Problems with psinfo

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Problems with psinfo_t and tty

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Problems with psinfo_t and tty - Apr. 6, '06, 11:07:21 AM

BBR

Posts: 4
Joined: Jan. 5, '06,
Status: offline

I have following problem:

Having the name of the TTY (/dev/ttyp0 for example) i need to get all processes attached to it. My steps:

1. Get TTY's descriptor:
struct stat st;
...
if (stat(ttyName, &st) >= 0 && (st.st_mode & S_IFMT) == S_IFCHR))
tty = st.st_rdev;

2. Check processes:
dirfp = opendir("/proc");
...
sprintf(name, "/proc/%s/psinfo", dp->d_name);
fd = open(name, O_RDONLY);
...
static psinfo_t pi;
read(fd, &pi, sizeof(pi));
if (pi.pr_ttydev == tty) ...

And this isn't work.
For example, stat /dev/ttyp0 shows:
...
dev: 1073741891
...

cat /proc/1157/stat
...
tty ttyp0
...

But in my code pi.pr_ttydev for PID 1157 is 96. Why ?

_____________________________

Boris B. Rudakov

Post #: 1

RE: Problems with psinfo_t and tty - Apr. 6, '06, 2:31:14 PM

Rodney

Posts: 3714
Joined: Jul. 9, '02,
From: /Tools lab
Status: offline

Because it's terminal 96 of all terminals (glass + serial + slave pty).

(in reply to BBR)

Post #: 2

RE: Problems with psinfo_t and tty - Apr. 6, '06, 3:08:01 PM

BBR

Posts: 4
Joined: Jan. 5, '06,
Status: offline

quote:

ORIGINAL: Rodney

Because it's terminal 96 of all terminals (glass + serial + slave pty).

But why ?

Code above works fine on most unixes (look 'skill' tool code for example).

How ps gets terminal names ?

_____________________________

Boris B. Rudakov

(in reply to Rodney)