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/* darkstat 3
* copyright (c) 2001-2011 Emil Mikulic.
*
* err.c: BSD-like err() and warn() functions
*
* Permission to use, copy, modify, and distribute this file for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "cdefs.h"
#include "err.h"
#include "opt.h"
#include "pidfile.h"
#include "bsd.h" /* for strlcpy */
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <unistd.h>
static void to_syslog(const char *type, const int want_err,
const char *format, va_list va) _printflike_(3, 0);
static void
to_syslog(const char *type, const int want_err,
const char *format, va_list va)
{
char buf[512];
size_t pos = 0;
int saved_errno = errno;
if (type != NULL) {
strlcpy(buf, type, sizeof(buf));
pos = strlen(buf);
}
vsnprintf(buf+pos, sizeof(buf)-pos, format, va);
if (want_err) {
strlcat(buf, ": ", sizeof(buf));
strlcat(buf, strerror(saved_errno), sizeof(buf));
}
syslog(LOG_DEBUG, "%s", buf);
}
void
err(const int code, const char *format, ...)
{
va_list va;
va_start(va, format);
if (opt_want_syslog)
to_syslog("ERROR: ", 1, format, va);
else {
fprintf(stderr, "%5d: error: ", (int)getpid());
vfprintf(stderr, format, va);
fprintf(stderr, ": %s\n", strerror(errno));
}
va_end(va);
pidfile_unlink();
exit(code);
}
void
errx(const int code, const char *format, ...)
{
va_list va;
va_start(va, format);
if (opt_want_syslog)
to_syslog("ERROR: ", 0, format, va);
else {
fprintf(stderr, "%5d: error: ", (int)getpid());
vfprintf(stderr, format, va);
fprintf(stderr, "\n");
}
va_end(va);
pidfile_unlink();
exit(code);
}
void
warn(const char *format, ...)
{
va_list va;
va_start(va, format);
if (opt_want_syslog)
to_syslog("WARNING: ", 1, format, va);
else {
fprintf(stderr, "%5d: warning: ", (int)getpid());
vfprintf(stderr, format, va);
fprintf(stderr, ": %s\n", strerror(errno));
}
va_end(va);
}
void
warnx(const char *format, ...)
{
va_list va;
va_start(va, format);
if (opt_want_syslog)
to_syslog("WARNING: ", 0, format, va);
else {
fprintf(stderr, "%5d: warning: ", (int)getpid());
vfprintf(stderr, format, va);
fprintf(stderr, "\n");
}
va_end(va);
}
/* We interlock verbosef() between processes by using a pipe with a single
* byte in it. This pipe must be initialized before the first fork() in order
* to work. Then, verbosef() will block on a read() until it is able to
* retrieve the byte. After doing its business, it will put a byte back into
* the pipe.
*
* This is completely silly and largely unnecessary.
*/
static int inited = 0;
static int lockpipe[2];
static void unlock(void);
static void
initlock(void)
{
if (pipe(lockpipe) == -1)
err(1, "pipe(lockpipe)");
inited = 1;
unlock();
}
static void
lock(void)
{
char buf[1];
if (!inited) initlock();
if (read(lockpipe[0], buf, 1) != 1) {
fprintf(stderr, "lock failed!\n");
pidfile_unlink();
exit(1);
}
}
static void
unlock(void)
{
char c = 0;
if (write(lockpipe[1], &c, 1) != 1) {
fprintf(stderr, "unlock failed!\n");
pidfile_unlink();
exit(1);
}
}
void
verbosef(const char *format, ...)
{
va_list va;
if (!opt_want_verbose) return;
va_start(va, format);
if (opt_want_syslog)
to_syslog(NULL, 0, format, va);
else {
lock();
fprintf(stderr, "darkstat (%05d): ", (int)getpid());
vfprintf(stderr, format, va);
fprintf(stderr, "\n");
unlock();
}
va_end(va);
}
void
dverbosef(const char *format _unused_, ...)
{
/* disabled / do-nothing verbosef */
}
/* vim:set ts=3 sw=3 tw=78 expandtab: */
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