#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h> /* ANSI C header file */
#include <syslog.h> /* for syslog() */ #define MAXLINE 4096 int daemon_proc; /* set nonzero by daemon_init() */ static void err_doit(int, int, const char *, va_list); /* Nonfatal error related to system call
* Print message and return */ void err_ret(const char *fmt, ...) { va_list ap; va_start(ap, fmt);
err_doit(, LOG_INFO, fmt, ap);
va_end(ap);
return;
} /* Fatal error related to system call
* Print message and terminate */ void err_sys(const char *fmt, ...) { va_list ap; va_start(ap, fmt);
err_doit(, LOG_ERR, fmt, ap);
va_end(ap);
exit();
} /* Fatal error related to system call
* Print message, dump core, and terminate */ void err_dump(const char *fmt, ...) {
va_list ap; va_start(ap, fmt);
err_doit(, LOG_ERR, fmt, ap);
va_end(ap);
abort(); /* dump core and terminate */
exit(); /* shouldn't get here */
} /* Nonfatal error unrelated to system call
* Print message and return */ void err_msg(const char *fmt, ...) { va_list ap; va_start(ap, fmt);
err_doit(, LOG_INFO, fmt, ap);
va_end(ap);
return;
} /* Fatal error unrelated to system call
* Print message and terminate */ void err_quit(const char *fmt, ...) { va_list ap; va_start(ap, fmt);
err_doit(, LOG_ERR, fmt, ap);
va_end(ap);
exit();
} /* Print message and return to caller
* Caller specifies "errnoflag" and "level" */ static void err_doit(int errnoflag, int level, const char *fmt, va_list ap) { int errno_save, n;
char buf[MAXLINE + ]; errno_save = errno; /* value caller might want printed */
#ifdef HAVE_VSNPRINTF
vsnprintf(buf, MAXLINE, fmt, ap); /* safe */
#else
vsprintf(buf, fmt, ap); /* not safe */
#endif
n = strlen(buf);
if (errnoflag)
snprintf(buf + n, MAXLINE - n, ": %s", strerror(errno_save));
strcat(buf, "\n"); if (daemon_proc) {
syslog(level, buf);
} else {
fflush(stdout); /* in case stdout and stderr are the same */
fputs(buf, stderr);
fflush(stderr);
}
return;
}