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Invoke revoke(2) on the slave pty in the pts(4) case (new_openpty()) to

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kick off any other users on the device line before using it since
openpty(3) is documented to do this.  Note that grantpt(3) does not
call revoke(2), it only adjusts permissions and ownership.

MFC after:	3 days
This commit is contained in:
jhb 2007-12-20 21:10:06 +00:00
parent b72597c775
commit 03594bb79f
1 changed files with 13 additions and 1 deletions
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14
lib/libutil/pty.c
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@ -55,6 +55,7 @@ static int
new_openpty(int *amaster, int *aslave, char *name, struct termios *termp,
struct winsize *winp)
{
const char *slavename;
int master, slave;
master = posix_openpt(O_RDWR);
@ -66,7 +67,18 @@ new_openpty(int *amaster, int *aslave, char *name, struct termios *termp,
return (-1);
}
slave = open(ptsname(master), O_RDWR);
slavename = ptsname(master);
if (slavename == NULL) {
close(master);
return (-1);
}
if (revoke(slavename) == -1) {
close(master);
return (-1);
}
slave = open(slavename, O_RDWR);
if (slave == -1) {
close(master);
return (-1);