[Freedos-user] [Fwd: CMDXSWP.COM missing from list of DOS shells]
From the djgpp mailing list:
Original Message
Subject: CMDXSWP.COM missing from list of DOS shells
Date: Fri, 02 Apr 2004 22:11:25 GMT
From: Fabrizio Gennari [EMAIL PROTECTED]
Organization: TIN
Newsgroups: comp.os.msdos.djgpp
FreeDOS distributes a shell called CMDXSWP.COM, which is a DOS-style
shell. i.e. requires the /c switch when launching commands.
Unfortunately, it is not present in the list of DOS-style shells present
in the file libc/dos/process/dosexec.c, variable shell_brokets. Since
FreeDOS by default sets the COMSPEC env variable to point to this, it
may cause problems: for example, the system() function invokes the shell
without /c, causing the invocation to fail.
Example: take this somple program
int main(){
system(echo Hello World!);
return 0;
}
, compile it with DJGPP, and run it on a FreeDOS system with FreeDOS
installed, no SHELL variable and the variable COMSPEC pointing to
CMDXSWP.COM . It fails, because system(), detecting that echo is not an
executable file, tries to launch the shell, passing echo Hello World!
as the parameter. Unfortunately, it does that without the /c switch.
The fix would be to include CMDXSWP.COM in dosexec.c. A workaround is to
set the SHELL variable to COMMAND.COM, which is correctly detected by
DJGPP as being a DOS-style shell.
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Re: [Freedos-user] [Fwd: CMDXSWP.COM missing from list of DOS shells]
Hi, CMDXSWP is just a renamed FreeCOM (command.com) placed in the FreeDOS directory for distinguishing the non-XMS FreeCOM version (command.com) from the XMS-swap version (cmdxswp.com). in the next FreeDOS release (estimated release: within 2 weeks) this has been changed: C:\FDOS\BIN\ contains command.com (non-XMSswap version). C:\FDOS\NLS contains command.cln and xmsswap.cln and strings.dat and then either C:\COMMAND.COM or C:\FDOS\COMMAND.COM are a command.com. 80286+: COPY /B XMSSWAP.CLN + STRINGS.DAT C:\COMMAND.COM 8086/80186: COPY /B COMMAND.CLN + STRINGS.DAT C:\COMMAND.COM so you'll just need a more generic solution for DJGPP. DOS-style shell versus Unix-style shell doesn't say anything to me. best solution for DJGPP might be to just stick with COMMAND.COM as name. Bernd FreeDOS distributes a shell called CMDXSWP.COM, which is a DOS-style shell. i.e. requires the /c switch when launching commands. Unfortunately, it is not present in the list of DOS-style shells present in the file libc/dos/process/dosexec.c, variable shell_brokets. Since FreeDOS by default sets the COMSPEC env variable to point to this, it may cause problems: for example, the system() function invokes the shell without /c, causing the invocation to fail. --- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id=1470alloc_id=3638op=click ___ Freedos-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/freedos-user
