hw/9pfs/9p-util-darwin.c

   1 /*
   2  * 9p utilities (Darwin Implementation)
   3  *
   4  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   5  * See the COPYING file in the top-level directory.
   6  */
   7
   8 #include "qemu/osdep.h"
   9 #include "qemu/xattr.h"
  10 #include "qapi/error.h"
  11 #include "qemu/error-report.h"
  12 #include "9p-util.h"
  13
  14 ssize_t fgetxattrat_nofollow(int dirfd, const char *filename, const char *name,
  15                              void *value, size_t size)
  16 {
  17     int ret;
  18     int fd = openat_file(dirfd, filename,
  19                          O_RDONLY | O_PATH_9P_UTIL | O_NOFOLLOW, 0);
  20     if (fd == -1) {
  21         return -1;
  22     }
  23     ret = fgetxattr(fd, name, value, size, 0, 0);
  24     close_preserve_errno(fd);
  25     return ret;
  26 }
  27
  28 ssize_t flistxattrat_nofollow(int dirfd, const char *filename,
  29                               char *list, size_t size)
  30 {
  31     int ret;
  32     int fd = openat_file(dirfd, filename,
  33                          O_RDONLY | O_PATH_9P_UTIL | O_NOFOLLOW, 0);
  34     if (fd == -1) {
  35         return -1;
  36     }
  37     ret = flistxattr(fd, list, size, 0);
  38     close_preserve_errno(fd);
  39     return ret;
  40 }
  41
  42 ssize_t fremovexattrat_nofollow(int dirfd, const char *filename,
  43                                 const char *name)
  44 {
  45     int ret;
  46     int fd = openat_file(dirfd, filename, O_PATH_9P_UTIL | O_NOFOLLOW, 0);
  47     if (fd == -1) {
  48         return -1;
  49     }
  50     ret = fremovexattr(fd, name, 0);
  51     close_preserve_errno(fd);
  52     return ret;
  53 }
  54
  55 int fsetxattrat_nofollow(int dirfd, const char *filename, const char *name,
  56                          void *value, size_t size, int flags)
  57 {
  58     int ret;
  59     int fd = openat_file(dirfd, filename, O_PATH_9P_UTIL | O_NOFOLLOW, 0);
  60     if (fd == -1) {
  61         return -1;
  62     }
  63     ret = fsetxattr(fd, name, value, size, 0, flags);
  64     close_preserve_errno(fd);
  65     return ret;
  66 }
  67
  68 /*
  69  * As long as mknodat is not available on macOS, this workaround
  70  * using pthread_fchdir_np is needed.
  71  *
  72  * Radar filed with Apple for implementing mknodat:
  73  * rdar://FB9862426 (https://openradar.appspot.com/FB9862426)
  74  */
  75 #if defined CONFIG_PTHREAD_FCHDIR_NP
  76
  77 int qemu_mknodat(int dirfd, const char *filename, mode_t mode, dev_t dev)
  78 {
  79     int preserved_errno, err;
  80     if (!pthread_fchdir_np) {
  81         error_report_once("pthread_fchdir_np() not available on this version of macOS");
  82         return -ENOTSUP;
  83     }
  84     if (pthread_fchdir_np(dirfd) < 0) {
  85         return -1;
  86     }
  87     err = mknod(filename, mode, dev);
  88     preserved_errno = errno;
  89     /* Stop using the thread-local cwd */
  90     pthread_fchdir_np(-1);
  91     if (err < 0) {
  92         errno = preserved_errno;
  93     }
  94     return err;
  95 }
  96
  97 #endif