minix/lib/libc/sys/utimensat.c

   1 #include <sys/cdefs.h>
   2 #include "namespace.h"
   3 #include <lib.h>
   4
   5 #include <sys/stat.h>
   6 #include <fcntl.h>
   7 #include <string.h>
   8 #include <limits.h>
   9 #include <errno.h>
  10
  11 /* Implement a very large but not complete subset of the utimensat()
  12  * Posix:2008/XOpen-7 function.
  13  * Are handled the following cases:
  14  * . utimensat(AT_FDCWD, "/some/absolute/path", , )
  15  * . utimensat(AT_FDCWD, "some/path", , )
  16  * . utimensat(fd, "/some/absolute/path", , ) although fd is useless here
  17  * Are not handled the following cases:
  18  * . utimensat(fd, "some/path", , ) path to a file relative to some open fd
  19  */
  20 int utimensat(int fd, const char *name, const struct timespec tv[2],
  21     int flags)
  22 {
  23   message m;
  24   static const struct timespec now[2] = { {0, UTIME_NOW}, {0, UTIME_NOW} };
  25
  26   if (tv == NULL) tv = now;
  27
  28   if (name == NULL) {
  29         errno = EINVAL;
  30         return -1;
  31   }
  32   if (name[0] == '\0') { /* POSIX requirement */
  33         errno = ENOENT;
  34         return -1;
  35   }
  36   if (fd != AT_FDCWD && name[0] != '/') { /* Not supported */
  37         errno = EINVAL;
  38         return -1;
  39   }
  40
  41   if ((unsigned)flags > SHRT_MAX) {
  42         errno = EINVAL;
  43         return -1;
  44   }
  45
  46   memset(&m, 0, sizeof(m));
  47   m.m_vfs_utimens.len = strlen(name) + 1;
  48   m.m_vfs_utimens.name = __UNCONST(name);
  49   m.m_vfs_utimens.atime = tv[0].tv_sec;
  50   m.m_vfs_utimens.mtime = tv[1].tv_sec;
  51   m.m_vfs_utimens.ansec = tv[0].tv_nsec;
  52   m.m_vfs_utimens.mnsec = tv[1].tv_nsec;
  53   m.m_vfs_utimens.flags = flags;
  54
  55   return(_syscall(VFS_PROC_NR, VFS_UTIMENS, &m));
  56 }