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newlib/winsup/cygwin/fhandler.cc

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/* fhandler.cc. See console.cc for fhandler_console functions.
Copyright 1996, 1997, 1998, 1999, 2000, 2001 Red Hat, Inc.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include <sys/fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/cygwin.h>
#include <signal.h>
#include "cygerrno.h"
#include "perprocess.h"
#include "security.h"
#include "cygwin/version.h"
#include "fhandler.h"
#include "path.h"
#include "dtable.h"
#include "cygheap.h"
#include "shared_info.h"
#include "sigproc.h"
#include "pinfo.h"
#include <assert.h>
static NO_COPY const int CHUNK_SIZE = 1024; /* Used for crlf conversions */
struct __cygwin_perfile *perfile_table;
DWORD binmode;
inline fhandler_base&
fhandler_base::operator =(fhandler_base &x)
{
memcpy (this, &x, sizeof *this);
unix_path_name = x.unix_path_name ? cstrdup (x.unix_path_name) : NULL;
win32_path_name = x.win32_path_name ? cstrdup (x.win32_path_name) : NULL;
rabuf = NULL;
ralen = 0;
raixget = 0;
raixput = 0;
rabuflen = 0;
return *this;
}
int
fhandler_base::puts_readahead (const char *s, size_t len = (size_t) -1)
{
int success = 1;
while ((*s || (len != (size_t) -1 && len--))
&& (success = put_readahead (*s++) > 0))
continue;
return success;
}
int
fhandler_base::put_readahead (char value)
{
char *newrabuf;
if (raixput < rabuflen)
/* Nothing to do */;
else if ((newrabuf = (char *) realloc (rabuf, rabuflen += 32)))
rabuf = newrabuf;
else
return 0;
rabuf[raixput++] = value;
ralen++;
return 1;
}
int
fhandler_base::get_readahead ()
{
int chret = -1;
if (raixget < ralen)
chret = ((unsigned char) rabuf[raixget++]) & 0xff;
/* FIXME - not thread safe */
if (raixget >= ralen)
raixget = raixput = ralen = 0;
return chret;
}
int
fhandler_base::peek_readahead (int queryput)
{
int chret = -1;
if (!queryput && raixget < ralen)
chret = ((unsigned char) rabuf[raixget]) & 0xff;
else if (queryput && raixput > 0)
chret = ((unsigned char) rabuf[raixput - 1]) & 0xff;
return chret;
}
void
fhandler_base::set_readahead_valid (int val, int ch = -1)
{
if (!val)
ralen = raixget = raixput = 0;
if (ch != -1)
put_readahead(ch);
}
int
fhandler_base::eat_readahead (int n)
{
int oralen = ralen;
if (n < 0)
n = ralen;
if (n > 0 && ralen)
{
if ((int) (ralen -= n) < 0)
ralen = 0;
if (raixget >= ralen)
raixget = raixput = ralen = 0;
else if (raixput > ralen)
raixput = ralen;
}
return oralen;
}
int
fhandler_base::get_readahead_into_buffer (char *buf, size_t buflen)
{
int ch;
int copied_chars = 0;
while (buflen)
if ((ch = get_readahead ()) < 0)
break;
else
{
buf[copied_chars++] = (unsigned char)(ch & 0xff);
buflen--;
}
return copied_chars;
}
/* Record the file name.
