helper marco for dealing with syscalls that are interrupted

src/os/core/linux/os_core_linux.h

@@ -38,6 +38,17 @@ int pthread_getname_np(pthread_t thread, char *name, size_t size);
 typedef struct tm tm;
 typedef struct timespec timespec;
 
+////////////////////////////////
+
+#define OS_LNX_RETRY_ON_EINTR(expr)          \
+  (__extension__({                           \
+  __typeof__(expr) __ret;                    \
+  do {                                       \
+  __ret = (expr);                            \
+  } while ((__ret == -1) && errno == EINTR); \
+  __ret;                                     \
+  }))
+
 ////////////////////////////////
 //~ rjf: File Iterator