gayman@ARI-HQ1.ARPA ("%*Gayman, Beth") (03/06/87)
LIB$SPAWN question: Does LIB$SPAWN work from a detached process? I have a simple program that works fine until I try to RUN/DETACH. Any comments welcome. I have included the code to illustrate. +++++++++++++++++++++++ Begin here ++++++++++++++++++++++++++++++++++++++++++ ; ;UPS.MAR ; .LIBRARY "SYS$LIBRARY:LIB.MLB" C_STRING: .ASCII !MAIL/SUBJECT="TEST MAIL MESSAGE" ! .ASCII !NL: GAYMAN! C_STRING_LENGTH=.-C_STRING C_STRING_DESC: .WORD C_STRING_LENGTH .BYTE DSC$K_DTYPE_T .BYTE DSC$K_CLASS_S .ADDRESS C_STRING ; .ENTRY UPS ^M <> PUSHAQ C_STRING_DESC CALLS #1,G^LIB$SPAWN BLBC R0,ERROR MOVL #1,R0 ERROR: $EXIT_S R0 .END UPS ++++++++++++++++++++++ The End. +++++++++++++++++++++++++++++++++++++++++++++ Elizabeth Gayman (GAYMAN@ARI-HQ1.ARPA) ------ ------
gwalker@SPCA.BBN.COM.UUCP (03/07/87)
I have often seen problems with programs that work fine when run normally but don't work when run with /detach. I think it has always turned out to be the case that the detached process gets confused about what its input, output, and error channels are. I suspect if you did the RUN/DETACH and specified the input, output, and error to be some file or NLA0: OR if you modified the program to pass the input and output arguments to lib$spawn as NLA0:, it would probably work. -- Gail Walker
ken@HAMLET.CALTECH.EDU.UUCP (03/07/87)
> Does LIB$SPAWN work from a detached process? I have a simple program that > works fine until I try to RUN/DETACH. Any comments welcome. I have included > the code to illustrate. Sometimes. The spawn function is preformed by DCL (the CLI). If the detached process is started with loginout then it will have a CLI and be able to use LIB$SPAWN. If you start the process with RUN/DETACH PROGRAM.EXE the process does not have a CLI and cannot use LIB$SPAWN. If you start the process with RUN/DETACH SYS$SYSTEM:LOGINOUT/INPUT=PROGRAM.COM where PROGRAM.COM can be a one-liner of "$ RUN PROGRAM", then the LOGINOUT which runs before your program maps the CLI and your program can use LIB$SPAWN. Kenneth Adelman Caltech