Filenames are used mostly for debugging messages, and it's hoped that
in cases where the name is really required, the filename wouldn't ever
be too long (e.g. devices or some such). */
void
fhandler_base::set_name (const char *unix_path, const char *win32_path, int unit)
{
if (unix_path == NULL || !*unix_path)
return;
if (win32_path)
win32_path_name = cstrdup (win32_path);
else
{
const char *fmt = get_native_name ();
win32_path_name = (char *) cmalloc (HEAP_STR, strlen(fmt) + 16);
__small_sprintf (win32_path_name, fmt, unit);
}
if (win32_path_name == NULL)
{
system_printf ("fatal error. strdup failed");
exit (ENOMEM);
}
assert (unix_path_name == NULL);
/* FIXME: This isn't really right. It ignores the first argument if we're
building names for a device and just converts the device name from the
win32 name since it has theoretically been previously detected by
path_conv. Ideally, we should pass in a format string and build the
unix_path, too. */
if (!is_device () || *win32_path_name != '\\')
unix_path_name = cstrdup (unix_path);
else
{
unix_path_name = cstrdup (win32_path_name);
for (char *p = unix_path_name; (p = strchr (p, '\\')); p++)
*p = '/';
}
if (unix_path_name == NULL)
{
system_printf ("fatal error. strdup failed");
exit (ENOMEM);
}
namehash = hash_path_name (0, win32_path_name);
}
void
fhandler_base::reset_unix_path_name (const char *unix_path)
{
cfree (unix_path_name);
unix_path_name = cstrdup (unix_path);
}
/* Detect if we are sitting at EOF for conditions where Windows
returns an error but UNIX doesn't. */
static int __stdcall
is_at_eof (HANDLE h, DWORD err)
{
DWORD size, upper1, curr;
size = GetFileSize (h, &upper1);
if (upper1 != 0xffffffff || GetLastError () == NO_ERROR)
{
LONG upper2 = 0;
curr = SetFilePointer (h, 0, &upper2, FILE_CURRENT);
if (curr == size && upper1 == (DWORD) upper2)
return 1;
}
SetLastError (err);
return 0;
}
/* Normal file i/o handlers. */
/* Cover function to ReadFile to achieve (as much as possible) Posix style
semantics and use of errno. */
int
fhandler_base::raw_read (void *ptr, size_t ulen)
{
DWORD bytes_read;
if (!ReadFile (get_handle(), ptr, ulen, &bytes_read, 0))
{
int errcode;
/* Some errors are not really errors. Detect such cases here. */
errcode = GetLastError ();
switch (errcode)
{
case ERROR_BROKEN_PIPE:
/* This is really EOF. */
bytes_read = 0;
break;
case ERROR_MORE_DATA:
/* `bytes_read' is supposedly valid. */
break;
case ERROR_NOACCESS:
if (is_at_eof (get_handle (), errcode))
return 0;
case ERROR_INVALID_FUNCTION:
case ERROR_INVALID_PARAMETER:
if (openflags & O_DIROPEN)
{
set_errno (EISDIR);
return -1;
}
default:
syscall_printf ("ReadFile %s failed, %E", unix_path_name);
__seterrno_from_win_error (errcode);
return -1;
break;
}
}
return bytes_read;
}
/* Cover function to WriteFile to provide Posix interface and semantics
(as much as possible). */
int
fhandler_base::raw_write (const void *ptr, size_t len)
{
DWORD bytes_written;
if (!WriteFile (get_handle(), ptr, len, &bytes_written, 0))
{
if (GetLastError () == ERROR_DISK_FULL && bytes_written > 0)
return bytes_written;
__seterrno ();
if (get_errno () == EPIPE)
raise (SIGPIPE);
return -1;
}
return bytes_written;
}
#define ACCFLAGS(x) (x & (O_RDONLY | O_WRONLY | O_RDWR))
int
