POSIX-2024: support for O_CLOFORK, SO_CLOFORK

Change-Id: I4f3a961947eefdeafd5a249499899cc92d67c2d1
Reviewed-on: https://review.haiku-os.org/c/haiku/+/9330
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: waddlesplash <[email protected]>

headers/posix/fcntl.h

@@ -21,6 +21,7 @@
 #define F_SETLK         0x0080		/* set locking information */
 #define F_SETLKW        0x0100		/* as above, but waits if blocked */
 #define F_DUPFD_CLOEXEC 0x0200		/* duplicate fd with close on exec set */
+#define F_DUPFD_CLOFORK 0x0400		/* duplicate fd with close on fork set */
 
 /* advisory locking types */
 #define F_RDLCK         0x0040		/* read or shared lock */
@@ -29,6 +30,7 @@
 
 /* file descriptor flags for fcntl() */
 #define FD_CLOEXEC		1			/* close on exec */
+#define FD_CLOFORK		2			/* close on fork */
 
 /* file access modes for open() */
 #define O_RDONLY		0x0000		/* read only */
@@ -57,6 +59,7 @@
 									/* possible */
 #define O_NOCACHE		O_DIRECT
 #define O_DIRECTORY		0x00200000	/* fail if not a directory */
+#define O_CLOFORK		0x00400000	/* close on fork */
 
 /* flags for the *at() functions */
 #define AT_FDCWD		(-100)		/* CWD FD for the *at() functions */

headers/posix/sys/socket.h

@@ -49,6 +49,7 @@ typedef uint8_t sa_family_t;
 
 #define SOCK_NONBLOCK 	0x00040000
 #define SOCK_CLOEXEC 	0x00080000
+#define SOCK_CLOFORK 	0x00100000
 
 /* Socket options for SOL_SOCKET level */
 #define	SOL_SOCKET		-1

headers/private/kernel/fs/fd.h

@@ -94,6 +94,9 @@ extern bool fd_is_file(struct file_descriptor* descriptor);
 extern bool fd_close_on_exec(const struct io_context *context, int fd);
 extern void fd_set_close_on_exec(struct io_context *context, int fd,
 	bool closeFD);
+extern bool fd_close_on_fork(const struct io_context *context, int fd);
+extern void fd_set_close_on_fork(struct io_context *context, int fd,
+	bool closeFD);
 
 static struct io_context *get_current_io_context(bool kernel);
 

headers/private/kernel/vfs.h

@@ -56,6 +56,7 @@ typedef struct io_context {
 	struct file_descriptor **fds;
 	struct select_info **select_infos;
 	uint8		*fds_close_on_exec;
+	uint8		*fds_close_on_fork;
 	struct list node_monitors;
 	uint32		num_monitors;
 	uint32		max_monitors;