/* this may be a frequent stumbling point for new users, so be verbose here */
static void sock_fail(const char *fn)
{
int sockerr;
struct passwd *user;
/* save this so it doesn't get overwritten */
sockerr = errno;
/* dispense with the usual upslog stuff since we have stderr here */
printf("\nFatal error: unable to create listener socket\n\n");
printf("bind %s failed: %s\n", fn, strerror(sockerr));
user = getpwuid(getuid());
if (!user) {
fatal_with_errno(EXIT_FAILURE, "getpwuid");
}
/* deal with some common problems */
switch (errno)
{
case EACCES:
printf("\nCurrent user: %s (UID %d)\n\n",
user->pw_name, (int)user->pw_uid);
printf("Things to try:\n\n");
printf(" - set different owners or permissions on %s\n\n",
dflt_statepath());
printf(" - run this as some other user "
"(try -u <username>)\n");
break;
case ENOENT:
printf("\nThings to try:\n\n");
printf(" - mkdir %s\n", dflt_statepath());
break;
case ENOTDIR:
printf("\nThings to try:\n\n");
printf(" - rm %s\n\n", dflt_statepath());
printf(" - mkdir %s\n", dflt_statepath());
break;
}
/*
* there - that wasn't so bad. every helpful line of code here
* prevents one more "help me" mail to the list a year from now
*/
printf("\n");
fatalx(EXIT_FAILURE, "Exiting.");
}
/* Return the alternate path for pid files */
const char * altpidpath(void)
{
#ifdef ALTPIDPATH
return ALTPIDPATH;
#else
return dflt_statepath();
#endif
}
void dstate_init(const char *prog, const char *devname)
{
char sockname[SMALLBUF];
/* do this here for now */
signal(SIGPIPE, SIG_IGN);
if (devname) {
snprintf(sockname, sizeof(sockname), "%s/%s-%s", dflt_statepath(), prog, devname);
} else {
snprintf(sockname, sizeof(sockname), "%s/%s", dflt_statepath(), prog);
}
sockfd = sock_open(sockname);
upsdebugx(2, "dstate_init: sock %s open on fd %d", sockname, sockfd);
}
static int sstate_connect(void)
{
int ret, fd;
const char *dumpcmd = "DUMPALL\n";
struct sockaddr_un sa;
memset(&sa, '\0', sizeof(sa));
sa.sun_family = AF_UNIX;
snprintf(sa.sun_path, sizeof(sa.sun_path), "%s/%s", dflt_statepath(), device_path);
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd < 0) {
upslog_with_errno(LOG_ERR, "Can't create socket for UPS [%s]", device_path);
return -1;
}
ret = connect(fd, (struct sockaddr *) &sa, sizeof(sa));
if (ret < 0) {
time_t now;
close(fd);
/* rate-limit complaints - don't spam the syslog */
time(&now);
if (difftime(now, last_connfail) < 60) {
return -1;
}
last_connfail = now;
upslog_with_errno(LOG_ERR, "Can't connect to UPS [%s]", device_path);
return -1;
}
ret = fcntl(fd, F_GETFL, 0);
if (ret < 0) {
upslog_with_errno(LOG_ERR, "fcntl get on UPS [%s] failed", device_path);
close(fd);
return -1;
}
ret = fcntl(fd, F_SETFL, ret | O_NDELAY);
if (ret < 0) {
upslog_with_errno(LOG_ERR, "fcntl set O_NDELAY on UPS [%s] failed", device_path);
close(fd);
return -1;
}
/* get a dump started so we have a fresh set of data */
ret = write(fd, dumpcmd, strlen(dumpcmd));
if (ret != (int)strlen(dumpcmd)) {
upslog_with_errno(LOG_ERR, "Initial write to UPS [%s] failed", device_path);
close(fd);
return -1;
}
pconf_init(&sock_ctx, NULL);
time(&last_heard);
dumpdone = 0;
/* set ups.status to "WAIT" while waiting for the driver response to dumpcmd */
dstate_setinfo("ups.status", "WAIT");
upslogx(LOG_INFO, "Connected to UPS [%s]", device_path);
return fd;
}