fhandler_base::get_default_fmode (int flags)
{
if (perfile_table)
{
size_t nlen = strlen (get_name ());
unsigned accflags = ACCFLAGS (flags);
for (__cygwin_perfile *pf = perfile_table; pf->name; pf++)
if (!*pf->name && ACCFLAGS (pf->flags) == accflags)
return pf->flags & ~(O_RDONLY | O_WRONLY | O_RDWR);
else
{
size_t pflen = strlen (pf->name);
const char *stem = get_name () + nlen - pflen;
if (pflen > nlen || (stem != get_name () && !isdirsep (stem[-1])))
continue;
else if (ACCFLAGS (pf->flags) == accflags && strcasematch (stem, pf->name))
return pf->flags & ~(O_RDONLY | O_WRONLY | O_RDWR);
}
}
return __fmode;
}
/* Open system call handler function. */
int
fhandler_base::open (path_conv *, int flags, mode_t mode)
{
int res = 0;
HANDLE x;
int file_attributes;
int shared;
int creation_distribution;
SECURITY_ATTRIBUTES sa = sec_none;
syscall_printf ("(%s, %p)", get_win32_name (), flags);
if (get_win32_name () == NULL)
{
set_errno (ENOENT);
goto done;
}
if (get_query_open ())
access = 0;
else if (get_device () == FH_TAPE)
access = GENERIC_READ | GENERIC_WRITE;
else if ((flags & (O_RDONLY | O_WRONLY | O_RDWR)) == O_RDONLY)
access = GENERIC_READ;
else if ((flags & (O_RDONLY | O_WRONLY | O_RDWR)) == O_WRONLY)
access = GENERIC_WRITE;
else
access = GENERIC_READ | GENERIC_WRITE;
/* Allow reliable lseek on disk devices. */
if (get_device () == FH_FLOPPY)
access |= GENERIC_READ;
/* FIXME: O_EXCL handling? */
if ((flags & O_TRUNC) && ((flags & O_ACCMODE) != O_RDONLY))
{
if (flags & O_CREAT)
creation_distribution = CREATE_ALWAYS;
else
creation_distribution = TRUNCATE_EXISTING;
}
else if (flags & O_CREAT)
creation_distribution = OPEN_ALWAYS;
else
creation_distribution = OPEN_EXISTING;
if ((flags & O_EXCL) && (flags & O_CREAT))
creation_distribution = CREATE_NEW;
if (flags & O_APPEND)
set_append_p();
/* These flags are host dependent. */
shared = wincap.shared ();
file_attributes = FILE_ATTRIBUTE_NORMAL;
if (flags & O_DIROPEN)
file_attributes |= FILE_FLAG_BACKUP_SEMANTICS;
if (get_device () == FH_SERIAL)
file_attributes |= FILE_FLAG_OVERLAPPED;
#ifdef HIDDEN_DOT_FILES
if (flags & O_CREAT && get_device () == FH_DISK)
{
char *c = strrchr (get_win32_name (), '\\');
if ((c && c[1] == '.') || *get_win32_name () == '.')
file_attributes |= FILE_ATTRIBUTE_HIDDEN;
}
#endif
/* CreateFile() with dwDesiredAccess == 0 when called on remote
share returns some handle, even if file doesn't exist. This code
works around this bug. */
if (get_query_open () &&
isremote () &&
creation_distribution == OPEN_EXISTING &&
GetFileAttributes (get_win32_name ()) == (DWORD) -1)
{
set_errno (ENOENT);
goto done;
}
/* If the file should actually be created and ntsec is on,
set files attributes. */
if (flags & O_CREAT && get_device () == FH_DISK && allow_ntsec && has_acls ())
set_security_attribute (mode, &sa, alloca (4096), 4096);
x = CreateFile (get_win32_name (), access, shared, &sa, creation_distribution,
file_attributes, 0);
syscall_printf ("%p = CreateFileA (%s, %p, %p, %p, %p, %p, 0)",
x, get_win32_name (), access, shared, &sa,
creation_distribution, file_attributes);
if (x == INVALID_HANDLE_VALUE)
{
if (GetLastError () == ERROR_INVALID_HANDLE)
set_errno (ENOENT);
else
__seterrno ();
goto done;
}
/* Attributes may be set only if a file is _really_ created.
