From 8078b707f9d757622b028a4fd494d6f7e7e2a1ed Mon Sep 17 00:00:00 2001
From: "A. Wilcox" <AWilcox@Wilcox-Tech.com>
Date: Fri, 15 Mar 2019 11:23:16 -0500
Subject: getconf: Use statvfs(2) and statfs(2) on Linux

This allows us to have a correct, variable NAME_MAX (and others).
---
 getconf/getconf.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/getconf/getconf.c b/getconf/getconf.c
index 9517925..5a9da22 100644
--- a/getconf/getconf.c
+++ b/getconf/getconf.c
@@ -6,6 +6,10 @@
  */
 
 
+#ifdef __linux__
+#	include <sys/statvfs.h>	/* statvfs */
+#	include <sys/vfs.h>	/* statfs */
+#endif
 #include <errno.h>	/* errno */
 #include <limits.h>	/* limit_vars */
 #include <stdbool.h>	/* bool type and true/false */
@@ -544,6 +548,45 @@ int do_path_var(char *environment, char *path_var, char *pathname)
 
 		errno = 0;
 
+#ifdef __linux__
+		switch(path_vars[var].value)
+		{
+		case _PC_REC_XFER_ALIGN:
+		case _PC_ALLOC_SIZE_MIN:
+		{
+			struct statvfs vfsres;
+			if(statvfs(pathname, &vfsres) == 0)
+			{
+				result = vfsres.f_frsize;
+				printf("%ld\n", result);
+				return 0;
+			}
+			break;
+		}
+		case _PC_REC_MIN_XFER_SIZE:
+		{
+			struct statvfs vfsres;
+			if(statvfs(pathname, &vfsres) == 0)
+			{
+				result = vfsres.f_bsize;
+				printf("%ld\n", result);
+				return 0;
+			}
+			break;
+		}
+		case _PC_NAME_MAX:
+		{
+			struct statfs fsres;
+			if(statfs(pathname, &fsres) == 0)
+			{
+				result = fsres.f_namelen;
+				printf("%ld\n", result);
+				return 0;
+			}
+			break;
+		}
+		}
+#endif
 		result = pathconf(pathname, path_vars[var].value);
 		if(errno != 0)
 		{
-- 
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