[vala/tintou/posix-pathconf] posix: Add pathconf and fpathconf bindings

[Corentin Noël <corentinnoel src gnome org>]

commit 11b0fec74c200e7d7a7daf0177b1c65cf552beab
Author: Corentin Noël <corentin elementary io>
Date:   Tue Mar 17 12:19:22 2020 +0100

    posix: Add pathconf and fpathconf bindings
    
    Also bind the named constants to use them.

 vapi/posix.vapi | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
---
diff --git a/vapi/posix.vapi b/vapi/posix.vapi
index 63eab169e..e6f0cf6be 100644
--- a/vapi/posix.vapi
+++ b/vapi/posix.vapi
@@ -2674,6 +2674,69 @@ namespace Posix {
        [CCode (cheader_filename = "unistd.h", feature_test_macro = "_GNU_SOURCE")]
        public int faccessat (int dirfd, string pathname, int mode, int flags);
 
+       /**
+        * Gets a value for the configuration option name for the open file
+        * descriptor fd.
+        */
+       [CCode (cheader_filename = "unistd.h")]
+       public long fpathconf (int fd, Posix.PathConfName name);
+
+       /**
+        * Gets a value for the configuration option name for the filename path.
+        */
+       [CCode (cheader_filename = "unistd.h")]
+       public long pathconf (string path, Posix.PathConfName name);
+
+       [CCode (cname = "int", cprefix = "_PC_", has_type_id = false, cheader_filename = "unistd.h")]
+       public enum PathConfName {
+               /**
+                * Returns the maximum number of links to the file. If fd or path refer
+                * to a directory, then the value applies to the whole directory.
+                */
+               LINK_MAX,
+               /**
+                * Returns the maximum length of a formatted input line, where fd or
+                * path must refer to a terminal.
+                */
+               MAX_CANON,
+               /**
+                * Returns the maximum length of an input line, where fd or path must
+                * refer to a terminal.
+                */
+               MAX_INPUT,
+               /**
+                * Returns the maximum length of a filename in the directory path or fd
+                * that the process is allowed to create.
+                */
+               NAME_MAX,
+               /**
+                * Returns the maximum length of a relative pathname when path or fd is
+                * the current working directory.
+                */
+               PATH_MAX,
+               /**
+                * Returns the size of the pipe buffer, where fd must refer to a pipe or
+                * FIFO and path must refer to a FIFO.
+                */
+               PIPE_BUF,
+               /**
+                * Returns nonzero if the chown call may not be used on this file. If fd
+                * or path refer to a directory, then this applies to all files in that
+                * directory.
+                */
+               CHOWN_RESTRICTED,
+               /**
+                * Returns nonzero if accessing filenames longer than
+                * #Posix.PathConfName.NAME_MAX generates an error.
+                */
+               NO_TRUNC,
+               /**
+                * Returns nonzero if special character processing can be disabled,
+                * where fd or path must refer to a terminal.
+                */
+               VDISABLE
+       }
+
        [CCode (cheader_filename = "unistd.h")]
        public uint alarm (uint seconds);
        [CCode (cheader_filename = "unistd.h")]