This code is now only used for ntea here since the files
security attributes are set in CreateFile () now. */
if (flags & O_CREAT && get_device () == FH_DISK
&& GetLastError () != ERROR_ALREADY_EXISTS
&& !allow_ntsec && allow_ntea)
set_file_attribute (has_acls (), get_win32_name (), mode);
set_io_handle (x);
int bin;
int fmode;
if ((bin = flags & (O_BINARY | O_TEXT)))
/* nothing to do */;
else if ((fmode = get_default_fmode (flags)) & O_BINARY)
bin = O_BINARY;
else if (fmode & O_TEXT)
bin = O_TEXT;
else if (get_device () == FH_DISK)
bin = get_w_binary () || get_r_binary ();
else
bin = (binmode == O_BINARY) || get_w_binary () || get_r_binary ();
if (bin & O_TEXT)
bin = 0;
set_flags (flags | (bin ? O_BINARY : O_TEXT));
set_r_binary (bin);
set_w_binary (bin);
syscall_printf ("filemode set to %s", bin ? "binary" : "text");
if (get_device () != FH_TAPE
&& get_device () != FH_FLOPPY
&& get_device () != FH_SERIAL)
{
if (flags & O_APPEND)
SetFilePointer (get_handle(), 0, 0, FILE_END);
else
SetFilePointer (get_handle(), 0, 0, FILE_BEGIN);
}
res = 1;
set_open_status ();
done:
syscall_printf ("%d = fhandler_base::open (%s, %p)", res, get_win32_name (),
flags);
return res;
}
/* states:
open buffer in binary mode? Just do the read.
open buffer in text mode? Scan buffer for control zs and handle
the first one found. Then scan buffer, converting every \r\n into
an \n. If last char is an \r, look ahead one more char, if \n then
modify \r, if not, remember char.
*/
int
fhandler_base::read (void *in_ptr, size_t in_len)
{
int len = (int) in_len;
char *ptr = (char *) in_ptr;
int c;
int copied_chars = 0;
while (len)
if ((c = get_readahead ()) < 0)
break;
else
{
ptr[copied_chars++] = (unsigned char) (c & 0xff);
len--;
}
if (copied_chars && is_slow ())
return copied_chars;
if (len)
{
int readlen = raw_read (ptr + copied_chars, len);
if (copied_chars == 0)
copied_chars = readlen; /* Propagate error or EOF */
else if (readlen > 0) /* FIXME: should flag EOF for next read */
copied_chars += readlen;
}
if (copied_chars <= 0)
return copied_chars;
if (get_r_binary ())
{
debug_printf ("returning %d chars, binary mode", copied_chars);
return copied_chars;
}
#if 0
char *ctrlzpos;
/* Scan buffer for a control-z and shorten the buffer to that length */
ctrlzpos = (char *) memchr ((char *) ptr, 0x1a, copied_chars);
if (ctrlzpos)
{
lseek ((ctrlzpos - ((char *) ptr + copied_chars)), SEEK_CUR);
copied_chars = ctrlzpos - (char *) ptr;
}
if (copied_chars == 0)
{
debug_printf ("returning 0 chars, text mode, CTRL-Z found");
return 0;
}
#endif
/* Scan buffer and turn \r\n into \n */
register char *src = (char *) ptr;
register char *dst = (char *) ptr;
register char *end = src + copied_chars - 1;
/* Read up to the last but one char - the last char needs special handling */
while (src < end)
{
*dst = *src++;
if (*dst != '\r' || *src != '\n')
dst++;
}
c = *src;
/* if last char is a '\r' then read one more to see if we should
translate this one too */
if (c == '\r')
{
char c1 = 0;
len = raw_read (&c1, 1);
if (len <= 0)
/* nothing */;
else if (c1 == '\n')
c = '\n';
else
set_readahead_valid (1, c1);
}
*dst++ = c;
copied_chars = dst - (char *) ptr;
