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add stuff to use /dev/ptmx etc.

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This commit is contained in:
Paul Mackerras 1999-06-24 00:17:02 +00:00
parent 971319042d
commit 2882779b0a
1 changed files with 42 additions and 17 deletions
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59
pppd/sys-linux.c
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@ -2117,7 +2117,7 @@ int cifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr)
/*
* get_pty - get a pty master/slave pair and chown the slave side
* to the uid given. Assumes slave_name points to >= 12 bytes of space.
* to the uid given. Assumes slave_name points to >= 16 bytes of space.
*/
int
get_pty(master_fdp, slave_fdp, slave_name, uid)
@ -2126,31 +2126,56 @@ get_pty(master_fdp, slave_fdp, slave_name, uid)
char *slave_name;
int uid;
{
int i, mfd, sfd;
char pty_name[12];
int i, mfd, sfd = -1;
char pty_name[16];
struct termios tios;
sfd = -1;
for (i = 0; i < 64; ++i) {
slprintf(pty_name, sizeof(pty_name), "/dev/pty%c%x",
'p' + i / 16, i % 16);
mfd = open(pty_name, O_RDWR, 0);
if (mfd >= 0) {
pty_name[5] = 't';
sfd = open(pty_name, O_RDWR | O_NOCTTY, 0);
if (sfd >= 0)
break;
close(mfd);
#ifdef TIOCGPTN
/*
* Try the unix98 way first.
*/
mfd = open("/dev/ptmx", O_RDWR);
if (mfd >= 0) {
int ptn;
if (ioctl(mfd, TIOCGPTN, &ptn) >= 0) {
slprintf(pty_name, sizeof(pty_name), "/dev/pts/%d", ptn);
chmod(pty_name, S_IRUSR | S_IWUSR);
#ifdef TIOCSPTLCK
ptn = 0;
if (ioctl(mfd, TIOCSPTLCK, &ptn) < 0)
warn("Couldn't unlock pty slave %s: %m", pty_name);
#endif
if ((sfd = open(pty_name, O_RDWR)) < 0)
warn("Couldn't open pty slave %s: %m", pty_name);
}
}
#endif /* TIOCGPTN */
if (sfd < 0) {
/* the old way - scan through the pty name space */
for (i = 0; i < 64; ++i) {
slprintf(pty_name, sizeof(pty_name), "/dev/pty%c%x",
'p' + i / 16, i % 16);
mfd = open(pty_name, O_RDWR, 0);
if (mfd >= 0) {
pty_name[5] = 't';
sfd = open(pty_name, O_RDWR | O_NOCTTY, 0);
if (sfd >= 0) {
fchown(sfd, uid, -1);
fchmod(sfd, S_IRUSR | S_IWUSR);
break;
}
close(mfd);
}
}
}
if (sfd < 0)
return 0;
strlcpy(slave_name, pty_name, 12);
strlcpy(slave_name, pty_name, 16);
*master_fdp = mfd;
*slave_fdp = sfd;
fchown(sfd, uid, -1);
fchmod(sfd, S_IRUSR | S_IWUSR);
if (tcgetattr(sfd, &tios) == 0) {
tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
tios.c_cflag |= CS8 | CREAD;