Ignore:
Timestamp:
Jul 2, 2008, 4:35:26 PM (10 years ago)
Author:
Sam Hocevar
Message:
  • Fork the grabbed process and exit the parent. Unfortunately for some reason it still survives as a zombie, there must be something wrong with the setsid/setpgid mechanism we use (maybe setpgrp is needed?).
File:
1 edited

Legend:

Unmodified
Added
Removed

  • neercs/trunk/src/grab.c

    r2512 r2516  
    3939#if defined HAVE_LINUX_KDEV_T_H
    4040    char fdstr[1024];
    41     struct mytrace *t;
     41    struct mytrace *parent, *child;
    4242    int i, fd = 0, mode, ret;
    4343    char to_open[3];
    … …  
    4646    debug("pty is %s", ptyname);
    4747
    48     t = mytrace_attach(pid);
    49     if(!t)
     48    parent = mytrace_attach(pid);
     49    if(!parent)
    5050    {
    5151        fprintf(stderr, "Cannot access process %ld\n", pid);
    5252        return -1;
    5353    }
     54
     55    child = mytrace_fork(parent);
     56    pid = mytrace_getpid(child);
    5457
    5558    /* Look for file descriptors that are PTYs */
    … …  
    7578        debug("found pty %d", i);
    7679
    77         ret = mytrace_close(t, i);
     80        if(i == 2)
     81        {
     82            mytrace_write(parent, i, "\x1b]0;\x07", 5);
     83            mytrace_write(parent, i, "\x1b[1000l", 7);
     84            mytrace_write(parent, i, "\x1b[?12l\x1b[?25h", 12);
     85            mytrace_write(parent, i, "\n[Process stolen by neercs]\n", 28);
     86        }
     87
     88        ret = mytrace_close(child, i);
    7889        if(ret < 0)
    7990        {
    … …  
    8697    debug("Running setsid on process %ld (sid=%d)", pid, getsid(pid));
    8798
    88     ret = mytrace_setpgid(t, 0, getsid(pid));
     99    ret = mytrace_setpgid(child, 0, getsid(pid));
    89100    if(ret < 0)
    90101    {
    91102        fprintf(stderr, "syscall setpgid failed\n");
    92         mytrace_detach(t);
     103        mytrace_detach(child);
    93104        return -1;
    94105    }
    … …  
    97108    {
    98109        fprintf(stderr, "setpgid returned %d\n", ret);
    99         mytrace_detach(t);
     110        mytrace_detach(child);
    100111        return -1;
    101112    }
    102113
    103     ret = mytrace_setsid(t);
     114    ret = mytrace_setsid(child);
    104115    if(ret < 0)
    105116    {
    106117        fprintf(stderr, "syscall setsid failed\n");
    107         mytrace_detach(t);
     118        mytrace_detach(child);
    108119        return -1;
    109120    }
    110121
    111122    debug("pid %ld has now sid %d", pid, getsid(pid));
     123
     124    mytrace_exit(parent, 0);
     125    mytrace_detach(parent);
    112126
    113127    /* Reopen PTY file descriptors */
    … …  
    116130        if(!to_open[i])
    117131            continue;
    118         fd = mytrace_open(t, ptyname, mode);
     132        fd = mytrace_open(child, ptyname, mode);
    119133        if(fd < 0)
    120134        {
    121135            perror("mytrace_open");
    122136        }
    123         ret = mytrace_dup2(t, fd, i);
     137        ret = mytrace_dup2(child, fd, i);
    124138        if(ret < 0)
    125139        {
    … …  
    129143
    130144    kill(pid, SIGWINCH);
    131 
    132     mytrace_detach(t);
     145    mytrace_detach(child);
    133146
    134147    return 0;
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