On 2/21/07, Andreas Schwab <[EMAIL PROTECTED]> wrote:
Paul Eggert <[EMAIL PROTECTED]> writes:
> This should be a rarer problem, I think, since O_NOFOLLOW is typically
> implemented by the operating system, not by the file system, so it
> typically either works on all file systems, or works on no file
> systems.
Even then, the kernel might be different from the one you are building
for.
Yes, you can't assume that O_NOFOLLOW is available as a feature just
because the build system defined it. Findutils does this:-
#if defined(O_NOFOLLOW)
static boolean
check_nofollow(void)
{
struct utsname uts;
float release;
if (0 == uname(&uts))
{
/* POSIX requires that atof() ignore "unrecognised suffixes". */
release = atof(uts.release);
if (0 == strcmp("Linux", uts.sysname))
{
/* Linux kernels 2.1.126 and earlier ignore the O_NOFOLLOW flag. */
return release >= 2.2; /* close enough */
}
else if (0 == strcmp("FreeBSD", uts.sysname))
{
/* FreeBSD 3.0-CURRENT and later support it */
return release >= 3.1;
}
}
/* Well, O_NOFOLLOW was defined, so we'll try to use it. */
return true;
}
#endif
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