Help with UNIX f77 file buffer system

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3 total messages Started by Petros Dafniotis Mon, 25 Jan 1993 15:19

#4488

Author: Petros Dafniotis
Date: Mon, 25 Jan 1993 15:19

22 lines
1530 bytes

Hello netters,

  I know very little about UNIX (in fact I am using VMS for almost 9yrs now).
A friend of mine had the following problem:
"His program (all written in FORTRAN by 1-2 people years ago) takes quite
some time to finish. He is writing info produced at
run time to 2-3 output files. However, 90% of the runs are proved to be
useless quite soon; so he uses CTRL-C to abort execution. But then he finds
no info in the output files. I am guessing that the UNIX file buffer system
still keeps these numbers in the buffer and what he needs is to flush the
buffers after each single write. Could someone tell me how can this be
accomplished in UNIX? (he is using HP-RISC and SUN SPARC-I workstations)."

  I would appreciate any help/comments (replies either by e-mail or in the
news are fine). Thank you,

				Petros Dafniotis
				Chem Engr Dept, UW-Madison
			e-mail: dafnioti@cae.wisc.edu

PS: I managed to do that by using really a C function to do all open/fprintf/
    fflush/close commands. But I would prefer a FORTRAN way (if possible).

Re: Help with UNIX f77 file buffer system

#4490

Author: System Admin (Mike Peterson)
Date: Mon, 25 Jan 1993 16:17

24 lines
1938 bytes

In article <1993Jan25.091937.5738@doug.cae.wisc.edu> dafnioti@cae.wisc.edu (Petros Dafniotis) writes:
>Hello netters,
>
>  I know very little about UNIX (in fact I am using VMS for almost 9yrs now).
>A friend of mine had the following problem:
>"His program (all written in FORTRAN by 1-2 people years ago) takes quite
>some time to finish. He is writing info produced at
>run time to 2-3 output files. However, 90% of the runs are proved to be
>useless quite soon; so he uses CTRL-C to abort execution. But then he finds
>no info in the output files. I am guessing that the UNIX file buffer system
>still keeps these numbers in the buffer and what he needs is to flush the
>buffers after each single write. Could someone tell me how can this be
>accomplished in UNIX? (he is using HP-RISC and SUN SPARC-I workstations)."

Try the 'flush' routine from the BSD F77 library (it should be in HP-UX
9.0, but is not in HP-UX 8.07); Sun has had that library for ages.
If you are stuck at 8.07, write a C routine that calls fflush
after using FSTREAM (see p. 9-30 of the FORTRAN manual) to get the
C "FILE *" pointer. This approach will not work on stdin/stdout/stderr
at 8.07, but works fine on other unit numbers.
-- 
core error - bus dumped    -*-    Mike Peterson, SysAdmin, U/Toronto Chemistry
 *******   As usual, I speak only for me, myself and I; nobody else   *******
E-mail: system@alchemy.chem.utoronto.ca  Tel: (416)978-7094  Fax: (416)978-8775

Re: Help with UNIX f77 file buffer system

#4504

Author: Ken Bell
Date: Tue, 26 Jan 1993 05:15

12 lines
947 bytes

In <1993Jan25.091937.5738@doug.cae.wisc.edu> dafnioti@cae.wisc.edu (Petros Dafniotis) writes:

>no info in the output files. I am guessing that the UNIX file buffer system
>still keeps these numbers in the buffer and what he needs is to flush the
>buffers after each single write. Could someone tell me how can this be
>accomplished in UNIX? (he is using HP-RISC and SUN SPARC-I workstations)."

Why not catch SIGINT (see signal(3C)) and simply close() all files
before exiting?

-- 
Ken Bell  (kenbell@panix.com  -or-  syklb@nasagiss.giss.nasa.gov)

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