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* main.c - the main() function
* This file is part of zsh, the Z shell.
* Copyright (c) 1992-1997 Paul Falstad
* All rights reserved.
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and to distribute modified versions of this software for any
* purpose, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
* In no event shall Paul Falstad or the Zsh Development Group be liable
* to any party for direct, indirect, special, incidental, or consequential
* damages arising out of the use of this software and its documentation,
* even if Paul Falstad and the Zsh Development Group have been advised of
* the possibility of such damage.
* Paul Falstad and the Zsh Development Group specifically disclaim any
* warranties, including, but not limited to, the implied warranties of
* merchantability and fitness for a particular purpose. The software
* provided hereunder is on an "as is" basis, and Paul Falstad and the
* Zsh Development Group have no obligation to provide maintenance,
* support, updates, enhancements, or modifications.
#include "zsh.mdh"
#include ""
* Support for Cygwin binary/text mode filesystems.
* Peter A. Castro <>
* This deserves some explaination, because it uses Cygwin specific
* runtime functions.
* Cygwin supports the notion of binary or text mode access to files
* based on the mount attributes of the filesystem. If a file is on
* a binary mounted filesystem, you get exactly what's in the file, CRLF's
* and all. If it's on a text mounted filesystem, Cygwin will strip out
* the CRs. This presents a problem because zsh code doesn't allow for
* CRLF's as line terminators. So, we must force all open files to be
* in text mode reguardless of the underlying filesystem attributes.
* However, we only want to do this for reading, not writing as we still
* want to write files in the mode of the filesystem. To do this,
* we have two options: augment all {f}open() calls to have O_TEXT added to
* the list of file mode options, or have the Cygwin runtime do it for us.
* I choose the latter. :)
* Cygwin's runtime provides pre-execution hooks which allow you to set
* various attributes for the process which effect how the process functions.
* One of these attributes controls how files are opened. I've set
* it up so that all files opened RDONLY will have the O_TEXT option set,
* thus forcing line termination manipulation. This seems to solve the
* problem (at least the Test suite runs clean :).
* Note: this may not work in later implementations. This will override
* all mode options passed into open(). Cygwin (really Windows) doesn't
* support all that much in options, so for now this is OK, but later on
* it may not, in which case O_TEXT will have to be added to all opens calls
* appropriately.
* This function is actually a hook in the Cygwin runtime which
* is called before the main of a program. Because it's part of the program
* pre-startup, it must be located in the program main and not in a DLL.
* It must also be made an export so the linker resolves this function to
* our code instead of the default Cygwin stub routine.
#ifdef __CYGWIN__
mod_export void
cygwin_premain0 (int argc, char **argv, void *myself)
static struct __cygwin_perfile pf[] =
{"", O_RDONLY | O_TEXT},
{NULL, 0}
cygwin_internal (CW_PERFILE, pf);
#endif /* __CYGWIN__ */
main(int argc, char **argv)
return (zsh_main(argc, argv));