#ifndef NOSTRACE
if (strace.active)
{
char buf[16 * 6 + 1];
char *p = buf;
for (int i = 0; i < copied_chars && i < 16; ++i)
{
unsigned char c = ((unsigned char *) ptr)[i];
/* >= 33 so space prints in hex */
__small_sprintf (p, c >= 33 && c <= 127 ? " %c" : " %p", c);
p += strlen (p);
}
debug_printf ("read %d bytes (%s%s)", copied_chars, buf,
copied_chars > 16 ? " ..." : "");
}
#endif
debug_printf ("returning %d chars, text mode", copied_chars);
return copied_chars;
}
int
fhandler_base::write (const void *ptr, size_t len)
{
int res;
if (get_append_p ())
SetFilePointer (get_handle(), 0, 0, FILE_END);
else if (wincap.has_lseek_bug () && get_check_win95_lseek_bug ())
{
/* Note: this bug doesn't happen on NT4, even though the documentation
for WriteFile() says that it *may* happen on any OS. */
int actual_length, current_position;
set_check_win95_lseek_bug (0); /* don't do it again */
actual_length = GetFileSize (get_handle (), NULL);
current_position = SetFilePointer (get_handle (), 0, 0, FILE_CURRENT);
if (current_position > actual_length)
{
/* Oops, this is the bug case - Win95 uses whatever is on the disk
instead of some known (safe) value, so we must seek back and
fill in the gap with zeros. - DJ */
char zeros[512];
int number_of_zeros_to_write = current_position - actual_length;
memset(zeros, 0, 512);
SetFilePointer (get_handle (), 0, 0, FILE_END);
while (number_of_zeros_to_write > 0)
{
DWORD zeros_this_time = (number_of_zeros_to_write > 512
? 512 : number_of_zeros_to_write);
DWORD written;
if (!WriteFile (get_handle (), zeros, zeros_this_time, &written,
NULL))
{
__seterrno ();
if (get_errno () == EPIPE)
raise (SIGPIPE);
/* This might fail, but it's the best we can hope for */
SetFilePointer (get_handle (), current_position, 0, FILE_BEGIN);
return -1;
}
if (written < zeros_this_time) /* just in case */
{
set_errno (ENOSPC);
/* This might fail, but it's the best we can hope for */
SetFilePointer (get_handle (), current_position, 0, FILE_BEGIN);
return -1;
}
number_of_zeros_to_write -= written;
}
}
}
if (get_w_binary ())
{
debug_printf ("binary write");
res = raw_write (ptr, len);
}
else
{
debug_printf ("text write");
/* This is the Microsoft/DJGPP way. Still not ideal, but it's
compatible.
Modified slightly by CGF 2000-10-07 */
int left_in_data = len;
char *data = (char *)ptr;
res = 0;
while (left_in_data > 0)
{
char buf[CHUNK_SIZE + 1], *buf_ptr = buf;
int left_in_buf = CHUNK_SIZE;
while (left_in_buf > 0 && left_in_data > 0)
{
char ch = *data++;
if (ch == '\n')
{
*buf_ptr++ = '\r';
left_in_buf--;
}
*buf_ptr++ = ch;
left_in_buf--;
left_in_data--;
if (left_in_data > 0 && ch == '\r' && *data == '\n')
{
*buf_ptr++ = *data++;
left_in_buf--;
left_in_data--;
}
}
/* We've got a buffer-full, or we're out of data. Write it out */
int nbytes;
int want = buf_ptr - buf;
if ((nbytes = raw_write (buf, want)) == want)
{
/* Keep track of how much written not counting additional \r's */
res = data - (char *)ptr;
continue;
}
if (nbytes == -1)
res = -1; /* Error */
else
res += nbytes; /* Partial write. Return total bytes written. */
break; /* All done */
}
}
debug_printf ("%d = write (%p, %d)", res, ptr, len);
return res;
}
off_t
fhandler_base::lseek (off_t offset, int whence)
{
off_t res;
/* Seeks on text files is tough, we rewind and read till we get to the
right place. */
if (whence != SEEK_CUR || offset != 0)
{
if (whence == SEEK_CUR)
offset -= ralen - raixget;
set_readahead_valid (0);
}
debug_printf ("lseek (%s, %d, %d)", unix_path_name, offset, whence);
#if 0 /* lseek has no business messing about with text-mode stuff */
if (!get_r_binary ())
{
int newplace;
if (whence == 0)
{
newplace = offset;
}
else if (whence ==1)
{
newplace = rpos + offset;
}
else
{
/* Seek from the end of a file.. */
if (rsize == -1)
{
/* Find the size of the file by reading till the end */
char b[CHUNK_SIZE];
while (read (b, sizeof (b)) > 0)
;
rsize = rpos;
}
newplace = rsize + offset;
}
if (rpos > newplace)
{
SetFilePointer (handle, 0, 0, 0);
rpos = 0;
}
/* You can never shrink something more than 50% by turning CRLF into LF,
so we binary chop looking for the right place */
while (rpos < newplace)
{
char b[CHUNK_SIZE];
size_t span = (newplace - rpos) / 2;
if (span == 0)
span = 1;
if (span > sizeof (b))
span = sizeof (b);
debug_printf ("lseek (%s, %d, %d) span %d, rpos %d newplace %d",
name, offset, whence,span,rpos, newplace);
read (b, span);
}
debug_printf ("Returning %d", newplace);
return newplace;
}
#endif /* end of deleted code dealing with text mode */
DWORD win32_whence = whence == SEEK_SET ? FILE_BEGIN
: (whence == SEEK_CUR ? FILE_CURRENT : FILE_END);
res = SetFilePointer (get_handle(), offset, 0, win32_whence);
if (res == -1)
{
__seterrno ();
}
else
{
/* When next we write(), we will check to see if *this* seek went beyond
the end of the file, and back-seek and fill with zeros if so - DJ */
set_check_win95_lseek_bug ();
/* If this was a SEEK_CUR with offset 0, we still might have
readahead that we have to take into account when calculating
the actual position for the application. */
if (whence == SEEK_CUR)
res -= ralen - raixget;
}
return res;
}
int
fhandler_base::close ()
{
int res = -1;
syscall_printf ("closing '%s' handle %p", get_name (), get_handle());
if (CloseHandle (get_handle()))
res = 0;
else
{
paranoid_printf ("CloseHandle (%d <%s>) failed", get_handle(),
get_name ());
__seterrno ();
}
return res;
}
int
fhandler_base::ioctl (unsigned int cmd, void *buf)
{
if (cmd == FIONBIO)
syscall_printf ("ioctl (FIONBIO, %p)", buf);
else
syscall_printf ("ioctl (%x, %p)", cmd, buf);
set_errno (EINVAL);
return -1;
}
int
fhandler_base::lock (int, struct flock *)
{
set_errno (ENOSYS);
return -1;
}
extern "C" char * __stdcall
rootdir(char *full_path)
{
/* Possible choices:
* d:... -> d:/
* \\server\share... -> \\server\share\
* else current drive.
*/
char *root = full_path;
if (full_path[1] == ':')
strcpy (full_path + 2, "\\");
else if (full_path[0] == '\\' && full_path[1] == '\\')
{
char *cp = full_path + 2;
while (*cp && *cp != '\\')
cp++;
if (!*cp)
{
set_errno (ENOTDIR);
return NULL;
}
cp++;
while (*cp && *cp != '\\')
cp++;
strcpy (cp, "\\");
}
else
root = NULL;
return root;
}
int __stdcall
fhandler_base::fstat (struct stat *buf, path_conv *)
{
switch (get_device ())
{
case FH_PIPEW:
buf->st_mode = STD_WBITS | S_IWGRP | S_IWOTH;
break;
case FH_PIPER:
