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Clean up some of the pts(4) vs pty(4) stuff in grantpt(3) and friends:

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- Use PTY* for all pty(4) related constants.
- Use PTMX* for all pts(4) related constants.
- Consistently use _PATH_DEV PTMX rather than "/dev/ptmx".
- Revert 1.7 and properly fix it by using the correct prefix string for
  pts(4) masters.

MFC after:	3 days
This commit is contained in:
John Baldwin 2007-12-21 21:26:08 +00:00
parent f29fe35ae8
commit d32324f64f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=174842
1 changed files with 23 additions and 22 deletions
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45
lib/libc/stdlib/grantpt.c
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@ -56,18 +56,19 @@ __FBSDID("$FreeBSD$");
#include <unistd.h>
#include "un-namespace.h"
#define PTM_PREFIX "pty" /* pseudo tty master naming convention */
#define PTS_PREFIX "tty" /* pseudo tty slave naming convention */
#define NEWPTS_PREFIX "pts"
#define PTYM_PREFIX "pty" /* pty(4) master naming convention */
#define PTYS_PREFIX "tty" /* pty(4) slave naming convention */
#define PTMXM_PREFIX "ptc/" /* pts(4) master naming convention */
#define PTMXS_PREFIX "pts/" /* pts(4) slave naming convention */
#define PTMX "ptmx"
/*
* The following are range values for pseudo TTY devices. Pseudo TTYs have a
* name of /dev/[pt]ty[l-sL-S][0-9a-v], yielding 256 combinations per major.
*/
#define PT_MAX 256
#define PT_DEV1 "pqrsPQRSlmnoLMNO"
#define PT_DEV2 "0123456789abcdefghijklmnopqrstuv"
#define PTY_MAX 256
#define PTY_DEV1 "pqrsPQRSlmnoLMNO"
#define PTY_DEV2 "0123456789abcdefghijklmnopqrstuv"
/*
* grantpt(3) support utility.
@ -80,7 +81,7 @@ __FBSDID("$FreeBSD$");
*/
#define ISPTM(x) (S_ISCHR((x).st_mode) && \
minor((x).st_rdev) >= 0 && \
minor((x).st_rdev) < PT_MAX)
minor((x).st_rdev) < PTY_MAX)
static int
@ -103,7 +104,7 @@ __use_pts(void)
if (error) {
struct stat sb;
if (stat("/dev/ptmx", &sb) != 0)
if (stat(_PATH_DEV PTMX, &sb) != 0)
return (0);
use_pts = 1;
}
@ -197,7 +198,7 @@ grantpt(int fildes)
int
posix_openpt(int oflag)
{
char *mc1, *mc2, master[] = _PATH_DEV PTM_PREFIX "XY";
char *mc1, *mc2, master[] = _PATH_DEV PTYM_PREFIX "XY";
const char *pc1, *pc2;
int fildes, bflag, serrno;
@ -216,12 +217,12 @@ posix_openpt(int oflag)
fildes = _open(_PATH_DEV PTMX, oflag);
return (fildes);
}
mc1 = master + strlen(_PATH_DEV PTM_PREFIX);
mc1 = master + strlen(_PATH_DEV PTYM_PREFIX);
mc2 = mc1 + 1;
/* Cycle through all possible master PTY devices. */
for (pc1 = PT_DEV1; !bflag && (*mc1 = *pc1); ++pc1)
for (pc2 = PT_DEV2; (*mc2 = *pc2) != '\0'; ++pc2) {
for (pc1 = PTY_DEV1; !bflag && (*mc1 = *pc1); ++pc1)
for (pc2 = PTY_DEV2; (*mc2 = *pc2) != '\0'; ++pc2) {
/*
* Break out if we successfully open a PTY,
* or if open() fails due to limits.
@ -249,8 +250,8 @@ posix_openpt(int oflag)
char *
ptsname(int fildes)
{
static char slave[] = _PATH_DEV PTS_PREFIX "XY";
static char new_slave[] = _PATH_DEV NEWPTS_PREFIX "4294967295";
static char pty_slave[] = _PATH_DEV PTYS_PREFIX "XY";
static char ptmx_slave[] = _PATH_DEV PTMXS_PREFIX "4294967295";
char *retval;
struct stat sbuf;
@ -261,17 +262,17 @@ ptsname(int fildes)
errno = EINVAL;
else {
if (!is_pts(fildes)) {
(void)snprintf(slave, sizeof(slave),
_PATH_DEV PTS_PREFIX "%s",
(void)snprintf(pty_slave, sizeof(pty_slave),
_PATH_DEV PTYS_PREFIX "%s",
devname(sbuf.st_rdev, S_IFCHR) +
strlen(PTM_PREFIX));
retval = slave;
strlen(PTYM_PREFIX));
retval = pty_slave;
} else {
(void)snprintf(new_slave, sizeof(new_slave),
_PATH_DEV NEWPTS_PREFIX "%s",
(void)snprintf(ptmx_slave, sizeof(ptmx_slave),
_PATH_DEV PTMXS_PREFIX "%s",
devname(sbuf.st_rdev, S_IFCHR) +
strlen(PTM_PREFIX));
retval = new_slave;
strlen(PTMXM_PREFIX));
retval = ptmx_slave;
}
}
}