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Code Issues Releases Wiki Activity
linux-stable/tools/bpf/bpftool/common.c
Tony Ambardar 9165e1d70f bpftool: Use only nftw for file tree parsing 
The bpftool sources include code to walk file trees, but use multiple
frameworks to do so: nftw and fts. While nftw conforms to POSIX/SUSv3 and
is widely available, fts is not conformant and less common, especially on
non-glibc systems. The inconsistent framework usage hampers maintenance
and portability of bpftool, in particular for embedded systems.

Standardize code usage by rewriting one fts-based function to use nftw and
clean up some related function warnings by extending use of "const char *"
arguments. This change helps in building bpftool against musl for OpenWrt.

Also fix an unsafe call to dirname() by duplicating the string to pass,
since some implementations may directly alter it. The same approach is
used in libbpf.c.

Signed-off-by: Tony Ambardar <Tony.Ambardar@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Link: https://lore.kernel.org/bpf/20200721024817.13701-1-Tony.Ambardar@gmail.com
2020-07-21 23:42:56 +02:00

952 lines
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// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2017-2018 Netronome Systems, Inc. */
#define _GNU_SOURCE
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <ftw.h>
#include <libgen.h>
#include <mntent.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <linux/limits.h>
#include <linux/magic.h>
#include <net/if.h>
#include <sys/mount.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/vfs.h>
#include <bpf/bpf.h>
#include <bpf/libbpf.h> /* libbpf_num_possible_cpus */
#include "main.h"
#ifndef BPF_FS_MAGIC
#define BPF_FS_MAGIC 0xcafe4a11
#endif
const char * const attach_type_name[__MAX_BPF_ATTACH_TYPE] = {
[BPF_CGROUP_INET_INGRESS] = "ingress",
[BPF_CGROUP_INET_EGRESS] = "egress",
[BPF_CGROUP_INET_SOCK_CREATE] = "sock_create",
[BPF_CGROUP_INET_SOCK_RELEASE] = "sock_release",
[BPF_CGROUP_SOCK_OPS] = "sock_ops",
[BPF_CGROUP_DEVICE] = "device",
[BPF_CGROUP_INET4_BIND] = "bind4",
[BPF_CGROUP_INET6_BIND] = "bind6",
[BPF_CGROUP_INET4_CONNECT] = "connect4",
[BPF_CGROUP_INET6_CONNECT] = "connect6",
[BPF_CGROUP_INET4_POST_BIND] = "post_bind4",
[BPF_CGROUP_INET6_POST_BIND] = "post_bind6",
[BPF_CGROUP_INET4_GETPEERNAME] = "getpeername4",
[BPF_CGROUP_INET6_GETPEERNAME] = "getpeername6",
[BPF_CGROUP_INET4_GETSOCKNAME] = "getsockname4",
[BPF_CGROUP_INET6_GETSOCKNAME] = "getsockname6",
[BPF_CGROUP_UDP4_SENDMSG] = "sendmsg4",
[BPF_CGROUP_UDP6_SENDMSG] = "sendmsg6",
[BPF_CGROUP_SYSCTL] = "sysctl",
[BPF_CGROUP_UDP4_RECVMSG] = "recvmsg4",
[BPF_CGROUP_UDP6_RECVMSG] = "recvmsg6",
[BPF_CGROUP_GETSOCKOPT] = "getsockopt",
[BPF_CGROUP_SETSOCKOPT] = "setsockopt",
[BPF_SK_SKB_STREAM_PARSER] = "sk_skb_stream_parser",
[BPF_SK_SKB_STREAM_VERDICT] = "sk_skb_stream_verdict",
[BPF_SK_MSG_VERDICT] = "sk_msg_verdict",
[BPF_LIRC_MODE2] = "lirc_mode2",
[BPF_FLOW_DISSECTOR] = "flow_dissector",
[BPF_TRACE_RAW_TP] = "raw_tp",
[BPF_TRACE_FENTRY] = "fentry",
[BPF_TRACE_FEXIT] = "fexit",
[BPF_MODIFY_RETURN] = "mod_ret",
[BPF_LSM_MAC] = "lsm_mac",
[BPF_SK_LOOKUP] = "sk_lookup",
};
void p_err(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (json_output) {
jsonw_start_object(json_wtr);
jsonw_name(json_wtr, "error");
jsonw_vprintf_enquote(json_wtr, fmt, ap);
jsonw_end_object(json_wtr);
} else {
fprintf(stderr, "Error: ");
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
}
va_end(ap);
}
void p_info(const char *fmt, ...)
