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753 lines
18 KiB
753 lines
18 KiB
/*
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* Copyright 2006-2007 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Reap any leftover children possibly holding file descriptors.
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* Children are identified by the stale file descriptor or PGID / SID.
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* Both can be missed but only the stale file descriptors are important for us.
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* PGID / SID may be set by the children on their own.
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* If we fine a candidate we kill it will all its process tree (grandchildren).
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* The child process is run with `2>&1' redirection (due to forkpty(3)).
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* 2007-07-10 Jan Kratochvil <jan.kratochvil@redhat.com>
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*/
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/* For getpgid(2). */
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#define _GNU_SOURCE 1
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <errno.h>
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#include <ctype.h>
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#include <string.h>
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#include <limits.h>
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#include <fcntl.h>
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#include <assert.h>
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#include <pty.h>
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#include <poll.h>
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#include <sys/stat.h>
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#define LENGTH(x) (sizeof (x) / sizeof (*(x)))
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static const char *progname;
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static volatile pid_t child;
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static void signal_chld (int signo)
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{
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}
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static volatile int signal_alrm_hit = 0;
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static void signal_alrm (int signo)
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{
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signal_alrm_hit = 1;
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}
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static char childptyname[LINE_MAX];
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static void print_child_error (const char *reason, char **argv)
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{
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char **sp;
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fprintf (stderr, "%s: %d %s:", progname, (int) child, reason);
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for (sp = argv; *sp != NULL; sp++)
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{
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fputc (' ', stderr);
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fputs (*sp, stderr);
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}
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fputc ('\n', stderr);
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}
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static int read_out (int amaster)
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{
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char buf[LINE_MAX];
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ssize_t buf_got;
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buf_got = read (amaster, buf, sizeof buf);
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if (buf_got == 0)
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return 0;
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/* Weird but at least after POLLHUP we get EIO instead of just EOF. */
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if (buf_got == -1 && errno == EIO)
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return 0;
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if (buf_got == -1 && errno == EAGAIN)
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return 0;
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if (buf_got < 0)
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{
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perror ("read (amaster)");
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exit (EXIT_FAILURE);
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}
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if (write (STDOUT_FILENO, buf, buf_got) != buf_got)
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{
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perror ("write(2)");
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exit (EXIT_FAILURE);
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}
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return 1;
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}
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/* kill (child, 0) == 0 sometimes even when CHILD's state is already "Z". */
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static int child_exited (void)
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{
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char buf[200];
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int fd, i, retval;
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ssize_t got;
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char state[3];
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snprintf (buf, sizeof (buf), "/proc/%ld/stat", (long) child);
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fd = open (buf, O_RDONLY);
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if (fd == -1)
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{
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perror ("open (/proc/CHILD/stat)");
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exit (EXIT_FAILURE);
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}
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got = read (fd, buf, sizeof(buf));
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if (got <= 0)
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{
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perror ("read (/proc/CHILD/stat)");
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exit (EXIT_FAILURE);
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}
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if (close (fd) != 0)
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{
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perror ("close (/proc/CHILD/stat)");
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exit (EXIT_FAILURE);
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}
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/* RHEL-5 does not support %ms. */
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i = sscanf (buf, "%*d%*s%2s", state);
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if (i != 1)
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{
