do not return, but exit with the value of the argument Fa eval . It is recommended that the standard values defined in sysexits(3) be used for the value of Fa eval . The err_set_exit ();
    function can be used to specify a function which is called before exit(3) to perform any necessary cleanup; passing a null function pointer for exitf resets the hook to do nothing. The err_set_file ();
    function sets the output stream used by the other functions. Its Fa vfp argument must be either a pointer to an open stream (possibly already converted to void *) or a null pointer (in which case the output stream is set to standard error).  

    EXAMPLES

    Display the current errno information string and exit:
    if ((p = malloc(size)) == NULL)
            err(1, NULL);
    if ((fd = open(file_name, O_RDONLY, 0)) == -1)
            err(1, "%s", file_name);
    

    Display an error message and exit:

    if (tm.tm_hour < START_TIME)
            errx(1, "too early, wait until %s", start_time_string);
    

    Warn of an error:

    if ((fd = open(raw_device, O_RDONLY, 0)) == -1)
            warnx("%s: %s: trying the block device",
                raw_device, strerror(errno));
    if ((fd = open(block_device, O_RDONLY, 0)) == -1)
            err(1, "%s", block_device);
    

    Warn of an error without using the global variable errno

    error = my_function();  /* returns a value from <errno.h> */
    if (error != 0)
            warnc(error, "my_function");
    
     

    SEE ALSO

    exit(3), fmtmsg(3), printf(3), strerror(3), sysexits(3)  

    HISTORY

    The err ();
    and warn ();
    functions first appeared in BSD 4.4 The err_set_exit ();
    and err_set_file ();
    functions first appeared in Fx 2.1 . The errc ();
    and warnc ();
    functions first appeared in Fx 3.0 .


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    EXAMPLES
    SEE ALSO
    HISTORY


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