buf->st_mode = STD_RBITS;
break;
default:
buf->st_mode = STD_RBITS | STD_WBITS | S_IWGRP | S_IWOTH;
break;
}
buf->st_mode |= get_device () == FH_FLOPPY ? S_IFBLK : S_IFCHR;
buf->st_nlink = 1;
buf->st_blksize = S_BLKSIZE;
buf->st_dev = buf->st_rdev = FHDEVN (get_device ()) << 8 | (get_unit () & 0xff);
buf->st_ino = get_namehash ();
buf->st_atime = buf->st_mtime = buf->st_ctime = time (NULL) - 1;
return 0;
}
void
fhandler_base::init (HANDLE f, DWORD a, mode_t bin)
{
set_io_handle (f);
set_r_binary (bin);
set_w_binary (bin);
access = a;
a &= GENERIC_READ | GENERIC_WRITE;
if (a == GENERIC_READ)
set_flags (O_RDONLY);
if (a == GENERIC_WRITE)
set_flags (O_WRONLY);
if (a == (GENERIC_READ | GENERIC_WRITE))
set_flags (O_RDWR);
set_open_status ();
debug_printf ("created new fhandler_base for handle %p", f);
}
void
fhandler_base::dump (void)
{
paranoid_printf ("here");
}
int
fhandler_base::dup (fhandler_base *child)
{
debug_printf ("in fhandler_base dup");
HANDLE nh;
if (get_nohandle ())
nh = NULL;
else if (!DuplicateHandle (hMainProc, get_handle(), hMainProc, &nh, 0, TRUE,
DUPLICATE_SAME_ACCESS))
{
system_printf ("dup(%s) failed, handle %x, %E",
get_name (), get_handle());
__seterrno ();
return -1;
}
child->set_io_handle (nh);
return 0;
}
int fhandler_base::fcntl (int cmd, void *arg)
{
int res;
switch (cmd)
{
case F_GETFD:
res = get_close_on_exec () ? FD_CLOEXEC : 0;
break;
case F_SETFD:
set_close_on_exec ((int) arg);
res = 0;
break;
case F_GETFL:
res = get_flags ();
debug_printf ("GETFL: %d", res);
break;
case F_SETFL:
{
/*
* Only O_APPEND, O_ASYNC and O_NONBLOCK/O_NDELAY are allowed.
* Each other flag will be ignored.
* Since O_ASYNC isn't defined in fcntl.h it's currently
* ignored as well.
*/
const int allowed_flags = O_APPEND | O_NONBLOCK_MASK;
int new_flags = (int) arg & allowed_flags;
/* Carefully test for the O_NONBLOCK or deprecated OLD_O_NDELAY flag.
Set only the flag that has been passed in. If both are set, just
record O_NONBLOCK. */
if ((new_flags & OLD_O_NDELAY) && (new_flags & O_NONBLOCK))
new_flags = O_NONBLOCK;
set_flags ((get_flags () & ~allowed_flags) | new_flags);
}
res = 0;
break;
case F_GETLK:
case F_SETLK:
case F_SETLKW:
res = lock (cmd, (struct flock *) arg);
break;
default:
set_errno (EINVAL);
res = -1;
break;
}
return res;
}
/* Base terminal handlers. These just return errors. */
int
fhandler_base::tcflush (int)
{
set_errno (ENOTTY);
return -1;
}
int
fhandler_base::tcsendbreak (int)
{
set_errno (ENOTTY);
return -1;
}
int
fhandler_base::tcdrain (void)
{
set_errno (ENOTTY);
return -1;
}
int
fhandler_base::tcflow (int)
{
set_errno (ENOTTY);
return -1;
}
int
fhandler_base::tcsetattr (int, const struct termios *)
{
set_errno (ENOTTY);
return -1;
}
int
fhandler_base::tcgetattr (struct termios *)
{
set_errno (ENOTTY);
return -1;
}
int
fhandler_base::tcsetpgrp (const pid_t)
{
set_errno (ENOTTY);
return -1;
}
int
fhandler_base::tcgetpgrp (void)
{
set_errno (ENOTTY);
return -1;
}
void
fhandler_base::operator delete (void *p)
{
cfree (p);
return;
}
/* Normal I/O constructor */
fhandler_base::fhandler_base (DWORD devtype, int unit):
status (devtype),
access (0),
io_handle (NULL),
namehash (0),
openflags (0),
