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linux: add futimes() fallback

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The utimensat() syscall was added in 2.6.22. Add a fallback mode for
older kernels that uses utimes("/proc/self/fd/<fd>").

Fixes #687.
This commit is contained in:
Ben Noordhuis 2013-01-17 14:19:58 +01:00
parent 629a59b35b
commit 9d4a16eefe
1 changed files with 28 additions and 1 deletions
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29
src/unix/fs.c
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@ -113,12 +113,39 @@ static ssize_t uv__fs_futime(uv_fs_t* req) {
/* utimesat() has nanosecond resolution but we stick to microseconds /* utimesat() has nanosecond resolution but we stick to microseconds
* for the sake of consistency with other platforms. * for the sake of consistency with other platforms.
*/ */
static int no_utimesat;
struct timespec ts[2]; struct timespec ts[2];
struct timeval tv[2];
char path[sizeof("/proc/self/fd/") + 3 * sizeof(int)];
int r;
if (no_utimesat)
goto skip;
ts[0].tv_sec = req->atime; ts[0].tv_sec = req->atime;
ts[0].tv_nsec = (unsigned long)(req->atime * 1000000) % 1000000 * 1000; ts[0].tv_nsec = (unsigned long)(req->atime * 1000000) % 1000000 * 1000;
ts[1].tv_sec = req->mtime; ts[1].tv_sec = req->mtime;
ts[1].tv_nsec = (unsigned long)(req->mtime * 1000000) % 1000000 * 1000; ts[1].tv_nsec = (unsigned long)(req->mtime * 1000000) % 1000000 * 1000;
return uv__utimesat(req->file, NULL, ts, 0);
r = uv__utimesat(req->file, NULL, ts, 0);
if (r == 0)
return r;
if (errno != ENOSYS)
return r;
no_utimesat = 1;
skip:
tv[0].tv_sec = req->atime;
tv[0].tv_usec = (unsigned long)(req->atime * 1000000) % 1000000;
tv[1].tv_sec = req->mtime;
tv[1].tv_usec = (unsigned long)(req->mtime * 1000000) % 1000000;
snprintf(path, sizeof(path), "/proc/self/fd/%d", (int) req->file);
return utimes(path, tv);
#elif defined(__APPLE__) \ #elif defined(__APPLE__) \
|| defined(__DragonFly__) \ || defined(__DragonFly__) \
|| defined(__FreeBSD__) \ || defined(__FreeBSD__) \