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perror ("sscanf (/proc/CHILD/stat)");
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exit (EXIT_FAILURE);
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}
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retval = strcmp (state, "Z") == 0;
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return retval;
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}
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static int spawn (char **argv, int timeout)
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{
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pid_t child_got;
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int status, amaster, i, rc;
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struct sigaction act;
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sigset_t set;
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struct termios termios;
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unsigned alarm_orig;
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/* We do not use signal(2) to be sure we do not have SA_RESTART. */
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memset (&act, 0, sizeof (act));
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act.sa_handler = signal_chld;
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i = sigemptyset (&act.sa_mask);
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assert (i == 0);
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act.sa_flags = 0; /* !SA_RESTART */
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i = sigaction (SIGCHLD, &act, NULL);
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assert (i == 0);
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i = sigemptyset (&set);
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assert (i == 0);
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i = sigaddset (&set, SIGCHLD);
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assert (i == 0);
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i = sigprocmask (SIG_SETMASK, &set, NULL);
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assert (i == 0);
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/* With TERMP passed as NULL we get "\n" -> "\r\n". */
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termios.c_iflag = IGNBRK | IGNPAR;
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termios.c_oflag = 0;
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termios.c_cflag = CS8 | CREAD | CLOCAL | HUPCL | B9600;
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termios.c_lflag = IEXTEN | NOFLSH;
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memset (termios.c_cc, _POSIX_VDISABLE, sizeof (termios.c_cc));
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termios.c_cc[VTIME] = 0;
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termios.c_cc[VMIN ] = 1;
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cfmakeraw (&termios);
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#ifdef FLUSHO
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/* Workaround a readline deadlock bug in _get_tty_settings(). */
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termios.c_lflag &= ~FLUSHO;
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#endif
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child = forkpty (&amaster, childptyname, &termios, NULL);
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switch (child)
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{
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case -1:
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perror ("forkpty(3)");
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exit (EXIT_FAILURE);
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case 0:
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/* Do not replace STDIN as inferiors query its termios. */
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#if 0
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i = close (STDIN_FILENO);
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assert (i == 0);
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i = open ("/dev/null", O_RDONLY);
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assert (i == STDIN_FILENO);
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#endif
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i = sigemptyset (&set);
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assert (i == 0);
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i = sigprocmask (SIG_SETMASK, &set, NULL);
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assert (i == 0);
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/* Do not setpgrp(2) in the parent process as the process-group
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is shared for the whole sh(1) pipeline we could be a part
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of. The process-group is set according to PID of the first
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command in the pipeline.
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We would rip even vi(1) in the case of:
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./orphanripper sh -c 'sleep 1&' | vi -
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*/
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/* Do not setpgrp(2) as our pty would not be ours and we would
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get `SIGSTOP' later, particularly after spawning gdb(1).
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setsid(3) was already executed by forkpty(3) and it would fail if
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executed again. */
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if (getpid() != getpgrp ())
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{
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perror ("getpgrp(2)");
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exit (EXIT_FAILURE);
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}
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execvp (argv[0], argv);
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perror ("execvp(2)");
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exit (EXIT_FAILURE);
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default:
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break;
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}
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i = fcntl (amaster, F_SETFL, O_RDWR | O_NONBLOCK);
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if (i != 0)
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{
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perror ("fcntl (amaster, F_SETFL, O_NONBLOCK)");
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exit (EXIT_FAILURE);
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}
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/* We do not use signal(2) to be sure we do not have SA_RESTART. */
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act.sa_handler = signal_alrm;
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i = sigaction (SIGALRM, &act, NULL);
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assert (i == 0);
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alarm_orig = alarm (timeout);
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assert (alarm_orig == 0);
