Corinna,
> No, it doesn't change that often. 1.7.9 is actually a year old,
> though. Updating *might* help.
>
> Btw., assuming you call lseek(fileno(p), SEEK_CUR, 0) rather than
> ftell(p), what position does it return?
I have rewritten my program to use only low-level API (open, write,
lseek) and installed latest Cygwin. It seems that the error is caused
by O_RDWR - as soon as I change it to O_WRONLY everything starts to
work:
Local, O_WRONLY:
C:\Users\gribov.y>\\s-cw-head\pgas\a.exe //s-cw-head/c$/test.bin
success
Local, O_RDWR:
C:\Users\gribov.y>\\s-cw-head\pgas\a.exe //s-cw-head/c$/test.bin rw
success
Remote, O_WRONLY:
C:\Users\gribov.y>\\s-cw-head\pgas\a.exe //s-cw-node01/c$/test.bin
success
Remote, O_RDWR:
C:\Users\gribov.y>\\s-cw-head\pgas\a.exe //s-cw-node01/c$/test.bin rw
sizeof(data) == lseek(fd, 0, SEEK_END) failed at io.c:36
--
Best regards,
Yuri
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <fcntl.h>
#define CHECK(cond) do { \
if( !(cond) ) { \
printf("%s failed at %s:%d\n", #cond, __FILE__, __LINE__); \
exit(1); \
} } while(0)
int main(int argc, char *argv[]) {
if( argc < 2 ) {
fprintf(stderr, "Syntax: a.exe fname [mode]\n");
exit(1);
}
const char *fname = argv[1];
int mode = O_CREAT | O_TRUNC;
if( argc > 2 && 0 == strcmp("rw", argv[2]) )
mode |= O_RDWR;
else
mode |= O_WRONLY;
const int perm = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
const unsigned data = -1;
int fd = open(fname, mode, perm);
CHECK( -1 != fd );
close(fd);
fd = open(fname, mode, perm);
CHECK( -1 != fd );
CHECK( sizeof(data) == write(fd, &data, sizeof(data)) );
CHECK( sizeof(data) == lseek(fd, 0, SEEK_END) );
CHECK( sizeof(data) == lseek(fd, 0, SEEK_CUR) );
printf("success\n");
return 0;
}
--
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