Clean up fpathconf(3)/pathconf(3).
fpathconf(3) and pathconf(3) can share code. There's no such
header file as <pathconf.h>. glibc/POSIX and BSD disagree about where
the _POSIX_* definitions should go.
Change-Id: I4a67f1595c9f5fbb26700a131178eedebd6bf712
diff --git a/libc/bionic/pathconf.cpp b/libc/bionic/pathconf.cpp
new file mode 100644
index 0000000..de9e022
--- /dev/null
+++ b/libc/bionic/pathconf.cpp
@@ -0,0 +1,152 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <unistd.h>
+
+#include <errno.h>
+#include <sys/limits.h>
+#include <sys/vfs.h>
+
+static long __filesizebits(const struct statfs& s) {
+ switch (s.f_type) {
+ case JFFS2_SUPER_MAGIC:
+ case MSDOS_SUPER_MAGIC:
+ case NCP_SUPER_MAGIC:
+ return 32;
+ }
+ // There won't be any new 32-bit file systems.
+ return 64;
+}
+
+static long __link_max(const struct statfs& s) {
+ // These constant values were taken from kernel headers.
+ // They're not available in uapi headers.
+ switch (s.f_type) {
+ case EXT2_SUPER_MAGIC:
+ return 32000;
+ case MINIX_SUPER_MAGIC:
+ return 250;
+ case MINIX2_SUPER_MAGIC:
+ return 65530;
+ case REISERFS_SUPER_MAGIC:
+ return 0xffff - 1000;
+ case UFS_MAGIC:
+ return 32000;
+ }
+ return LINK_MAX;
+}
+
+static long __2_symlinks(const struct statfs& s) {
+ switch (s.f_type) {
+ case ADFS_SUPER_MAGIC:
+ case BFS_MAGIC:
+ case CRAMFS_MAGIC:
+ case EFS_SUPER_MAGIC:
+ case MSDOS_SUPER_MAGIC:
+ case QNX4_SUPER_MAGIC:
+ return 0;
+ }
+ return 1;
+}
+
+static long __pathconf(const struct statfs& s, int name) {
+ switch (name) {
+ case _PC_FILESIZEBITS:
+ return __filesizebits(s);
+
+ case _PC_LINK_MAX:
+ return __link_max(s);
+
+ case _PC_MAX_CANON:
+ return MAX_CANON;
+
+ case _PC_MAX_INPUT:
+ return MAX_INPUT;
+
+ case _PC_NAME_MAX:
+ return s.f_namelen;
+
+ case _PC_PATH_MAX:
+ return PATH_MAX;
+
+ case _PC_PIPE_BUF:
+ return PIPE_BUF;
+
+ case _PC_2_SYMLINKS:
+ return __2_symlinks(s);
+
+#if 0
+ case _PC_ALLOC_SIZE_MIN:
+ case _PC_REC_INCR_XFER_SIZE:
+ case _PC_REC_MAX_XFER_SIZE:
+ case _PC_REC_MIN_XFER_SIZE:
+ case _PC_REC_XFER_ALIGN:
+#endif
+
+ case _PC_SYMLINK_MAX:
+ return -1; /* no limit */
+
+ case _PC_CHOWN_RESTRICTED:
+ return _POSIX_CHOWN_RESTRICTED;
+
+ case _PC_NO_TRUNC:
+ return _POSIX_NO_TRUNC;
+
+ case _PC_VDISABLE:
+ return _POSIX_VDISABLE;
+
+ case _PC_ASYNC_IO:
+ return -1;
+
+ case _PC_PRIO_IO:
+ return -1;
+
+ case _PC_SYNC_IO:
+ return -1;
+
+ default:
+ errno = EINVAL;
+ return -1;
+ }
+}
+
+long pathconf(const char* path, int name) {
+ struct statfs sb;
+ if (statfs(path, &sb) == -1) {
+ return -1;
+ }
+ return __pathconf(sb, name);
+}
+
+long fpathconf(int fd, int name) {
+ struct statfs sb;
+ if (fstatfs(fd, &sb) == -1) {
+ return -1;
+ }
+ return __pathconf(sb, name);
+}