[glibc/fw/builtin-syscalls-4] hurd: Make getrandom honour GRND_NONBLOCK

[glibc/fw/builtin-syscalls-4] hurd: Make getrandom honour GRND_NONBLOCK

[Florian Weimer]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a45244ce127763872ff0b5743fb4ac8299ee9b28

commit a45244ce127763872ff0b5743fb4ac8299ee9b28
Author: James Clarke <jrtc27@jrtc27.com>
Date:   Tue Dec 17 18:29:29 2019 +0000

    hurd: Make getrandom honour GRND_NONBLOCK
    
    * sysdeps/mach/hurd/getrandom.c (__getrandom): Open the random source
    with O_NONBLOCK when the GRND_NONBLOCK flag is provided.
    Message-Id: <20191217182929.90989-1-jrtc27@jrtc27.com>

Diff:
---
 sysdeps/mach/hurd/getrandom.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/sysdeps/mach/hurd/getrandom.c b/sysdeps/mach/hurd/getrandom.c
index 8bf42aa..aac9c6f 100644
--- a/sysdeps/mach/hurd/getrandom.c
+++ b/sysdeps/mach/hurd/getrandom.c
@@ -27,13 +27,17 @@ ssize_t
 __getrandom (void *buffer, size_t length, unsigned int flags)
 {
   const char *random_source = "/dev/urandom";
+  int open_flags = O_RDONLY | O_CLOEXEC;
   size_t amount_read;
   int fd;
 
   if (flags & GRND_RANDOM)
     random_source = "/dev/random";
 
-  fd = __open_nocancel(random_source, O_RDONLY | O_CLOEXEC);
+  if (flags & GRND_NONBLOCK)
+    open_flags |= O_NONBLOCK;
+
+  fd = __open_nocancel(random_source, open_flags);
   if (fd == -1)
     return -1;