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i = sigemptyset (&set);
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assert (i == 0);
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while (!signal_alrm_hit)
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{
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struct pollfd pollfd;
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pollfd.fd = amaster;
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pollfd.events = POLLIN;
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i = ppoll (&pollfd, 1, NULL, &set);
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if (i == -1 && errno == EINTR)
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{
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if (child_exited ())
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break;
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/* Non-CHILD child may have exited. */
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continue;
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}
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assert (i == 1);
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/* Data available? Process it first. */
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if (pollfd.revents & POLLIN)
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{
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if (!read_out (amaster))
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{
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fprintf (stderr, "%s: Unexpected EOF\n", progname);
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exit (EXIT_FAILURE);
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}
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}
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if (pollfd.revents & POLLHUP)
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break;
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if ((pollfd.revents &= ~POLLIN) != 0)
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{
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fprintf (stderr, "%s: ppoll(2): revents 0x%x\n", progname,
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(unsigned) pollfd.revents);
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exit (EXIT_FAILURE);
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}
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/* Child exited? */
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if (child_exited ())
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break;
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}
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if (signal_alrm_hit)
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{
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i = kill (child, SIGKILL);
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assert (i == 0);
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}
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else
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alarm (0);
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/* WNOHANG still could fail. */
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child_got = waitpid (child, &status, 0);
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if (child != child_got)
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{
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fprintf (stderr, "waitpid (%d) = %d: %m\n", (int) child, (int) child_got);
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exit (EXIT_FAILURE);
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}
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if (signal_alrm_hit)
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{
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char *buf;
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if (asprintf (&buf, "Timed out after %d seconds", timeout) != -1)
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{
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print_child_error (buf, argv);
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free (buf);
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}
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rc = 128 + SIGALRM;
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}
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else if (WIFEXITED (status))
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rc = WEXITSTATUS (status);
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else if (WIFSIGNALED (status))
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{
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print_child_error (strsignal (WTERMSIG (status)), argv);
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rc = 128 + WTERMSIG (status);
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}
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else if (WIFSTOPPED (status))
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{
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fprintf (stderr, "waitpid (%d): WIFSTOPPED - WSTOPSIG is %d\n",
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(int) child, WSTOPSIG (status));
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exit (EXIT_FAILURE);
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}
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else
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{
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fprintf (stderr, "waitpid (%d): !WIFEXITED (%d)\n", (int) child, status);
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exit (EXIT_FAILURE);
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}
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/* Not used in fact. */
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i = sigprocmask (SIG_SETMASK, &set, NULL);
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assert (i == 0);
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/* Do not unset O_NONBLOCK as a stale child (the whole purpose of this
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program) having open its output pty would block us in read_out. */
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#if 0
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i = fcntl (amaster, F_SETFL, O_RDONLY /* !O_NONBLOCK */);
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if (i != 0)
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{
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perror ("fcntl (amaster, F_SETFL, O_RDONLY /* !O_NONBLOCK */)");
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exit (EXIT_FAILURE);
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}
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#endif
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while (read_out (amaster));
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/* Do not close the master FD as the child would have `/dev/pts/23 (deleted)'
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entries which are not expected (and expecting ` (deleted)' would be
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a race. */
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#if 0
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i = close (amaster);
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if (i != 0)