{
va_list ap;
if (json_output)
return;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
va_end(ap);
}
static bool is_bpffs(char *path)
{
struct statfs st_fs;
if (statfs(path, &st_fs) < 0)
return false;
return (unsigned long)st_fs.f_type == BPF_FS_MAGIC;
}
void set_max_rlimit(void)
{
struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY };
setrlimit(RLIMIT_MEMLOCK, &rinf);
}
static int
mnt_fs(const char *target, const char *type, char *buff, size_t bufflen)
{
bool bind_done = false;
while (mount("", target, "none", MS_PRIVATE | MS_REC, NULL)) {
if (errno != EINVAL || bind_done) {
snprintf(buff, bufflen,
"mount --make-private %s failed: %s",
target, strerror(errno));
return -1;
}
if (mount(target, target, "none", MS_BIND, NULL)) {
snprintf(buff, bufflen,
"mount --bind %s %s failed: %s",
target, target, strerror(errno));
return -1;
}
bind_done = true;
}
if (mount(type, target, type, 0, "mode=0700")) {
snprintf(buff, bufflen, "mount -t %s %s %s failed: %s",
type, type, target, strerror(errno));
return -1;
}
return 0;
}
int mount_tracefs(const char *target)
{
char err_str[ERR_MAX_LEN];
int err;
err = mnt_fs(target, "tracefs", err_str, ERR_MAX_LEN);
if (err) {
err_str[ERR_MAX_LEN - 1] = '\0';
p_err("can't mount tracefs: %s", err_str);
}
return err;
}
int open_obj_pinned(const char *path, bool quiet)
{
char *pname;
int fd = -1;
pname = strdup(path);
if (!pname) {
if (!quiet)
p_err("mem alloc failed");
goto out_ret;
}
fd = bpf_obj_get(pname);
if (fd < 0) {
if (!quiet)
p_err("bpf obj get (%s): %s", pname,
errno == EACCES && !is_bpffs(dirname(pname)) ?
"directory not in bpf file system (bpffs)" :
strerror(errno));
goto out_free;
}
out_free:
free(pname);
out_ret:
return fd;
}
int open_obj_pinned_any(const char *path, enum bpf_obj_type exp_type)
{
enum bpf_obj_type type;
int fd;
fd = open_obj_pinned(path, false);
if (fd < 0)
return -1;
type = get_fd_type(fd);
if (type < 0) {
close(fd);
return type;
}
if (type != exp_type) {
p_err("incorrect object type: %s", get_fd_type_name(type));
close(fd);
return -1;
}
return fd;
}
int mount_bpffs_for_pin(const char *name)
{
char err_str[ERR_MAX_LEN];
char *file;
char *dir;
int err = 0;
file = malloc(strlen(name) + 1);
strcpy(file, name);
dir = dirname(file);
if (is_bpffs(dir))
/* nothing to do if already mounted */
goto out_free;
if (block_mount) {
p_err("no BPF file system found, not mounting it due to --nomount option");
err = -1;
goto out_free;
}
err = mnt_fs(dir, "bpf", err_str, ERR_MAX_LEN);
if (err) {
err_str[ERR_MAX_LEN - 1] = '\0';
p_err("can't mount BPF file system to pin the object (%s): %s",
name, err_str);
}
out_free:
free(file);
return err;
}
int do_pin_fd(int fd, const char *name)
{
int err;
err = mount_bpffs_for_pin(name);
if (err)
return err;
err = bpf_obj_pin(fd, name);
if (err)
p_err("can't pin the object (%s): %s", name, strerror(errno));
return err;
}
int do_pin_any(int argc, char **argv, int (*get_fd)(int *, char ***))
{
int err;
int fd;
fd = get_fd(&argc, &argv);
if (fd < 0)
return fd;
