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glibc  2.9
Functions | Variables
ttyname.c File Reference
#include <errno.h>
#include <limits.h>
#include <stddef.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>

Go to the source code of this file.

Functions

static char * getttyname (int fd, dev_t mydev, ino_t myino, int save, int *dostat) internal_function
 libc_freeres_ptr (static char *getttyname_name)
char * ttyname (int fd)

Variables

char * __ttyname

Function Documentation

static char *internal_function getttyname ( int  fd,
dev_t  mydev,
ino_t  myino,
int  save,
int dostat 
) [static]

Definition at line 39 of file ttyname.c.

{
  static const char dev[] = "/dev";
  static size_t namelen;
  struct stat st;
  DIR *dirstream;
  struct dirent *d;

  dirstream = __opendir (dev);
  if (dirstream == NULL)
    {
      *dostat = -1;
      return NULL;
    }

  while ((d = __readdir (dirstream)) != NULL)
    if (((ino_t) d->d_fileno == myino || *dostat)
       && strcmp (d->d_name, "stdin")
       && strcmp (d->d_name, "stdout")
       && strcmp (d->d_name, "stderr"))
      {
       size_t dlen = _D_ALLOC_NAMLEN (d);
       if (sizeof (dev) + dlen > namelen)
         {
           free (getttyname_name);
           namelen = 2 * (sizeof (dev) + dlen); /* Big enough.  */
           getttyname_name = malloc (namelen);
           if (! getttyname_name)
             {
              *dostat = -1;
              /* Perhaps it helps to free the directory stream buffer.  */
              (void) __closedir (dirstream);
              return NULL;
             }
           *((char *) __mempcpy (getttyname_name, dev, sizeof (dev) - 1))
             = '/';
         }
       (void) __mempcpy (&getttyname_name[sizeof (dev)], d->d_name, dlen);
       if (stat (getttyname_name, &st) == 0
#ifdef _STATBUF_ST_RDEV
           && S_ISCHR (st.st_mode) && st.st_rdev == mydev
#else
           && (ino_t) d->d_fileno == myino && st.st_dev == mydev
#endif
          )
         {
           (void) __closedir (dirstream);
           __ttyname = getttyname_name;
           __set_errno (save);
           return getttyname_name;
         }
      }

  (void) __closedir (dirstream);
  __set_errno (save);
  return NULL;
}

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libc_freeres_ptr ( static char *  getttyname_name)
char* ttyname ( int  fd)

Definition at line 105 of file ttyname.c.

{
  struct stat st;
  int dostat = 0;
  char *name;
  int save = errno;

  if (!__isatty (fd))
    return NULL;

  if (fstat (fd, &st) < 0)
    return NULL;

#ifdef _STATBUF_ST_RDEV
  name = getttyname (fd, st.st_rdev, st.st_ino, save, &dostat);
#else
  name = getttyname (fd, st.st_dev, st.st_ino, save, &dostat);
#endif

  if (!name && dostat != -1)
    {
      dostat = 1;
#ifdef _STATBUF_ST_RDEV
      name = getttyname (fd, st.st_rdev, st.st_ino, save, &dostat);
#else
      name = getttyname (fd, st.st_dev, st.st_ino, save, &dostat);
#endif
    }

  return name;
}

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Variable Documentation

char* __ttyname

Definition at line 29 of file ttyname.c.