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/* Copyright (C) 2001 Red Hat, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License
as published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this software; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#ifndef _BAUDBOY_H_
#define _BAUDBOY_H_
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#ifdef __cplusplus
extern "C" {
#endif
#define LOCKDEV_PATH "/usr/sbin/lockdev"
static inline int _doit(const char * argv[])
{
pid_t child;
int status;
void (*osig) (int) = signal(SIGCHLD, SIG_DFL);
int rc;
if (!(child = fork())) {
int fd;
/* these have to be open to something */
if ((fd = open("/dev/null", 2)) < 0)
exit(-1);
dup2(fd, 0);
dup2(fd, 1);
dup2(fd, 2);
close(fd);
/* Swap egid and gid for lockdev's access(2) device check. */
setregid(getegid(), getgid());
execv(argv[0], (char *const *)argv);
exit(-1);
}
rc = (int) waitpid(child, &status, 0);
signal(SIGCHLD, osig);
if (rc == child && WIFEXITED(status)) {
/*
* Exit dev_lock dev_unlock dev_testlock
* 0 OK OK not locked
* 1 locked other locked other locked
* 2 EACCES
* 3 EROFS
* 4 EFAULT
* 5 EINVAL
* 6 ENAMETOOLONG
* 7 ENOENT
* 8 ENOTDIR
* 9 ENOMEM
* 10 ELOOP
* 11 EIO
* 255 error error error
*/
rc = WEXITSTATUS(status);
switch(rc) {
case 0: rc = 0; break;
default:
case 1: rc = -EPERM; break;
case 2: rc = -EACCES; break;
case 3: rc = -EROFS; break;
case 4: rc = -EFAULT; break;
case 5: rc = -EINVAL; break;
case 6: rc = -ENAMETOOLONG; break;
case 7: rc = -ENOENT; break;
case 8: rc = -ENOTDIR; break;
case 9: rc = -ENOMEM; break;
case 10: rc = -ELOOP; break;
case 11: rc = -EIO; break;
}
} else if (rc == -1)
rc = -errno;
else
rc = -ECHILD;
return rc;
}
static inline int ttylock(const char * devname)
{
const char * argv[] = { LOCKDEV_PATH, "-l", NULL, NULL};
argv[2] = devname;
return _doit(argv);
}
static inline int ttyunlock(const char * devname)
{
const char * argv[] = { LOCKDEV_PATH, "-u", NULL, NULL};
argv[2] = devname;
return _doit(argv);
}
static inline int ttylocked(const char * devname)
{
const char * argv[] = { LOCKDEV_PATH, NULL, NULL};
argv[1] = devname;
return _doit(argv);
}
static inline int ttywait(const char * devname)
{
int rc;
while((rc = ttylocked(devname)) == 0)
sleep(1);
return rc;
}
#ifdef __cplusplus
};
#endif
#endif /* _BAUDBOY_H_ */
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