err = do_pin_fd(fd, *argv);
close(fd);
return err;
}
const char *get_fd_type_name(enum bpf_obj_type type)
{
static const char * const names[] = {
[BPF_OBJ_UNKNOWN] = "unknown",
[BPF_OBJ_PROG] = "prog",
[BPF_OBJ_MAP] = "map",
};
if (type < 0 || type >= ARRAY_SIZE(names) || !names[type])
return names[BPF_OBJ_UNKNOWN];
return names[type];
}
int get_fd_type(int fd)
{
char path[PATH_MAX];
char buf[512];
ssize_t n;
snprintf(path, sizeof(path), "/proc/self/fd/%d", fd);
n = readlink(path, buf, sizeof(buf));
if (n < 0) {
p_err("can't read link type: %s", strerror(errno));
return -1;
}
if (n == sizeof(path)) {
p_err("can't read link type: path too long!");
return -1;
}
if (strstr(buf, "bpf-map"))
return BPF_OBJ_MAP;
else if (strstr(buf, "bpf-prog"))
return BPF_OBJ_PROG;
else if (strstr(buf, "bpf-link"))
return BPF_OBJ_LINK;
return BPF_OBJ_UNKNOWN;
}
char *get_fdinfo(int fd, const char *key)
{
char path[PATH_MAX];
char *line = NULL;
size_t line_n = 0;
ssize_t n;
FILE *fdi;
snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd);
fdi = fopen(path, "r");
if (!fdi)
return NULL;
while ((n = getline(&line, &line_n, fdi)) > 0) {
char *value;
int len;
if (!strstr(line, key))
continue;
fclose(fdi);
value = strchr(line, '\t');
if (!value || !value[1]) {
free(line);
return NULL;
}
value++;
len = strlen(value);
memmove(line, value, len);
line[len - 1] = '\0';
return line;
}
free(line);
fclose(fdi);
return NULL;
}
void print_data_json(uint8_t *data, size_t len)
{
unsigned int i;
jsonw_start_array(json_wtr);
for (i = 0; i < len; i++)
jsonw_printf(json_wtr, "%d", data[i]);
jsonw_end_array(json_wtr);
}
void print_hex_data_json(uint8_t *data, size_t len)
{
unsigned int i;
jsonw_start_array(json_wtr);
for (i = 0; i < len; i++)
jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]);
jsonw_end_array(json_wtr);
}
/* extra params for nftw cb */
static struct pinned_obj_table *build_fn_table;
static enum bpf_obj_type build_fn_type;
static int do_build_table_cb(const char *fpath, const struct stat *sb,
int typeflag, struct FTW *ftwbuf)
{
struct bpf_prog_info pinned_info;
__u32 len = sizeof(pinned_info);
struct pinned_obj *obj_node;
enum bpf_obj_type objtype;
int fd, err = 0;
if (typeflag != FTW_F)
goto out_ret;
fd = open_obj_pinned(fpath, true);
if (fd < 0)
goto out_ret;
objtype = get_fd_type(fd);
if (objtype != build_fn_type)
goto out_close;
memset(&pinned_info, 0, sizeof(pinned_info));
if (bpf_obj_get_info_by_fd(fd, &pinned_info, &len))
goto out_close;
obj_node = calloc(1, sizeof(*obj_node));
if (!obj_node) {
err = -1;
goto out_close;
}
obj_node->id = pinned_info.id;
obj_node->path = strdup(fpath);
if (!obj_node->path) {
err = -1;
free(obj_node);
goto out_close;
}
hash_add(build_fn_table->table, &obj_node->hash, obj_node->id);
out_close:
close(fd);
out_ret:
return err;
}
int build_pinned_obj_table(struct pinned_obj_table *tab,
enum bpf_obj_type type)
{
struct mntent *mntent = NULL;
FILE *mntfile = NULL;
int flags = FTW_PHYS;
int nopenfd = 16;
int err = 0;
