Add pathconf(3).

libc/Makefile

@@ -220,6 +220,7 @@ mktemp.o \
 on_exit.o \
 openat.o \
 open.o \
+pathconf.o \
 pipe.o \
 poll.o \
 popen.o \

libc/include/unistd.h

@@ -61,7 +61,27 @@ __BEGIN_DECLS
 
 /* TODO: F_* is missing here. */
 
-/* TODO: _PC_* is missing here. */
+#define _PC_2_SYMLINKS 1
+#define _PC_ALLOC_SIZE_MIN 2
+#define _PC_ASYNC_IO 3
+#define _PC_CHOWN_RESTRICTED 4
+#define _PC_FILESIZEBITS 5
+#define _PC_LINK_MAX 6
+#define _PC_MAX_CANON 7
+#define _PC_MAX_INPUT 8
+#define _PC_NAME_MAX 9
+#define _PC_NO_TRUNC 10
+#define _PC_PATH_MAX 11
+#define _PC_PIPE_BUF 12
+#define _PC_PRIO_IO 13
+#define _PC_REC_INCR_XFER_SIZE 14
+#define _PC_REC_MAX_XFER_SIZE 15
+#define _PC_REC_MIN_XFER_SIZE 16
+#define _PC_REC_XFER_ALIGN 17
+#define _PC_SYMLINK_MAX 18
+#define _PC_SYNC_IO 19
+#define _PC_TIMESTAMP_RESOLUTION 20
+#define _PC_VDISABLE 21
 
 /* TODO: _SC_* is missing here. */
 
@@ -104,7 +124,6 @@ pid_t getpgrp(void);
 pid_t getsid(pid_t);
 int lockf(int, int, off_t);
 int nice(int);
-long pathconf(const char*, int);
 int pause(void);
 int setpgid(pid_t, pid_t);
 int setregid(gid_t, gid_t);
@@ -161,6 +180,7 @@ int lchown(const char*, uid_t, gid_t);
 int link(const char*, const char*);
 int linkat(int, const char*, int, const char*, int);
 off_t lseek(int, off_t, int);
+long pathconf(const char*, int);
 int pipe(int [2]);
 ssize_t pread(int, void*, size_t, off_t);
 ssize_t pwrite(int, const void*, size_t, off_t);

libc/pathconf.cpp

@@ -0,0 +1,39 @@
+/*******************************************************************************
+
+    Copyright(C) Jonas 'Sortie' Termansen 2013.
+
+    This file is part of the Sortix C Library.
+
+    The Sortix C Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or (at your
+    option) any later version.
+
+    The Sortix C Library is distributed in the hope that it will be useful, but
+    WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+    or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
+
+    pathconf.cpp
+    Get configurable pathname variables.
+
+*******************************************************************************/
+
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+
+extern "C" long pathconf(const char* path, int name)
+{
+	switch ( name )
+	{
+	case _PC_PATH_MAX: return -1; // Unbounded
+	default:
+		fprintf(stderr, "%s:%u warning: %s(\"%s\", %i) is unsupported\n",
+		        __FILE__, __LINE__, __func__, path, name);
+		return errno = EINVAL, -1;
+	}
+}