Conference vmszoo::vms_posix

1365.0. "Help: EAGAIN errno 11 opening files" by GOYA::16.190.32.202::IB002::Antoniog () Thu Apr 03 1997 12:52

Hi all of you,
We have a customer porting a POSIX appl. to OVMS POSIX and they get errno 11 
when openning many files (c isam). They open the file, read the header, open 
the next, etc.
When they try to open the file 19 (2 disk files per c isam file gives file 
number 37) they get errno 11 (EAGAIN) witout any other clue.

OpenVMS AXP 6.2-1H2, POSIX 2.0.
The function: open (name, O_RDWR or O_RDONLY, S_ALLMODES)
If we sleep several seconds from open to the other, it WORKS !

They does not use CMA$RTL, OPEN_MAX, ...
SPTREQ & NPAGEVIR high

In the next reply you can find a test program that shows the error.

It works perfectly on DIGITAL UNIX and many many other platforms.

This test program works on VMS.

Pls. can any of you give us any help??

Antonio Gonzalez @SQO
DTN: 874-4361
SPAIN

#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <stat.h>

void main()
{
        int fp[80];
        int i;
        char fichero[80];
        char buffer[256];
        int n;

        for(i=0;i<40;i++) {
                sprintf(fichero,"fichero%d",i+1);
                fp[i]=open(fichero,O_RDONLY);
                if (fp[i]<0)
                        exit(printf("Error reading file \n"));
        }
        printf("process finished OK\n");
}
                     

    The answer is in the POSIX for OpenVMS Installation and System
    Management Guide, point 5.6.
    The parameter to change is POSIX$FAST_IO to 0
    DCL> define/sys/exe POSIX$FAST_IO 0
    
    Tips. If you don't have time to read manuals, you can always use
    Altavista.