1 /*

     2 

     3  module: errlib.c

     4 

     5  purpose: library of error functions

     6 

     7  reference: Stevens, Unix network programming (2ed), p.922

     8 

     9  */

    10 

    11 #include "errlib.h"

    12 

    13 

    14 #define MAXLINE 4095

    15 

    16 int daemon_proc = 0; /* set to 0 if stdout/stderr available, else set to 1 */

    17 

    18 static void err_doit (int errnoflag, int level, const char *fmt, va_list ap) {

    19     int errno_save = errno, n;

    20     char buf[MAXLINE+1];

    21 

    22     vsnprintf (buf, MAXLINE, fmt, ap);

    23     n = strlen(buf);

    24     if (errnoflag)

    25         snprintf (buf+n, MAXLINE-n, ": %s", strerror(errno_save));

    26     strcat (buf, "\n");

    27 

    28     if (daemon_proc)

    29         syslog (level, buf);

    30     else {

    31         fflush (stdout);

    32         fprintf (stderr, "%s", buf);

    33         fflush (stderr);

    34     }

    35 

    36     return;

    37 }

    38 

    39 void err_ret (const char *fmt, ...) {

    40     va_list ap;

    41 

    42     va_start (ap, fmt);

    43     err_doit (1, LOG_INFO, fmt, ap);

    44     va_end (ap);

    45     return;

    46 }

    47 

    48 void err_sys (const char *fmt, ...) {

    49     va_list ap;

    50 

    51     va_start (ap, fmt);

    52     err_doit (1, LOG_ERR, fmt, ap);

    53     va_end (ap);

    54     exit (1);

    55 }

    56 

    57 void err_msg (const char *fmt, ...) {

    58     va_list ap;

    59 

    60     va_start (ap, fmt);

    61     err_doit (0, LOG_INFO, fmt, ap);

    62     va_end (ap);

    63     return;

    64 }

    65 

    66 void err_quit (const char *fmt, ...) {

    67     va_list ap;

    68 

    69     va_start (ap, fmt);

    70     err_doit (0, LOG_ERR, fmt, ap);

    71     va_end (ap);

    72     exit (1);

    73 }

    74 

    75 void err_dump (const char *fmt, ...) {

    76     va_list ap;

    77 

    78     va_start (ap, fmt);

    79     err_doit (1, LOG_ERR, fmt, ap);

    80     va_end (ap);

    81     abort();

    82 }