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/*
* 9p utilities
*
* Copyright IBM, Corp. 2017
*
* Authors:
* Greg Kurz <groug@kaod.org>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu/xattr.h"
#include "9p-util.h"
int relative_openat_nofollow(int dirfd, const char *path, int flags,
mode_t mode)
{
int fd;
fd = dup(dirfd);
if (fd == -1) {
return -1;
}
while (*path) {
const char *c;
int next_fd;
char *head;
/* Only relative paths without consecutive slashes */
assert(path[0] != '/');
head = g_strdup(path);
c = strchr(path, '/');
if (c) {
head[c - path] = 0;
next_fd = openat_dir(fd, head);
} else {
next_fd = openat_file(fd, head, flags, mode);
}
g_free(head);
if (next_fd == -1) {
close_preserve_errno(fd);
return -1;
}
close(fd);
fd = next_fd;
if (!c) {
break;
}
path = c + 1;
}
return fd;
}
ssize_t fgetxattrat_nofollow(int dirfd, const char *filename, const char *name,
void *value, size_t size)
{
char *proc_path = g_strdup_printf("/proc/self/fd/%d/%s", dirfd, filename);
int ret;
ret = lgetxattr(proc_path, name, value, size);
g_free(proc_path);
return ret;
}
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