On Wed, 25 Jun 2003, Alex Vinokur wrote:
> ===========================================
> Windows 2000
> CYGWIN_NT-5.0 1.3.22(0.78/3/2)
> GNU gcc version 3.2 20020927 (prerelease)
> ===========================================
>
> Here is some function.
>
> --------------------------------------
> void read_file (char* filename_i)
> {
> int fd = open(filename_i, O_RDONLY);
> assert (fd > 2);
>
> off_t sz = lseek(fd, 0, SEEK_END);
> char* ptr = (char*)mmap(0, sz, PROT_READ, 0, fd, 0);
>
> assert (ptr != MAP_FAILED); // Here assertion failed
> if (ptr != MAP_FAILED)
> {
> string str(ptr, ptr+sz);
> munmap(ptr, sz);
> }
>
> close(fd);
> }
> --------------------------------------
>
> Assertion "ptr != MAP_FAILED)" failed.
> What might cause that?
This is just a stab in the dark, of course, but surely `ptr != MAP_FAILED'
would indicate that the mmap did not fail? Assertions (assert()) are based on
true or false, so the above assert is false in that `ptr != MAP_FAILED'.
Elfyn
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