| /* |
| * 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. |
| */ |
| |
| #ifndef QEMU_9P_UTIL_H |
| #define QEMU_9P_UTIL_H |
| |
| static inline void close_preserve_errno(int fd) |
| { |
| int serrno = errno; |
| close(fd); |
| errno = serrno; |
| } |
| |
| static inline int openat_dir(int dirfd, const char *name) |
| { |
| #ifdef O_PATH |
| #define OPENAT_DIR_O_PATH O_PATH |
| #else |
| #define OPENAT_DIR_O_PATH 0 |
| #endif |
| return openat(dirfd, name, |
| O_DIRECTORY | O_RDONLY | O_NOFOLLOW | OPENAT_DIR_O_PATH); |
| } |
| |
| static inline int openat_file(int dirfd, const char *name, int flags, |
| mode_t mode) |
| { |
| int fd, serrno, ret; |
| |
| fd = openat(dirfd, name, flags | O_NOFOLLOW | O_NOCTTY | O_NONBLOCK, |
| mode); |
| if (fd == -1) { |
| return -1; |
| } |
| |
| serrno = errno; |
| /* O_NONBLOCK was only needed to open the file. Let's drop it. */ |
| ret = fcntl(fd, F_SETFL, flags); |
| assert(!ret); |
| errno = serrno; |
| return fd; |
| } |
| |
| ssize_t fgetxattrat_nofollow(int dirfd, const char *path, const char *name, |
| void *value, size_t size); |
| int fsetxattrat_nofollow(int dirfd, const char *path, const char *name, |
| void *value, size_t size, int flags); |
| |
| #endif |