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D33555.1786390127.diff
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Index: lib/libc/sys/fcntl.2
===================================================================
--- lib/libc/sys/fcntl.2
+++ lib/libc/sys/fcntl.2
@@ -28,7 +28,7 @@
.\" @(#)fcntl.2 8.2 (Berkeley) 1/12/94
.\" $FreeBSD$
.\"
-.Dd December 7, 2021
+.Dd December 20, 2021
.Dt FCNTL 2
.Os
.Sh NAME
@@ -207,6 +207,29 @@
member of the passed structure must be initialized with the sizeof of
.Vt struct kinfo_file ,
to allow for the interface versioning and evolution.
+The
+.Va kf_path
+contains a path to the same object that is referenced by file
+.Fa fd .
+The path returned is not guaranteed to match the path used to open.
+.Vt The file descriptor, or it could be that the path cannot be recovered, in which case the
+.Va kf_path
+field contains an empty string.
+.It Dv F_GETPATH
+Place a pathname corresponding to
+.Fa fd
+in the buffer pointed by
+.Fa arg .
+.Fa arg
+buffer size must be at least
+.Fa PATH_MAX
+bytes and must be a
+.Fa char * .
+.Va F_GETPATH
+is a wrapper around
+.Va F_KINFO
+.Vt and thus fetches significantly more data than only path.
+.Vt It should be noted that we provide it for compability with NetBSD and macOs.
.El
.Pp
The flags for the
Index: lib/libc/sys/fcntl.c
===================================================================
--- lib/libc/sys/fcntl.c
+++ lib/libc/sys/fcntl.c
@@ -38,8 +38,10 @@
#include <fcntl.h>
#include <stdarg.h>
+#include <string.h>
#include <sys/types.h>
#include <sys/syscall.h>
+#include <sys/user.h>
#include "libc_private.h"
#pragma weak fcntl
@@ -50,6 +52,19 @@
long arg;
va_start(args, cmd);
+
+ if (cmd == F_GETPATH) {
+ struct kinfo_file kif = {.kf_structsize = KINFO_FILE_SIZE};
+ char *buf = va_arg(args, char *);
+ va_end(args);
+
+ int error = fcntl(fd, F_KINFO, &kif);
+ if (error == 0)
+ strcpy(buf, kif.kf_path);
+
+ return (error);
+ }
+
arg = va_arg(args, long);
va_end(args);
Index: sys/sys/fcntl.h
===================================================================
--- sys/sys/fcntl.h
+++ sys/sys/fcntl.h
@@ -271,6 +271,7 @@
#define F_GET_SEALS 20
#define F_ISUNIONSTACK 21 /* Kludge for libc, don't use it. */
#define F_KINFO 22 /* Return kinfo_file for this fd */
+#define F_GETPATH 23 /* Return the path for this fd */
/* Seals (F_ADD_SEALS, F_GET_SEALS). */
#define F_SEAL_SEAL 0x0001 /* Prevent adding sealings */

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