mntfile = setmntent("/proc/mounts", "r");
if (!mntfile)
return -1;
build_fn_table = tab;
build_fn_type = type;
while ((mntent = getmntent(mntfile))) {
char *path = mntent->mnt_dir;
if (strncmp(mntent->mnt_type, "bpf", 3) != 0)
continue;
err = nftw(path, do_build_table_cb, nopenfd, flags);
if (err)
break;
}
fclose(mntfile);
return err;
}
void delete_pinned_obj_table(struct pinned_obj_table *tab)
{
struct pinned_obj *obj;
struct hlist_node *tmp;
unsigned int bkt;
hash_for_each_safe(tab->table, bkt, tmp, obj, hash) {
hash_del(&obj->hash);
free(obj->path);
free(obj);
}
}
unsigned int get_page_size(void)
{
static int result;
if (!result)
result = getpagesize();
return result;
}
unsigned int get_possible_cpus(void)
{
int cpus = libbpf_num_possible_cpus();
if (cpus < 0) {
p_err("Can't get # of possible cpus: %s", strerror(-cpus));
exit(-1);
}
return cpus;
}
static char *
ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf)
{
struct stat st;
int err;
err = stat("/proc/self/ns/net", &st);
if (err) {
p_err("Can't stat /proc/self: %s", strerror(errno));
return NULL;
}
if (st.st_dev != ns_dev || st.st_ino != ns_ino)
return NULL;
return if_indextoname(ifindex, buf);
}
static int read_sysfs_hex_int(char *path)
{
char vendor_id_buf[8];
int len;
int fd;
fd = open(path, O_RDONLY);
if (fd < 0) {
p_err("Can't open %s: %s", path, strerror(errno));
return -1;
}
len = read(fd, vendor_id_buf, sizeof(vendor_id_buf));
close(fd);
if (len < 0) {
p_err("Can't read %s: %s", path, strerror(errno));
return -1;
}
if (len >= (int)sizeof(vendor_id_buf)) {
p_err("Value in %s too long", path);
return -1;
}
vendor_id_buf[len] = 0;
return strtol(vendor_id_buf, NULL, 0);
}
static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name)
{
char full_path[64];
snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s",
devname, entry_name);
return read_sysfs_hex_int(full_path);
}
const char *
ifindex_to_bfd_params(__u32 ifindex, __u64 ns_dev, __u64 ns_ino,
const char **opt)
{
char devname[IF_NAMESIZE];
int vendor_id;
int device_id;
if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) {
p_err("Can't get net device name for ifindex %d: %s", ifindex,
strerror(errno));
return NULL;
}
vendor_id = read_sysfs_netdev_hex_int(devname, "vendor");
if (vendor_id < 0) {
p_err("Can't get device vendor id for %s", devname);
return NULL;
}
switch (vendor_id) {
case 0x19ee:
device_id = read_sysfs_netdev_hex_int(devname, "device");
if (device_id != 0x4000 &&
device_id != 0x6000 &&
device_id != 0x6003)
p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch");
*opt = "ctx4";
return "NFP-6xxx";
default:
p_err("Can't get bfd arch name for device vendor id 0x%04x",
vendor_id);
return NULL;
}
}
void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
{
char name[IF_NAMESIZE];
if (!ifindex)
return;
printf(" offloaded_to ");
if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
printf("%s", name);
else
printf("ifindex %u ns_dev %llu ns_ino %llu",
ifindex, ns_dev, ns_inode);
}