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{
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perror ("close (forkpty ()'s amaster)");
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exit (EXIT_FAILURE);
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}
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#endif
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return rc;
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}
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/* Detected commandline may look weird due to a race:
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Original command:
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./orphanripper sh -c 'sleep 1&' &
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Correct output:
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[1] 29610
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./orphanripper: Killed -9 orphan PID 29612 (PGID 29611): sleep 1
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Raced output (sh(1) child still did not update its argv[]):
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[1] 29613
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./orphanripper: Killed -9 orphan PID 29615 (PGID 29614): sh -c sleep 1&
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We could delay a bit before ripping the children. */
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static const char *read_cmdline (pid_t pid)
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{
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char cmdline_fname[32];
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static char cmdline[LINE_MAX];
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int fd;
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ssize_t got;
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char *s;
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if (snprintf (cmdline_fname, sizeof cmdline_fname, "/proc/%d/cmdline",
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(int) pid) < 0)
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return NULL;
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fd = open (cmdline_fname, O_RDONLY);
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if (fd == -1)
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{
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/* It may have already exited - ENOENT. */
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#if 0
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fprintf (stderr, "%s: open (\"%s\"): %m\n", progname, cmdline_fname);
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#endif
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return NULL;
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}
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got = read (fd, cmdline, sizeof (cmdline) - 1);
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if (got == -1)
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fprintf (stderr, "%s: read (\"%s\"): %m\n", progname,
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cmdline_fname);
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if (close (fd) != 0)
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fprintf (stderr, "%s: close (\"%s\"): %m\n", progname,
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cmdline_fname);
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if (got < 0)
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return NULL;
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/* Convert '\0' argument delimiters to spaces. */
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for (s = cmdline; s < cmdline + got; s++)
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if (!*s)
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*s = ' ';
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/* Trim the trailing spaces (typically single '\0'->' '). */
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while (s > cmdline && isspace (s[-1]))
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s--;
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*s = 0;
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return cmdline;
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}
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static int dir_scan (const char *dirname,
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int (*callback) (struct dirent *dirent, const char *pathname))
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{
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DIR *dir;
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struct dirent *dirent;
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int rc = 0;
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dir = opendir (dirname);
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if (dir == NULL)
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{
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if (errno == EACCES || errno == ENOENT)
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return rc;
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fprintf (stderr, "%s: opendir (\"%s\"): %m\n", progname, dirname);
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exit (EXIT_FAILURE);
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}
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while ((errno = 0, dirent = readdir (dir)))
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{
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char pathname[LINE_MAX];
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int pathname_len;
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pathname_len = snprintf (pathname, sizeof pathname, "%s/%s",
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dirname, dirent->d_name);
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if (pathname_len <= 0 || pathname_len >= (int) sizeof pathname)
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{
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fprintf (stderr, "entry file name too long: `%s' / `%s'\n",
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dirname, dirent->d_name);
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continue;
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}
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/* RHEL-4.5 on s390x never fills in D_TYPE. */
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if (dirent->d_type == DT_UNKNOWN)
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{
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struct stat statbuf;
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int i;
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/* We are not interested in the /proc/PID/fd/ links targets. */
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i = lstat (pathname, &statbuf);
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if (i == -1)
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{
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if (errno == EACCES || errno == ENOENT)
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continue;
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fprintf (stderr, "%s: stat (\"%s\"): %m\n", progname, pathname);
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exit (EXIT_FAILURE);
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}
