1*6482a961SGreg Kurz /* 2*6482a961SGreg Kurz * 9p utilities 3*6482a961SGreg Kurz * 4*6482a961SGreg Kurz * Copyright IBM, Corp. 2017 5*6482a961SGreg Kurz * 6*6482a961SGreg Kurz * Authors: 7*6482a961SGreg Kurz * Greg Kurz <groug@kaod.org> 8*6482a961SGreg Kurz * 9*6482a961SGreg Kurz * This work is licensed under the terms of the GNU GPL, version 2 or later. 10*6482a961SGreg Kurz * See the COPYING file in the top-level directory. 11*6482a961SGreg Kurz */ 12*6482a961SGreg Kurz 13*6482a961SGreg Kurz #ifndef QEMU_9P_UTIL_H 14*6482a961SGreg Kurz #define QEMU_9P_UTIL_H 15*6482a961SGreg Kurz 16*6482a961SGreg Kurz static inline void close_preserve_errno(int fd) 17*6482a961SGreg Kurz { 18*6482a961SGreg Kurz int serrno = errno; 19*6482a961SGreg Kurz close(fd); 20*6482a961SGreg Kurz errno = serrno; 21*6482a961SGreg Kurz } 22*6482a961SGreg Kurz 23*6482a961SGreg Kurz static inline int openat_dir(int dirfd, const char *name) 24*6482a961SGreg Kurz { 25*6482a961SGreg Kurz return openat(dirfd, name, O_DIRECTORY | O_RDONLY | O_PATH); 26*6482a961SGreg Kurz } 27*6482a961SGreg Kurz 28*6482a961SGreg Kurz static inline int openat_file(int dirfd, const char *name, int flags, 29*6482a961SGreg Kurz mode_t mode) 30*6482a961SGreg Kurz { 31*6482a961SGreg Kurz int fd, serrno, ret; 32*6482a961SGreg Kurz 33*6482a961SGreg Kurz fd = openat(dirfd, name, flags | O_NOFOLLOW | O_NOCTTY | O_NONBLOCK, 34*6482a961SGreg Kurz mode); 35*6482a961SGreg Kurz if (fd == -1) { 36*6482a961SGreg Kurz return -1; 37*6482a961SGreg Kurz } 38*6482a961SGreg Kurz 39*6482a961SGreg Kurz serrno = errno; 40*6482a961SGreg Kurz /* O_NONBLOCK was only needed to open the file. Let's drop it. */ 41*6482a961SGreg Kurz ret = fcntl(fd, F_SETFL, flags); 42*6482a961SGreg Kurz assert(!ret); 43*6482a961SGreg Kurz errno = serrno; 44*6482a961SGreg Kurz return fd; 45*6482a961SGreg Kurz } 46*6482a961SGreg Kurz 47*6482a961SGreg Kurz int relative_openat_nofollow(int dirfd, const char *path, int flags, 48*6482a961SGreg Kurz mode_t mode); 49*6482a961SGreg Kurz 50*6482a961SGreg Kurz #endif 51