nscd: fall back gracefully on kernels without AF_UNIX support

[musl] / src / time / clock_nanosleep.c

diff --git a/src/time/clock_nanosleep.c b/src/time/clock_nanosleep.c
index ec87b9e..e195499 100644 (file)
--- a/src/time/clock_nanosleep.c
+++ b/src/time/clock_nanosleep.c
@@ -1,8 +1,38 @@
 #include <time.h>
+#include <errno.h>
 #include "syscall.h"
-#include "libc.h"
 
-int clock_nanosleep(clockid_t clk, int flags, const struct timespec *req, struct timespec *rem)
+#define IS32BIT(x) !((x)+0x80000000ULL>>32)
+#define CLAMP(x) (int)(IS32BIT(x) ? (x) : 0x7fffffffU+((0ULL+(x))>>63))
+
+int __clock_nanosleep(clockid_t clk, int flags, const struct timespec *req, struct timespec *rem)
 {
+       if (clk == CLOCK_THREAD_CPUTIME_ID) return EINVAL;
+#ifdef SYS_clock_nanosleep_time64
+       time_t s = req->tv_sec;
+       long ns = req->tv_nsec;
+       int r = -ENOSYS;
+       if (SYS_clock_nanosleep == SYS_clock_nanosleep_time64 || !IS32BIT(s))
+               r = __syscall_cp(SYS_clock_nanosleep_time64, clk, flags,
+                       ((long long[]){s, ns}), rem);
+       if (SYS_clock_nanosleep == SYS_clock_nanosleep_time64 || r!=-ENOSYS)
+               return -r;
+       long long extra = s - CLAMP(s);
+       long ts32[2] = { CLAMP(s), ns };
+       if (clk == CLOCK_REALTIME && !flags)
+               r = __syscall_cp(SYS_nanosleep, &ts32, &ts32);
+       else
+               r = __syscall_cp(SYS_clock_nanosleep, clk, flags, &ts32, &ts32);
+       if (r==-EINTR && rem && !(flags & TIMER_ABSTIME)) {
+               rem->tv_sec = ts32[0] + extra;
+               rem->tv_nsec = ts32[1];
+       }
+       return -r;
+#else
+       if (clk == CLOCK_REALTIME && !flags)
+               return -__syscall_cp(SYS_nanosleep, req, rem);
        return -__syscall_cp(SYS_clock_nanosleep, clk, flags, req, rem);
+#endif
 }
+
+weak_alias(__clock_nanosleep, clock_nanosleep);