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/* posix */
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/pty.h>
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#include "lib.h"
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#include "sys9.h"
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#include "dir.h"
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/*
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 * return the name of the slave
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 */
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char*
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ptsname(int fd)
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{
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	Dir *d;
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	static char buf[32];
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	if((d = _dirfstat(fd)) == nil || strlen(d->name) < 4){
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		free(d);
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		_syserrno();
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		return 0;
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	}
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	snprintf(buf, sizeof buf, "/dev/ptty%d", atoi(d->name+4));
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	free(d);
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	return buf;
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}
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/*
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 * return the name of the master
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 */
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char*
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ptmname(int fd)
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{
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	Dir *d;
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	static char buf[32];
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	if((d = _dirfstat(fd)) == nil || strlen(d->name) < 4){
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		free(d);
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		_syserrno();
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		return 0;
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	}
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	snprintf(buf, sizeof buf, "/dev/ttym%d", atoi(d->name+4));
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	return buf;
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}
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static char ptycl[] = "/dev/ptyclone";
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static char fssrv[] = "/srv/ptyfs";
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static void
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mkserver(void)
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{
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	int fd, i;
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	char *argv[3];
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	fd = _OPEN(fssrv, O_RDWR);
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	if(_MOUNT(fd, -1, "/dev", MAFTER, "") < 0) {
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		/*
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		 * remove fssrv here, if it exists, to avoid a race
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		 * between the loop in the default case below and the
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		 * new ptyfs removing fssrv when it starts.
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		 * we otherwise might be unlucky enough to open the old
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		 * (hung channel) fssrv before ptyfs removes it and break
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		 * out of the loop with an open fd to a hung channel?
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		 */
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		_CLOSE(fd);
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		_REMOVE(fssrv);
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		switch(_RFORK(RFPROC|RFFDG)) {
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		case -1:
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			return;
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		case 0:
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			argv[0] = "ptyfs";
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			argv[1] = 0;
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			_EXEC("/bin/ape/ptyfs", argv);
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			_EXITS(0);
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		default:
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			for(i = 0; i < 3; i++) {
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				fd = _OPEN(fssrv, O_RDWR);
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				if(fd >= 0)
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					break;
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				_SLEEP(1000);
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			}
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		}
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		if(fd < 0)
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			return;
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		if(_MOUNT(fd, -1, "/dev", MAFTER, "") < 0)
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			_CLOSE(fd);
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	}
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	/* successful _MOUNT closes fd */
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}
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/*
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 * allocate a new pty
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 */
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int
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_getpty(void)
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{
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	struct stat sb;
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	if(stat(ptycl, &sb) < 0)
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		mkserver();
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	return open(ptycl, O_RDWR);
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}