abstract differences between GNU and Apple xattr functions

src/apk_xattr.h

@@ -0,0 +1,30 @@
+#pragma once
+#include <unistd.h>
+#include <sys/xattr.h>
+
+static inline int apk_fsetxattr(int fd, const char *name, void *value, size_t size)
+{
+#ifdef __APPLE__
+	return fsetxattr(fd, name, value, size, 0, 0);
+#else
+	return fsetxattr(fd, name, value, size, 0);
+#endif
+}
+
+static inline ssize_t apk_fgetxattr(int fd, const char *name, void *value, size_t size)
+{
+#ifdef __APPLE__
+	return fgetxattr(fd, name, value, size, 0, 0);
+#else
+	return fgetxattr(fd, name, value, size);
+#endif
+}
+
+static inline ssize_t apk_flistxattr(int fd, char *namebuf, size_t size)
+{
+#ifdef __APPLE__
+	return flistxattr(fd, namebuf, size, 0);
+#else
+	return flistxattr(fd, namebuf, size);
+#endif
+}

src/fs_fsys.c

@@ -9,9 +9,9 @@
 
 #include <unistd.h>
 #include <sys/stat.h>
-#include <sys/xattr.h>
 
 #include "apk_fs.h"
+#include "apk_xattr.h"
 
 #define TMPNAME_MAX (PATH_MAX + 64)
 
@@ -186,7 +186,7 @@ static int fsys_file_extract(struct apk_ctx *ac, const struct apk_file_info *fi,
 		fd = openat(atfd, fn, O_RDWR);
 		if (fd >= 0) {
 			foreach_array_item(xattr, fi->xattrs) {
-				if (fsetxattr(fd, xattr->name, xattr->value.ptr, xattr->value.len, 0) < 0) {
+				if (apk_fsetxattr(fd, xattr->name, xattr->value.ptr, xattr->value.len) < 0) {
 					r = -errno;
 					if (r != -ENOTSUP) break;
 				}

src/io.c

@@ -17,7 +17,6 @@
 #include <sys/mman.h>
 #include <sys/wait.h>
 #include <sys/stat.h>
-#include <sys/xattr.h>
 #include <pwd.h>
 #include <grp.h>
 #include <limits.h>
@@ -25,6 +24,7 @@
 #include "apk_defines.h"
 #include "apk_io.h"
 #include "apk_crypto.h"
+#include "apk_xattr.h"
 
 #if defined(__GLIBC__) || defined(__UCLIBC__)
 #define HAVE_FGETPWENT_R
@@ -786,12 +786,12 @@ int apk_fileinfo_get(int atfd, const char *filename, unsigned int flags,
 		r = 0;
 		fd = openat(atfd, filename, O_RDONLY);
 		if (fd >= 0) {
-			len = flistxattr(fd, buf, sizeof(buf));
+			len = apk_flistxattr(fd, buf, sizeof(buf));
 			if (len > 0) {
 				struct apk_xattr_array *xattrs = NULL;
 				apk_xattr_array_init(&xattrs);
 				for (i = 0; i < len; i += strlen(&buf[i]) + 1) {
-					vlen = fgetxattr(fd, &buf[i], val, sizeof(val));
+					vlen = apk_fgetxattr(fd, &buf[i], val, sizeof(val));
 					if (vlen < 0) {
 						r = errno;
 						if (r == ENODATA) continue;