syscalls: normalize _exit(2) declerations

exit(3) is implemented by the runtime and performs a number of shutdown
actions before ultimately calling _exit(2) to terminate the program.  We
historically named the syscall table entry `exit` rather than `_exit`,
but this requires special handling in libc/libsys to cause the `_exit`
symbol to exist while implementing `exit` in libc.

Declare the syscall as `_exit` and flow that through the system.

Because syscall(SYS_exit, code) is fairly widely used, allow a
configured extra line in syscall.h to define SYS_exit to SYS__exit.

I've found no external uses of __sys_exit() so I've not bothered to
create a compatability version of this private symbol.

Reviewed by:	imp, kib, emaste
Differential Revision:	https://reviews.freebsd.org/D51672

This commit is contained in:

Brooks Davis

2025-08-08 10:30:16 +01:00

parent fd4cdc438b

commit e7e964cb2e

8 changed files with 12 additions and 7 deletions

									
										lib/libsys/Makefile.sys
									
		-1
	
												View File
												
				@@ -52,7 +52,6 @@ STATICOBJS+=	interposing_table.o

				PSEUDO= \

					__realpathat \

					clock_gettime \

					exit \

					getlogin \

					gettimeofday \

					sched_getcpu