rabuf (NULL),
ralen (0),
raixget (0),
raixput (0),
rabuflen (0),
unix_path_name (NULL),
win32_path_name (NULL),
open_status (0)
{
int bin = __fmode & O_TEXT ? 0 : 1;
if (status != FH_DISK && status != FH_CONSOLE)
{
if (!get_r_binset ())
set_r_binary (bin);
if (!get_w_binset ())
set_w_binary (bin);
}
}
/* Normal I/O destructor */
fhandler_base::~fhandler_base (void)
{
if (unix_path_name != NULL)
cfree (unix_path_name);
if (win32_path_name != NULL)
cfree (win32_path_name);
if (rabuf)
free (rabuf);
unix_path_name = win32_path_name = NULL;
}
/**********************************************************************/
/* /dev/null */
fhandler_dev_null::fhandler_dev_null () :
fhandler_base (FH_NULL)
{
}
void
fhandler_dev_null::dump (void)
{
paranoid_printf ("here");
}
void
fhandler_base::set_inheritance (HANDLE &h, int not_inheriting)
{
#ifdef DEBUGGING
HANDLE oh = h;
#endif
/* Note that we could use SetHandleInformation here but it is not available
on all platforms. Test cases seem to indicate that using DuplicateHandle
in this fashion does not actually close the original handle, which is
what we want. If this changes in the future, we may be forced to use
SetHandleInformation on newer OS's */
if (!DuplicateHandle (hMainProc, h, hMainProc, &h, 0, !not_inheriting,
DUPLICATE_SAME_ACCESS | DUPLICATE_CLOSE_SOURCE))
debug_printf ("DuplicateHandle failed, %E");
#ifdef DEBUGGING
if (h)
setclexec_pid (oh, h, not_inheriting);
#endif
}
void
fhandler_base::fork_fixup (HANDLE parent, HANDLE &h, const char *name)
{
#ifdef DEBUGGING
HANDLE oh = h;
#endif
if (/* !is_socket () && */ !get_close_on_exec ())
debug_printf ("handle %p already opened", h);
else if (!DuplicateHandle (parent, h, hMainProc, &h, 0, !get_close_on_exec (),
DUPLICATE_SAME_ACCESS))
system_printf ("%s - %E, handle %s<%p>", get_name (), name, h);
#ifdef DEBUGGING
else
{
debug_printf ("%s success - oldh %p, h %p", get_name (), oh, h);
// someday, maybe ProtectHandle2 (h, name);
setclexec_pid (oh, h, !get_close_on_exec ());
}
#endif
}
void
fhandler_base::set_close_on_exec (int val)
{
set_inheritance (io_handle, val);
set_close_on_exec_flag (val);
debug_printf ("set close_on_exec for %s to %d", get_name (), val);
}
void
fhandler_base::fixup_after_fork (HANDLE parent)
{
debug_printf ("inheriting '%s' from parent", get_name ());
fork_fixup (parent, io_handle, "io_handle");
}
bool
fhandler_base::is_nonblocking ()
{
return (openflags & O_NONBLOCK_MASK) != 0;
}
void
fhandler_base::set_nonblocking (int yes)
{
int current = openflags & O_NONBLOCK_MASK;
int new_flags = yes ? (!current ? O_NONBLOCK : current) : 0;
openflags = (openflags & ~O_NONBLOCK_MASK) | new_flags;
}
DIR *
fhandler_base::opendir (path_conv&)
{
set_errno (ENOTDIR);
return NULL;
}
struct dirent *
fhandler_base::readdir (DIR *)
{
set_errno (ENOTDIR);
return NULL;
}
off_t
fhandler_base::telldir (DIR *)
{
set_errno (ENOTDIR);
return -1;
}
void
fhandler_base::seekdir (DIR *, off_t)
{
set_errno (ENOTDIR);
return;
}
void
fhandler_base::rewinddir (DIR *)
{
set_errno (ENOTDIR);
return;
}
int
fhandler_base::closedir (DIR *)
{
set_errno (ENOTDIR);
return -1;
}
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