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if (S_ISDIR (statbuf.st_mode))
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dirent->d_type = DT_DIR;
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if (S_ISLNK (statbuf.st_mode))
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dirent->d_type = DT_LNK;
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/* No other D_TYPE types used in this code. */
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}
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rc = (*callback) (dirent, pathname);
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if (rc != 0)
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{
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errno = 0;
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break;
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}
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}
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if (errno != 0)
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{
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fprintf (stderr, "%s: readdir (\"%s\"): %m\n", progname, dirname);
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exit (EXIT_FAILURE);
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}
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if (closedir (dir) != 0)
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{
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fprintf (stderr, "%s: closedir (\"%s\"): %m\n", progname, dirname);
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exit (EXIT_FAILURE);
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}
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return rc;
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}
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static int fd_fs_scan (pid_t pid, int (*func) (pid_t pid, const char *link))
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|
{
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char dirname[64];
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if (snprintf (dirname, sizeof dirname, "/proc/%d/fd", (int) pid) < 0)
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{
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perror ("snprintf(3)");
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exit (EXIT_FAILURE);
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|
}
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int callback (struct dirent *dirent, const char *pathname)
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{
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char buf[LINE_MAX];
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ssize_t buf_len;
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if ((dirent->d_type != DT_DIR && dirent->d_type != DT_LNK)
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|| (dirent->d_type == DT_DIR && strcmp (dirent->d_name, ".") != 0
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&& strcmp (dirent->d_name, "..") != 0)
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|| (dirent->d_type == DT_LNK && strspn (dirent->d_name, "0123456789")
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!= strlen (dirent->d_name)))
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{
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fprintf (stderr, "Unexpected entry \"%s\" (d_type %u)"
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" on readdir (\"%s\"): %m\n",
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dirent->d_name, (unsigned) dirent->d_type, dirname);
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return 0;
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}
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if (dirent->d_type == DT_DIR)
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return 0;
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buf_len = readlink (pathname, buf, sizeof buf - 1);
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if (buf_len <= 0 || buf_len >= (ssize_t) sizeof buf - 1)
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{
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if (errno != ENOENT && errno != EACCES)
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fprintf (stderr, "Error reading link \"%s\": %m\n", pathname);
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return 0;
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}
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|
buf[buf_len] = 0;
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return (*func) (pid, buf);
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|
}
|
|
|
|
return dir_scan (dirname, callback);
|
|
}
|
|
|
|
static void pid_fs_scan (void (*func) (pid_t pid, void *data), void *data)
|
|
{
|
|
int callback (struct dirent *dirent, const char *pathname)
|
|
{
|
|
if (dirent->d_type != DT_DIR
|
|
|| strspn (dirent->d_name, "0123456789") != strlen (dirent->d_name))
|
|
return 0;
|
|
(*func) (atoi (dirent->d_name), data);
|
|
return 0;
|
|
}
|
|
|
|
dir_scan ("/proc", callback);
|
|
}
|
|
|
|
static int rip_check_ptyname (pid_t pid, const char *link)
|
|
{
|
|
assert (pid != getpid ());
|
|
|
|
return strcmp (link, childptyname) == 0;
|
|
}
|
|
|
|
struct pid
|
|
{
|
|
struct pid *next;
|
|
pid_t pid;
|
|
};
|
|
static struct pid *pid_list;
|
|
|
|
static int pid_found (pid_t pid)
|
|
{
|
|
struct pid *entry;
|
|
|
|
for (entry = pid_list; entry != NULL; entry = entry->next)
|
|
if (entry->pid == pid)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/* Single pass is not enough, a (multithreaded) process was seen to survive.
|
|
Repeated killing of the same process is not enough, zombies can be killed.
|
|
*/
|
|
static int cleanup_acted;
|
|
|
|
static void pid_record (pid_t pid)
|
|
{
|
|
struct pid *entry;
|
|
|
|
if (pid_found (pid))
|
|
return;
|
|
cleanup_acted = 1;
|
|
|
|
entry = malloc (sizeof (*entry));
|
|
if (entry == NULL)
|
|
{
|
|
fprintf (stderr, "%s: malloc: %m\n", progname);
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
entry->pid = pid;
|
|
entry->next = pid_list;
|
|
pid_list = entry;
|
|
}
|
|
|
|
static void pid_forall (void (*func) (pid_t pid))
|
|
{
|
|
struct pid *entry;
|
|
|
|
for (entry = pid_list; entry != NULL; entry = entry->next)
|
|
(*func) (entry->pid);
|
|
}
|
|
|
|
/* Returns 0 on failure. */
|
|
static pid_t pid_get_parent (pid_t pid)
|
|
{
|
|
char fname[64];
|
|
FILE *f;
|
|
char line[LINE_MAX];
|
|
pid_t retval = 0;
|
|
|
|
if (snprintf (fname, sizeof fname, "/proc/%d/status", (int) pid) < 0)
|
|
{
|
|
perror ("snprintf(3)");
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
f = fopen (fname, "r");
|
|
if (f == NULL)
|
|
{
|
|
return 0;
|
|
}
|
|
while (errno = 0, fgets (line, sizeof line, f) == line)
|
|
{
|
|
if (strncmp (line, "PPid:\t", sizeof "PPid:\t" - 1) != 0)
|
|
continue;
|
|
retval = atoi (line + sizeof "PPid:\t" - 1);
|
|
errno = 0;
|
|
break;
|
|
}
|
|
if (errno != 0)
|
|
{
|
|
fprintf (stderr, "%s: fgets (\"%s\"): %m\n", progname, fname);
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
if (fclose (f) != 0)
|
|
{
|
|
fprintf (stderr, "%s: fclose (\"%s\"): %m\n", progname, fname);
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
static void killtree (pid_t pid);
|
|
|
|
static void killtree_pid_fs_scan (pid_t pid, void *data)
|
|
{
|
|
pid_t parent_pid = *(pid_t *) data;
|
|
|
|
/* Do not optimize it as we could miss some newly spawned processes.
