[incubator-nuttx] branch master updated: libc: sysconf support _SC_NPROCESSORS_CONF/_SC_NPROCESSORS_ONLN

[aguettouche]

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aguettouche pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/incubator-nuttx.git


The following commit(s) were added to refs/heads/master by this push:
     new 977f04a  libc: sysconf support 
_SC_NPROCESSORS_CONF/_SC_NPROCESSORS_ONLN
977f04a is described below

commit 977f04a2b11e9b46b3d43d62b904378159c64987
Author: Xiang Xiao <xiaoxi...@xiaomi.com>
AuthorDate: Sat Jun 27 00:08:59 2020 +0800

    libc: sysconf support _SC_NPROCESSORS_CONF/_SC_NPROCESSORS_ONLN
    
    specified here:
    https://www.man7.org/linux/man-pages/man3/sysconf.3.html
    
    Signed-off-by: Xiang Xiao <xiaoxi...@xiaomi.com>
    Change-Id: I87fba8476221797e59c69c1953974bebc8d0d7b3
---
 include/unistd.h               | 3 +++
 libs/libc/unistd/lib_sysconf.c | 8 ++++++++
 2 files changed, 11 insertions(+)

diff --git a/include/unistd.h b/include/unistd.h
index 1e3351e..1e29d2a 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -255,6 +255,9 @@
 #define _SC_XOPEN_UNIX                   0x0079
 #define _SC_XOPEN_VERSION                0x007a
 
+#define _SC_NPROCESSORS_CONF             0x007b
+#define _SC_NPROCESSORS_ONLN             0x007c
+
 /* The following symbolic constants must be defined for file streams: */
 
 #define STDERR_FILENO                    2       /* File number of stderr */
diff --git a/libs/libc/unistd/lib_sysconf.c b/libs/libc/unistd/lib_sysconf.c
index c27acf7..6da2394 100644
--- a/libs/libc/unistd/lib_sysconf.c
+++ b/libs/libc/unistd/lib_sysconf.c
@@ -233,6 +233,14 @@ long sysconf(int name)
         return 0;
 #endif
 
+      case _SC_NPROCESSORS_CONF:
+      case _SC_NPROCESSORS_ONLN:
+#ifdef CONFIG_SMP_NCPUS
+        return CONFIG_SMP_NCPUS;
+#else
+        return 1;
+#endif
+
       default:
 #if 0 /* Assume valid but not implemented for the time being */
         errcode = EINVAL;