Replace usleep() with nanosleep()

As usleep has been obsoleted, changed all invocations of usleep
to nanosleep. From man 3 usleep:

"4.3BSD, POSIX.1-2001.  POSIX.1-2001 declares this function
 obsolete; use nanosleep(2) instead. POSIX.1-2008 removes the
 specification of usleep()."

Added a helper function gf_nanosleep() to have a single place
for handling edge cases that might arise from the conversion of
usleep to nanosleep and allow the sleep to resume with right
remaining value upon being interrupted.

Fixes: bz#1721686

Change-Id: Ia39ab82c9e0f4669d2c00d4cdf25e38d94ef9f62
Signed-off-by: Vijay Bellur <vbellur@redhat.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/libglusterfs/src/common-utils.c b/libglusterfs/src/common-utils.c
index 8e2ffa3accd..132e63e520a 100644
--- a/libglusterfs/src/common-utils.c
+++ b/libglusterfs/src/common-utils.c
@@ -5421,3 +5421,21 @@ gf_d_type_from_ia_type(ia_type_t type)
             return DT_UNKNOWN;
     }
 }
+
+int
+gf_nanosleep(uint64_t nsec)
+{
+    struct timespec req;
+    struct timespec rem;
+    int ret = -1;
+
+    req.tv_sec = nsec / GF_SEC_IN_NS;
+    req.tv_nsec = nsec % GF_SEC_IN_NS;
+
+    do {
+        ret = nanosleep(&req, &rem);
+        req = rem;
+    } while (ret == -1 && errno == EINTR);
+
+    return ret;
+}