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bsd-user: Implement get_filename_from_fd.

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Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Karim Taha <kariem.taha2.7@gmail.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Warner Losh <imp@bsdimp.com>
Message-Id: <20230925182425.3163-20-kariem.taha2.7@gmail.com>
This commit is contained in:
Karim Taha 2023-09-25 21:24:16 +03:00 committed by Warner Losh
parent ff26637260
commit 84d41c5e6d
2 changed files with 83 additions and 0 deletions
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1
bsd-user/freebsd/meson.build
View File

@ -1,5 +1,6 @@
bsd_user_ss.add(files(
'os-stat.c',
'os-proc.c',
'os-sys.c',
'os-syscall.c',
))

82
bsd-user/freebsd/os-proc.c Normal file
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@ -0,0 +1,82 @@
/*
* FreeBSD process related emulation code
*
* Copyright (c) 2013-15 Stacey D. Son
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/sysctl.h>
struct kinfo_proc;
#include <libprocstat.h>
#include "qemu.h"
/*
* Get the filename for the given file descriptor.
* Note that this may return NULL (fail) if no longer cached in the kernel.
*/
char *
get_filename_from_fd(pid_t pid, int fd, char *filename, size_t len);
char *
get_filename_from_fd(pid_t pid, int fd, char *filename, size_t len)
{
char *ret = NULL;
unsigned int cnt;
struct procstat *procstat = NULL;
struct kinfo_proc *kp = NULL;
struct filestat_list *head = NULL;
struct filestat *fst;
procstat = procstat_open_sysctl();
if (procstat == NULL) {
goto out;
}
kp = procstat_getprocs(procstat, KERN_PROC_PID, pid, &cnt);
if (kp == NULL) {
goto out;
}
head = procstat_getfiles(procstat, kp, 0);
if (head == NULL) {
goto out;
}
STAILQ_FOREACH(fst, head, next) {
if (fd == fst->fs_fd) {
if (fst->fs_path != NULL) {
(void)strlcpy(filename, fst->fs_path, len);
ret = filename;
}
break;
}
}
out:
if (head != NULL) {
procstat_freefiles(procstat, head);
}
if (kp != NULL) {
procstat_freeprocs(procstat, kp);
}
if (procstat != NULL) {
procstat_close(procstat);
}
return ret;
}