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 83