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/*
* fsync.cc: Part of GNU CSSC.
*
* Copyright (C) 1997, Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*
* CSSC was originally Based on MySC, by Ross Ridge, which was
* placed in the Public Domain.
*
*
* Defines the function fsync for MS-DOS systems.
*
*/
#ifndef CSSC__FSYNC_H__
#define CSSC__FSYNC_H___
#ifndef CONFIG_DJGPP
struct check_msdos_version {
check_msdos_version();
};
check_msdos_version::check_msdos_version() {
if (_osmajor < 2 || (_osmajor == 3 && _osminor < 3)) {
static const char msg[] = "MS-DOS version 3.3 or later"
" required.\r\n";
_write(2, msg, sizeof(msg));
}
}
static class check_msdos_version check_msdos_version;
#endif
#define fsync LIDENT(fsync)
/* Updates the files contents and most importantly the file's directory
entry on to disk. */
static int
fsync(int fd) {
#ifdef __BORLANDC__
asm mov bx, fd;
asm mov ah, 0x68;
asm int 21h;
asm jnc ok;
asm mov errno, ax;
return -1;
ok:
return 0;
#else /* __BORLANDC__ */
#ifdef __GNUC__
char ret;
short err;
asm volatile ("movb $0x68, %%ah;"
"int $0x21;"
"setb %0;"
: "=g" (ret), "=a" (err) /* output */
: "b" ((short) fd) /* input */
: "cc", "%ebx", "%ecx", "%edx", "%esi", "%edi");
if (ret) {
errno = err;
return -1;
}
return 0;
#else /* __GNUC__ */
union REGS regs;
regs.x.bx = (short) fd;
regs.h.ah = 0x68;
intdos(®s, ®s);
if (regs.x.cflag) {
errno = regs.x.ax;
return -1;
}
return 0;
#endif /* __GNUC__ */
#endif /* __BORLANDC__ */
}
#endif /* __FSYNC_H__ */
/* Local variables: */
/* mode: c++ */
/* End: */
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