bsd-user/freebsd/os-proc.c

   1 /*
   2  *  FreeBSD process related emulation code
   3  *
   4  *  Copyright (c) 2013-15 Stacey D. Son
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19 #include "qemu/osdep.h"
  20
  21 #include <sys/param.h>
  22 #include <sys/queue.h>
  23 #include <sys/sysctl.h>
  24 struct kinfo_proc;
  25 #include <libprocstat.h>
  26
  27 #include "qemu.h"
  28
  29 /*
  30  * Get the filename for the given file descriptor.
  31  * Note that this may return NULL (fail) if no longer cached in the kernel.
  32  */
  33 char *
  34 get_filename_from_fd(pid_t pid, int fd, char *filename, size_t len);
  35 char *
  36 get_filename_from_fd(pid_t pid, int fd, char *filename, size_t len)
  37 {
  38     char *ret = NULL;
  39     unsigned int cnt;
  40     struct procstat *procstat = NULL;
  41     struct kinfo_proc *kp = NULL;
  42     struct filestat_list *head = NULL;
  43     struct filestat *fst;
  44
  45     procstat = procstat_open_sysctl();
  46     if (procstat == NULL) {
  47         goto out;
  48     }
  49
  50     kp = procstat_getprocs(procstat, KERN_PROC_PID, pid, &cnt);
  51     if (kp == NULL) {
  52         goto out;
  53     }
  54
  55     head = procstat_getfiles(procstat, kp, 0);
  56     if (head == NULL) {
  57         goto out;
  58     }
  59
  60     STAILQ_FOREACH(fst, head, next) {
  61         if (fd == fst->fs_fd) {
  62             if (fst->fs_path != NULL) {
  63                 (void)strlcpy(filename, fst->fs_path, len);
  64                 ret = filename;
  65             }
  66             break;
  67         }
  68     }
  69
  70 out:
  71     if (head != NULL) {
  72         procstat_freefiles(procstat, head);
  73     }
  74     if (kp != NULL) {
  75         procstat_freeprocs(procstat, kp);
  76     }
  77     if (procstat != NULL) {
  78         procstat_close(procstat);
  79     }
  80     return ret;
  81 }
  82