d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

ptsname() bits for pts.

Browse Source
This commit is contained in:
Olivier Houchard 2006-01-26 01:33:55 +00:00
parent db256336b8
commit 67c7201e18
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=154836
1 changed files with 45 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
lib/libc/stdlib/grantpt.c
View File

@ -41,6 +41,8 @@ __FBSDID("$FreeBSD$");
#include <sys/wait.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/sysctl.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <fcntl.h>
@ -56,6 +58,8 @@ __FBSDID("$FreeBSD$");
#define PTM_PREFIX "pty" /* pseudo tty master naming convention */
#define PTS_PREFIX "tty" /* pseudo tty slave naming convention */
#define NEWPTS_PREFIX "pts/"
#define PTMX "ptmx"
/*
* The following are range values for pseudo TTY devices. Pseudo TTYs have a
@ -78,6 +82,29 @@ __FBSDID("$FreeBSD$");
minor((x).st_rdev) >= 0 && \
minor((x).st_rdev) < PT_MAX)
static int
is_pts(int fd)
{
int nb;
return (_ioctl(fd, TIOCGPTN, &nb) == 0);
}
int
__use_pts(void)
{
int use_pts;
size_t len;
int error;
len = sizeof(use_pts);
error = sysctlbyname("kern.pts.enable", &use_pts, &len, NULL, 0);
if (error)
return (0);
return (use_pts);
}
/*
* grantpt(): grant ownership of a slave pseudo-terminal device to the
* current user.
@ -180,6 +207,10 @@ posix_openpt(int oflag)
if (oflag & ~(O_RDWR | O_NOCTTY))
errno = EINVAL;
else {
if (__use_pts()) {
fildes = _open(_PATH_DEV PTMX, oflag);
return (fildes);
}
mc1 = master + strlen(_PATH_DEV PTM_PREFIX);
mc2 = mc1 + 1;
@ -214,6 +245,7 @@ char *
ptsname(int fildes)
{
static char slave[] = _PATH_DEV PTS_PREFIX "XY";
static char new_slave[] = _PATH_DEV NEWPTS_PREFIX "4294967295";
char *retval;
struct stat sbuf;
@ -223,11 +255,19 @@ ptsname(int fildes)
if (!ISPTM(sbuf))
errno = EINVAL;
else {
(void)snprintf(slave, sizeof(slave),
_PATH_DEV PTS_PREFIX "%s",
devname(sbuf.st_rdev, S_IFCHR) +
strlen(PTM_PREFIX));
retval = slave;
if (!is_pts(fildes)) {
(void)snprintf(slave, sizeof(slave),
_PATH_DEV PTS_PREFIX "%s",
devname(sbuf.st_rdev, S_IFCHR) +
strlen(PTM_PREFIX));
retval = slave;
} else {
(void)snprintf(new_slave, sizeof(new_slave),
_PATH_DEV NEWPTS_PREFIX "%s",
devname(sbuf.st_rdev, S_IFCHR) +
strlen(PTM_PREFIX));
retval = new_slave;
}
}
}