Back to index

glibc  2.9
Functions
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 <termios.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdio-common/_itoa.h>
#include <kernel-features.h>

Go to the source code of this file.

Functions

static char * getttyname (const char *dev, dev_t mydev, ino64_t myino, int save, int *dostat) internal_function
 libc_freeres_ptr (static char *getttyname_name)
char * ttyname (int fd)

Function Documentation

static char *internal_function attribute_compat_text_section getttyname ( const char *  dev,
dev_t  mydev,
ino64_t  myino,
int  save,
int dostat 
) [static]

Definition at line 47 of file ttyname.c.

{
  static size_t namelen;
  struct stat64 st;
  DIR *dirstream;
  struct dirent64 *d;
  size_t devlen = strlen (dev) + 1;

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

  while ((d = __readdir64 (dirstream)) != NULL)
    if ((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 (devlen + dlen > namelen)
         {
           free (getttyname_name);
           namelen = 2 * (devlen + 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, devlen - 1)) = '/';
         }
       memcpy (&getttyname_name[devlen], d->d_name, dlen);
       if (__xstat64 (_STAT_VER, getttyname_name, &st) == 0
#ifdef _STATBUF_ST_RDEV
           && S_ISCHR (st.st_mode) && st.st_rdev == mydev
#else
           && d->d_fileno == myino && st.st_dev == mydev
#endif
          )
         {
           (void) __closedir (dirstream);
#if 0
           __ttyname = getttyname_name;
#endif
           __set_errno (save);
           return getttyname_name;
         }
      }

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

Here is the call graph for this function:

Here is the caller graph for this function:

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

Definition at line 114 of file ttyname.c.

{
  static size_t buflen;
  char procname[30];
  struct stat64 st, st1;
  int dostat = 0;
  char *name;
  int save = errno;
  struct termios term;

  /* isatty check, tcgetattr is used because it sets the correct
     errno (EBADF resp. ENOTTY) on error.  */
  if (__builtin_expect (__tcgetattr (fd, &term) < 0, 0))
    return NULL;

  /* We try using the /proc filesystem.  */
  *_fitoa_word (fd, __stpcpy (procname, "/proc/self/fd/"), 10, 0) = '\0';

  if (buflen == 0)
    {
      buflen = 4095;
      ttyname_buf = (char *) malloc (buflen + 1);
      if (ttyname_buf == NULL)
       {
         buflen = 0;
         return NULL;
       }
    }

  ssize_t len = __readlink (procname, ttyname_buf, buflen);
  if (__builtin_expect (len == -1 && errno == ENOENT, 0))
    {
      __set_errno (EBADF);
      return NULL;
    }

  if (__builtin_expect (len != -1
#ifndef __ASSUME_PROC_SELF_FD_SYMLINK
                     /* This is for Linux 2.0.  */
                     && ttyname_buf[0] != '['
#endif
                     , 1))
    {
      if ((size_t) len >= buflen)
       return NULL;
      /* readlink need not terminate the string.  */
      ttyname_buf[len] = '\0';
      return ttyname_buf;
    }

  if (__fxstat64 (_STAT_VER, fd, &st) < 0)
    return NULL;

  if (__xstat64 (_STAT_VER, "/dev/pts", &st1) == 0 && S_ISDIR (st1.st_mode))
    {
#ifdef _STATBUF_ST_RDEV
      name = getttyname ("/dev/pts", st.st_rdev, st.st_ino, save, &dostat);
#else
      name = getttyname ("/dev/pts", st.st_dev, st.st_ino, save, &dostat);
#endif
    }
  else
    {
      __set_errno (save);
      name = NULL;
    }

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

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

  return name;
}

Here is the call graph for this function: