From 6fa6a1f865b56b1dee05d780c788686db3bd3c2a Mon Sep 17 00:00:00 2001 From: Peter Stephenson Date: Tue, 6 Apr 2004 09:25:17 +0000 Subject: Peter Castro: Cygwin improvements for dynamic libraries, text/binary, paths --- Src/main.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) (limited to 'Src/main.c') diff --git a/Src/main.c b/Src/main.c index c9c5fa867..30eef5a25 100644 --- a/Src/main.c +++ b/Src/main.c @@ -30,6 +30,62 @@ #include "zsh.mdh" #include "main.pro" +/* + * 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__ */ + /**/ int main(int argc, char **argv) -- cgit 1.4.1