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1097c6030a
* mach/Makefile: Use -include for mach-syscalls.mk to silence warning. * sysdeps/mach/hurd/sysd-stdio.c: Declare fns __stdio_{read,write,seek,close,fileno} using __io_*_fn types. * sysdeps/generic/sysd-stdio.c: Likewise.
192 lines
4.4 KiB
C
192 lines
4.4 KiB
C
/* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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extern __io_read_fn __stdio_read;
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extern __io_write_fn __stdio_write;
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extern __io_seek_fn __stdio_seek;
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extern __io_close_fn __stdio_close;
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extern __io_fileno_fn __stdio_fileno;
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/* Read N bytes into BUF from COOKIE. */
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int
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__stdio_read (void *cookie, char *buf, size_t n)
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{
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const int fd = (int) cookie;
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#if defined EINTR && defined EINTR_REPEAT
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int save = errno;
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int nread;
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try:;
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__set_errno (0);
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nread = __read (fd, buf, (int) n);
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if (nread < 0)
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{
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if (errno == EINTR)
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goto try;
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return -1;
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}
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__set_errno (save);
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return nread;
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#else /* No EINTR. */
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return __read (fd, buf, n);
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#endif
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}
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/* Write N bytes from BUF to COOKIE. */
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int
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__stdio_write (void *cookie, const char *buf, size_t n)
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{
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const int fd = (int) cookie;
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register size_t written = 0;
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while (n > 0)
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{
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int count = __write (fd, buf, (int) n);
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if (count > 0)
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{
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buf += count;
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written += count;
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n -= count;
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}
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else if (count < 0
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#if defined EINTR && defined EINTR_REPEAT
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&& errno != EINTR
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#endif
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)
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/* Write error. */
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return -1;
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}
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return (int) written;
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}
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/* Move COOKIE's file position *POS bytes, according to WHENCE.
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The new file position is stored in *POS.
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Returns zero if successful, nonzero if not. */
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int
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__stdio_seek (void *cookie, fpos_t *pos, int whence)
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{
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off_t new;
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new = __lseek ((int) cookie, (off_t) *pos, whence);
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if (new < 0)
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return 1;
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*pos = (fpos_t) new;
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return 0;
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}
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/* Close COOKIE. */
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int
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__stdio_close (void *cookie)
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{
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return __close ((int) cookie);
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}
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/* Return the POSIX.1 file descriptor associated with COOKIE,
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or -1 for errors. If COOKIE does not relate to any POSIX.1 file
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descriptor, this should return -1 with errno set to EOPNOTSUPP. */
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int
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__stdio_fileno (void *cookie)
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{
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return (int) cookie;
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}
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/* Open the given file with the mode given in the __io_mode argument. */
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int
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__stdio_open (const char *filename, __io_mode m, void **cookieptr)
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{
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int fd;
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int mode;
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if (m.__read && m.__write)
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mode = O_RDWR;
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else
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mode = m.__read ? O_RDONLY : O_WRONLY;
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if (m.__append)
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mode |= O_APPEND;
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if (m.__exclusive)
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mode |= O_EXCL;
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if (m.__truncate)
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mode |= O_TRUNC;
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if (m.__create)
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fd = __open (filename, mode | O_CREAT,
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S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);
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else
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fd = __open (filename, mode);
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if (fd < 0)
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return -1;
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*cookieptr = (void *) fd;
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return 0;
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}
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/* Open FILENAME with the mode in M. Use the same magic cookie
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already in *COOKIEPTR if possible, closing the old cookie with CLOSEFN. */
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int
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__stdio_reopen (const char *filename, __io_mode m, void **cookieptr,
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__io_close_fn closefn)
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{
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void *newcookie;
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/* We leave the old descriptor open while we open the file.
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That way ``freopen ("/dev/stdin", "r", stdin)'' works. */
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if (__stdio_open (filename, m, &newcookie))
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{
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if (errno == ENFILE || errno == EMFILE)
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{
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/* We are out of file descriptors. Try closing the old one and
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retrying the open. */
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(void) (*closefn) (*cookieptr);
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if (__stdio_open (filename, m, &newcookie))
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return -1;
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}
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else
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return -1;
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}
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if (newcookie != *cookieptr)
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{
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if (closefn != __stdio_close ||
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/* Try to move the descriptor to the desired one. */
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__dup2 ((int) newcookie, (int) *cookieptr) < 0)
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/* Didn't work. Give the caller the new cookie. */
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*cookieptr = newcookie;
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}
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return 0;
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}
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