D56362.id175339.diff
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	diff --git a/include/unistd.h b/include/unistd.h
	--- a/include/unistd.h
	+++ b/include/unistd.h
	@@ -326,6 +326,9 @@
	__BEGIN_DECLS
	/* 1003.1-1990 */
	void _exit(int) __dead2;
	+#if __POSIX_VISIBLE >= 202405
	+pid_t _Fork(void);
	+#endif
	int access(const char *, int);
	unsigned int alarm(unsigned int);
	int chdir(const char *);
	@@ -595,7 +598,6 @@
	int unwhiteout(const char *);
	void valloc(size_t); / obsoleted by malloc() */
	int funlinkat(int, const char *, int, int);
	-pid_t _Fork(void);

	#ifndef _OPTRESET_DECLARED
	#define _OPTRESET_DECLARED
	diff --git a/lib/libsys/fork.2 b/lib/libsys/fork.2
	--- a/lib/libsys/fork.2
	+++ b/lib/libsys/fork.2
	@@ -138,6 +138,7 @@
	or
	.Xr rtld 1 )
	are available in the child if forked from multi-threaded parent.
	+.Pp
	In particular, if using dynamic linking, all dynamic symbols used by the
	child after
	.Fn _Fork
	@@ -151,6 +152,7 @@
	or by using each symbol before the
	.Fn _Fork
	call to force the binding.
	+Either of the methods subtly changes the ABI of the resulting binary.
	.Sh RETURN VALUES
	Upon successful completion,
	.Fn fork