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q37668
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1988-11-08
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Q37668 _dos_setftime: File Must Be Opened as Read Only
C Compiler
5.10 | 5.10
MS-DOS | OS/2
Summary:
To use the _dos_setftime function to set the date and time to which a
file was last written, open the file as read only. If you open the
file with write privileges, the time and date are re-updated by the
close function. The program below demonstrates the correct useage;
however, it only works in DOS, not in the OS/2 compatibility box,
where it gives an error message "invalid argument" and returns err =
1.
More Information:
The following code demonstrates this behavior:
#include <stdio.h>
#include <dos.h>
#include <fcntl.h>
#include <sys\types.h>
#include <sys\stat.h>
#include <io.h>
#include <stdlib.h>
main()
{
unsigned date = 0x421;
unsigned time = 0xC0F;
int fh, err;
if (_dos_open("hang.c",O_RDONLY, &fh) != 0)
perror("open failed on input file");
else
printf("opend succeeded on input file\n");
err = _dos_setftime (fh, date, time);
if (err != 0)
{
perror("date and time not changed");
printf("%d\n",err);
}
else
printf("date and time changed\n");
if (_dos_close(fh) != 0)
perror("close failed");
else
printf("file successfully closed\n");
}
Keywords: docerr buglist5.10
Updated 88/11/09 05:51