|
|
Always traverse all the leaves. */
|
|
#if 0
|
|
/* Optimization. */
|
|
if (pid_found (pid))
|
|
return;
|
|
#endif
|
|
|
|
if (pid_get_parent (pid) != parent_pid)
|
|
return;
|
|
|
|
killtree (pid);
|
|
}
|
|
|
|
static void killtree (pid_t pid)
|
|
{
|
|
pid_record (pid);
|
|
pid_fs_scan (killtree_pid_fs_scan, &pid);
|
|
}
|
|
|
|
static void rip_pid_fs_scan (pid_t pid, void *data)
|
|
{
|
|
pid_t pgid;
|
|
|
|
/* Shouldn't happen. */
|
|
if (pid == getpid ())
|
|
return;
|
|
|
|
/* Check both PGID and the stale file descriptors. */
|
|
pgid = getpgid (pid);
|
|
if (pgid == child
|
|
|| fd_fs_scan (pid, rip_check_ptyname) != 0)
|
|
killtree (pid);
|
|
}
|
|
|
|
static void killproc (pid_t pid)
|
|
{
|
|
const char *cmdline;
|
|
|
|
cmdline = read_cmdline (pid);
|
|
/* Avoid printing the message for already gone processes. */
|
|
if (kill (pid, 0) != 0 && errno == ESRCH)
|
|
return;
|
|
if (cmdline == NULL)
|
|
cmdline = "<error>";
|
|
fprintf (stderr, "%s: Killed -9 orphan PID %d: %s\n", progname, (int) pid, cmdline);
|
|
if (kill (pid, SIGKILL) == 0)
|
|
cleanup_acted = 1;
|
|
else if (errno != ESRCH)
|
|
fprintf (stderr, "%s: kill (%d, SIGKILL): %m\n", progname, (int) pid);
|
|
/* RHEL-3 kernels cannot SIGKILL a `T (stopped)' process. */
|
|
kill (pid, SIGCONT);
|
|
/* Do not waitpid(2) as it cannot be our direct descendant and it gets
|
|
cleaned up by init(8). */
|
|
#if 0
|
|
pid_t pid_got;
|
|
pid_got = waitpid (pid, NULL, 0);
|
|
if (pid != pid_got)
|
|
{
|
|
fprintf (stderr, "%s: waitpid (%d) != %d: %m\n", progname,
|
|
(int) pid, (int) pid_got);
|
|
return;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void rip (void)
|
|
{
|
|
cleanup_acted = 0;
|
|
do
|
|
{
|
|
if (cleanup_acted)
|
|
usleep (1000000 / 10);
|
|
cleanup_acted = 0;
|
|
pid_fs_scan (rip_pid_fs_scan, NULL);
|
|
pid_forall (killproc);
|
|
}
|
|
while (cleanup_acted);
|
|
}
|
|
|
|
int main (int argc, char **argv)
|
|
{
|
|
int timeout = 0;
|
|
int rc;
|
|
|
|
progname = *argv++;
|
|
argc--;
|
|
|
|
if (argc < 1 || strcmp (*argv, "-h") == 0
|
|
|| strcmp (*argv, "--help") == 0)
|
|
{
|
|
puts ("Syntax: orphanripper [-t <seconds>] <execvp(3) commandline>");
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
if ((*argv)[0] == '-' && (*argv)[1] == 't')
|
|
{
|
|
char *timeout_s = NULL;
|
|
|
|
if ((*argv)[2] == 0)
|
|
timeout_s = *++argv;
|
|
else if (isdigit ((*argv)[2]))
|
|
timeout_s = (*argv) + 2;
|
|
if (timeout_s != NULL)
|
|
{
|
|
long l;
|
|
char *endptr;
|
|
|
|
argv++;
|
|
l = strtol (timeout_s, &endptr, 0);
|
|
timeout = l;
|
|
if ((endptr != NULL && *endptr != 0) || timeout < 0 || timeout != l)
|
|
{
|
|
fprintf (stderr, "%s: Invalid timeout value: %s\n", progname,
|
|
timeout_s);
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
}
|
|
}
|
|
|
|
rc = spawn (argv, timeout);
|
|
rip ();
|
|
return rc;
|
|
}
|