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glibc  2.9
Functions
futimes.c File Reference
#include <errno.h>
#include <sysdep.h>
#include <string.h>
#include <time.h>
#include <utime.h>
#include <sys/time.h>
#include <stdio-common/_itoa.h>
#include <fcntl.h>
#include <kernel-features.h>

Go to the source code of this file.

Functions

int __futimes (int fd, const struct timeval tvp[2])

Function Documentation

int __futimes ( int  fd,
const struct timeval  tvp[2] 
)

Definition at line 43 of file futimes.c.

{
  /* The utimensat system call expects timespec not timeval.  */
  struct timespec ts[2];
  if (tvp != NULL)
    {
      if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000
          || tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000)
       {
         __set_errno (EINVAL);
         return -1;
       }

      TIMEVAL_TO_TIMESPEC (&tvp[0], &ts[0]);
      TIMEVAL_TO_TIMESPEC (&tvp[1], &ts[1]);
    }

#ifdef __ASSUME_UTIMENSAT
  return INLINE_SYSCALL (utimensat, 4, fd, NULL, tvp ? &ts : NULL, 0);
#else
  int result;
# ifdef __NR_utimensat
  if (!__builtin_expect (miss_utimensat, 0))
    {
      result = INLINE_SYSCALL (utimensat, 4, fd, NULL, tvp ? &ts : NULL, 0);
      if (__builtin_expect (result, 0) != -1 || errno != ENOSYS)
       return result;

      miss_utimensat = 1;
    }
# endif

  static const char selffd[] = "/proc/self/fd/";
  char fname[sizeof (selffd) + 3 * sizeof (int)];
  fname[sizeof (fname) - 1] = '\0';
  char *cp = _itoa_word ((unsigned int) fd, fname + sizeof (fname) - 1, 10, 0);
  cp = memcpy (cp - sizeof (selffd) + 1, selffd, sizeof (selffd) - 1);

# ifdef __NR_utimes
  result = INLINE_SYSCALL (utimes, 2, cp, tvp);
#  ifndef __ASSUME_UTIMES
  if (result == -1 && errno == ENOSYS)
#  endif
# endif
    {
      /* The utimes() syscall does not exist or is not available in the
        used kernel.  Use utime().  For this we have to convert to the
        data format utime() expects.  */
# ifndef __ASSUME_UTIMES
      struct utimbuf buf;
      struct utimbuf *times;

      if (tvp != NULL)
       {
         times = &buf;
         buf.actime = tvp[0].tv_sec + (tvp[0].tv_usec + 500000) / 1000000;
         buf.modtime = tvp[1].tv_sec + (tvp[1].tv_usec + 500000) / 1000000;
       }
      else
       times = NULL;

      result = INLINE_SYSCALL (utime, 2, cp, times);
# endif
    }

  if (result == -1)
    /* Check for errors that result from failing to find /proc.
       This means we can't do futimes at all, so return ENOSYS
       rather than some confusing error.  */
    switch (errno)
      {
      case EACCES:
       if (tvp == NULL)  /* Could be a path problem or a file problem.  */
         break;
       /*FALLTHROUGH*/
      case ELOOP:
      case ENAMETOOLONG:
      case ENOTDIR:
       __set_errno (ENOSYS);
       break;

      case ENOENT:
       /* Validate the file descriptor by letting fcntl set errno to
          EBADF if it's bogus.  Otherwise it's a /proc issue.  */
# if !defined __NR_fcntl && defined __NR_fcntl64
#  define __NR_fcntl __NR_fcntl64
# endif
       if (INLINE_SYSCALL (fcntl, 3, fd, F_GETFD, 0) != -1)
         __set_errno (ENOSYS);
       break;
      }

  return result;
#endif
}

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