1 /* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
24 #include <sys/types.h>
29 /* Read N bytes into BUF from COOKIE. */
31 __stdio_read (void *cookie, char *buf, size_t n;)
33 const int fd = (int) cookie;
34 #if defined (EINTR) && defined (EINTR_REPEAT)
40 nread = __read (fd, buf, (int) n);
51 return __read (fd, buf, n);
56 /* Write N bytes from BUF to COOKIE. */
58 __stdio_write (void *cookie, const char *buf, size_t n)
60 const int fd = (int) cookie;
61 register size_t written = 0;
65 int count = __write (fd, buf, (int) n);
73 #if defined (EINTR) && defined (EINTR_REPEAT)
85 /* Move COOKIE's file position *POS bytes, according to WHENCE.
86 The new file position is stored in *POS.
87 Returns zero if successful, nonzero if not. */
89 __stdio_seek (void *cookie, fpos_t *pos, int whence)
92 new = __lseek ((int) cookie, (off_t) *pos, whence);
102 __stdio_close (void *cookie)
104 return __close ((int) cookie);
107 /* Return the POSIX.1 file descriptor associated with COOKIE,
108 or -1 for errors. If COOKIE does not relate to any POSIX.1 file
109 descriptor, this should return -1 with errno set to EOPNOTSUPP. */
111 __stdio_fileno (void *cookie)
117 /* Open the given file with the mode given in the __io_mode argument. */
119 __stdio_open (const char *filename, __io_mode m, void **cookieptr)
124 if (m.__read && m.__write)
127 mode = m.__read ? O_RDONLY : O_WRONLY;
137 fd = __open (filename, mode | O_CREAT,
138 S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);
140 fd = __open (filename, mode);
145 *cookieptr = (void *) fd;
150 /* Open FILENAME with the mode in M. Use the same magic cookie
151 already in *COOKIEPTR if possible, closing the old cookie with CLOSEFN. */
153 __stdio_reopen (const char *filename, __io_mode m, void **cookieptr,
154 __io_close_fn closefn)
158 /* We leave the old descriptor open while we open the file.
159 That way ``freopen ("/dev/stdin", "r", stdin)'' works. */
161 if (__stdio_open (filename, m, &newcookie))
163 if (errno == ENFILE || errno == EMFILE)
165 /* We are out of file descriptors. Try closing the old one and
166 retrying the open. */
167 (void) (*closefn) (*cookieptr);
168 if (__stdio_open (filename, m, &newcookie))
175 if (newcookie != *cookieptr)
177 if (closefn != __stdio_close ||
178 /* Try to move the descriptor to the desired one. */
179 __dup2 ((int) newcookie, (int) *cookieptr) < 0)
180 /* Didn't work. Give the caller the new cookie. */
181 *cookieptr = newcookie;