Make more compatibility improvements

libc/runtime/fpathconf.c

@@ -0,0 +1,53 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2022 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ Permission to use, copy, modify, and/or distribute this software for         │
+│ any purpose with or without fee is hereby granted, provided that the         │
+│ above copyright notice and this permission notice appear in all copies.      │
+│                                                                              │
+│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
+│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
+│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
+│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
+│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
+│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
+│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
+│ PERFORMANCE OF THIS SOFTWARE.                                                │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/errno.h"
+#include "libc/limits.h"
+#include "libc/runtime/pathconf.h"
+#include "libc/sysv/consts/_posix.h"
+#include "libc/sysv/consts/limits.h"
+#include "libc/sysv/errfuns.h"
+
+long fpathconf(int fd, int name) {
+  if (name == _PC_LINK_MAX) return _POSIX_LINK_MAX;
+  if (name == _PC_MAX_CANON) return _POSIX_MAX_CANON;
+  if (name == _PC_MAX_INPUT) return _POSIX_MAX_INPUT;
+  if (name == _PC_NAME_MAX) return NAME_MAX;
+  if (name == _PC_PATH_MAX) return PATH_MAX;
+  if (name == _PC_PIPE_BUF) return PIPE_BUF;
+  if (name == _PC_CHOWN_RESTRICTED) return 1;
+  if (name == _PC_NO_TRUNC) return 1;
+  if (name == _PC_VDISABLE) return 0;
+  if (name == _PC_SYNC_IO) return 1;
+  if (name == _PC_ASYNC_IO) return -1;
+  if (name == _PC_PRIO_IO) return -1;
+  if (name == _PC_SOCK_MAXBUF) return -1;
+  if (name == _PC_FILESIZEBITS) return FILESIZEBITS;
+  if (name == _PC_REC_INCR_XFER_SIZE) return 4096;
+  if (name == _PC_REC_MAX_XFER_SIZE) return 4096;
+  if (name == _PC_REC_MIN_XFER_SIZE) return 4096;
+  if (name == _PC_REC_XFER_ALIGN) return 4096;
+  if (name == _PC_ALLOC_SIZE_MIN) return 4096;
+  if (name == _PC_SYMLINK_MAX) return -1;
+  if (name == _PC_2_SYMLINKS) return 1;
+  return einval();
+}
+
+long pathconf(const char *path, int name) {
+  return fpathconf(-1, name);
+}

libc/runtime/pathconf.h

@@ -0,0 +1,34 @@
+#ifndef COSMOPOLITAN_LIBC_RUNTIME_PATHCONF_H_
+#define COSMOPOLITAN_LIBC_RUNTIME_PATHCONF_H_
+
+#define _PC_LINK_MAX           0
+#define _PC_MAX_CANON          1
+#define _PC_MAX_INPUT          2
+#define _PC_NAME_MAX           3
+#define _PC_PATH_MAX           4
+#define _PC_PIPE_BUF           5
+#define _PC_CHOWN_RESTRICTED   6
+#define _PC_NO_TRUNC           7
+#define _PC_VDISABLE           8
+#define _PC_SYNC_IO            9
+#define _PC_ASYNC_IO           10
+#define _PC_PRIO_IO            11
+#define _PC_SOCK_MAXBUF        12
+#define _PC_FILESIZEBITS       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_ALLOC_SIZE_MIN     18
+#define _PC_SYMLINK_MAX        19
+#define _PC_2_SYMLINKS         20
+
+#if !(__ASSEMBLER__ + __LINKER__ + 0)
+COSMOPOLITAN_C_START_
+
+long fpathconf(int, int);
+long pathconf(const char *, int);
+
+COSMOPOLITAN_C_END_
+#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
+#endif /* COSMOPOLITAN_LIBC_RUNTIME_PATHCONF_H_ */

libc/runtime/runtime.h

@@ -82,8 +82,6 @@ int mprotect(void *, uint64_t, int) privileged;
 int msync(void *, size_t, int);
 void *sbrk(intptr_t);
 int brk(void *);
-long fpathconf(int, int);
-long pathconf(const char *, int);
 int getgroups(int, uint32_t[]);
 long gethostid(void);
 int sethostid(long);