void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
{
char name[IF_NAMESIZE];
if (!ifindex)
return;
jsonw_name(json_wtr, "dev");
jsonw_start_object(json_wtr);
jsonw_uint_field(json_wtr, "ifindex", ifindex);
jsonw_uint_field(json_wtr, "ns_dev", ns_dev);
jsonw_uint_field(json_wtr, "ns_inode", ns_inode);
if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
jsonw_string_field(json_wtr, "ifname", name);
jsonw_end_object(json_wtr);
}
int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what)
{
char *endptr;
NEXT_ARGP();
if (*val) {
p_err("%s already specified", what);
return -1;
}
*val = strtoul(**argv, &endptr, 0);
if (*endptr) {
p_err("can't parse %s as %s", **argv, what);
return -1;
}
NEXT_ARGP();
return 0;
}
int __printf(2, 0)
print_all_levels(__maybe_unused enum libbpf_print_level level,
const char *format, va_list args)
{
return vfprintf(stderr, format, args);
}
static int prog_fd_by_nametag(void *nametag, int **fds, bool tag)
{
unsigned int id = 0;
int fd, nb_fds = 0;
void *tmp;
int err;
while (true) {
struct bpf_prog_info info = {};
__u32 len = sizeof(info);
err = bpf_prog_get_next_id(id, &id);
if (err) {
if (errno != ENOENT) {
p_err("%s", strerror(errno));
goto err_close_fds;
}
return nb_fds;
}
fd = bpf_prog_get_fd_by_id(id);
if (fd < 0) {
p_err("can't get prog by id (%u): %s",
id, strerror(errno));
goto err_close_fds;
}
err = bpf_obj_get_info_by_fd(fd, &info, &len);
if (err) {
p_err("can't get prog info (%u): %s",
id, strerror(errno));
goto err_close_fd;
}
if ((tag && memcmp(nametag, info.tag, BPF_TAG_SIZE)) ||
(!tag && strncmp(nametag, info.name, BPF_OBJ_NAME_LEN))) {
close(fd);
continue;
}
if (nb_fds > 0) {
tmp = realloc(*fds, (nb_fds + 1) * sizeof(int));
if (!tmp) {
p_err("failed to realloc");
goto err_close_fd;
}
*fds = tmp;
}
(*fds)[nb_fds++] = fd;
}
err_close_fd:
close(fd);
err_close_fds:
while (--nb_fds >= 0)
close((*fds)[nb_fds]);
return -1;
}
int prog_parse_fds(int *argc, char ***argv, int **fds)
{
if (is_prefix(**argv, "id")) {
unsigned int id;
char *endptr;
NEXT_ARGP();
id = strtoul(**argv, &endptr, 0);
if (*endptr) {
p_err("can't parse %s as ID", **argv);
return -1;
}
NEXT_ARGP();
(*fds)[0] = bpf_prog_get_fd_by_id(id);
if ((*fds)[0] < 0) {
p_err("get by id (%u): %s", id, strerror(errno));
return -1;
}
return 1;
} else if (is_prefix(**argv, "tag")) {
unsigned char tag[BPF_TAG_SIZE];
NEXT_ARGP();
if (sscanf(**argv, BPF_TAG_FMT, tag, tag + 1, tag + 2,
tag + 3, tag + 4, tag + 5, tag + 6, tag + 7)
!= BPF_TAG_SIZE) {
p_err("can't parse tag");
return -1;
}
NEXT_ARGP();
return prog_fd_by_nametag(tag, fds, true);
} else if (is_prefix(**argv, "name")) {
char *name;
NEXT_ARGP();
name = **argv;
if (strlen(name) > BPF_OBJ_NAME_LEN - 1) {
p_err("can't parse name");
return -1;
}
NEXT_ARGP();
return prog_fd_by_nametag(name, fds, false);
} else if (is_prefix(**argv, "pinned")) {
char *path;
NEXT_ARGP();
path = **argv;
NEXT_ARGP();
(*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_PROG);
if ((*fds)[0] < 0)
return -1;
return 1;
}
p_err("expected 'id', 'tag', 'name' or 'pinned', got: '%s'?", **argv);
return -1;
}
int prog_parse_fd(int *argc, char ***argv)
{
int *fds = NULL;
int nb_fds, fd;
fds = malloc(sizeof(int));
if (!fds) {
p_err("mem alloc failed");
return -1;
}
nb_fds = prog_parse_fds(argc, argv, &fds);
if (nb_fds != 1) {
if (nb_fds > 1) {
p_err("several programs match this handle");
while (nb_fds--)
close(fds[nb_fds]);
}
fd = -1;
goto exit_free;
}
fd = fds[0];
exit_free:
free(fds);
return fd;
}
static int map_fd_by_name(char *name, int **fds)
{
unsigned int id = 0;
int fd, nb_fds = 0;
void *tmp;
int err;
while (true) {
struct bpf_map_info info = {};
__u32 len = sizeof(info);
err = bpf_map_get_next_id(id, &id);
if (err) {
if (errno != ENOENT) {
p_err("%s", strerror(errno));
goto err_close_fds;
}
return nb_fds;
}
fd = bpf_map_get_fd_by_id(id);
if (fd < 0) {
p_err("can't get map by id (%u): %s",
id, strerror(errno));
goto err_close_fds;
}
err = bpf_obj_get_info_by_fd(fd, &info, &len);
if (err) {
p_err("can't get map info (%u): %s",
id, strerror(errno));
goto err_close_fd;
}
if (strncmp(name, info.name, BPF_OBJ_NAME_LEN)) {
close(fd);
continue;
}
if (nb_fds > 0) {
tmp = realloc(*fds, (nb_fds + 1) * sizeof(int));
if (!tmp) {
p_err("failed to realloc");
goto err_close_fd;
}
*fds = tmp;
}
(*fds)[nb_fds++] = fd;
}
err_close_fd:
close(fd);
err_close_fds:
while (--nb_fds >= 0)
close((*fds)[nb_fds]);
return -1;
}
int map_parse_fds(int *argc, char ***argv, int **fds)
{
if (is_prefix(**argv, "id")) {
unsigned int id;
char *endptr;
NEXT_ARGP();
id = strtoul(**argv, &endptr, 0);
if (*endptr) {
p_err("can't parse %s as ID", **argv);
return -1;
}
NEXT_ARGP();
(*fds)[0] = bpf_map_get_fd_by_id(id);
if ((*fds)[0] < 0) {
p_err("get map by id (%u): %s", id, strerror(errno));
return -1;
}
return 1;
} else if (is_prefix(**argv, "name")) {
char *name;
NEXT_ARGP();
name = **argv;
if (strlen(name) > BPF_OBJ_NAME_LEN - 1) {
p_err("can't parse name");
return -1;
}
NEXT_ARGP();
return map_fd_by_name(name, fds);
} else if (is_prefix(**argv, "pinned")) {
char *path;
NEXT_ARGP();
path = **argv;
NEXT_ARGP();
(*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_MAP);
if ((*fds)[0] < 0)
return -1;
return 1;
}
p_err("expected 'id', 'name' or 'pinned', got: '%s'?", **argv);
return -1;
}
int map_parse_fd(int *argc, char ***argv)
{
int *fds = NULL;
int nb_fds, fd;
fds = malloc(sizeof(int));
if (!fds) {
p_err("mem alloc failed");
return -1;
}
nb_fds = map_parse_fds(argc, argv, &fds);
if (nb_fds != 1) {
if (nb_fds > 1) {
p_err("several maps match this handle");
while (nb_fds--)
close(fds[nb_fds]);
}
fd = -1;
goto exit_free;
}
fd = fds[0];
exit_free:
free(fds);
return fd;
}
int map_parse_fd_and_info(int *argc, char ***argv, void *info, __u32 *info_len)
{
int err;
int fd;
fd = map_parse_fd(argc, argv);
if (fd < 0)
return -1;
err = bpf_obj_get_info_by_fd(fd, info, info_len);
if (err) {
p_err("can't get map info: %s", strerror(errno));
close(fd);
return err;
}
return fd;
}
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