Differential D27572 Diff 80586 sys/kern/kern_syscalls.c

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sys/kern/kern_syscalls.c

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#include <sys/resourcevar.h>		#include <sys/resourcevar.h>
#include <sys/sx.h>		#include <sys/sx.h>
#include <sys/syscall.h>		#include <sys/syscall.h>
#include <sys/sysent.h>		#include <sys/sysent.h>
#include <sys/sysproto.h>		#include <sys/sysproto.h>
#include <sys/systm.h>		#include <sys/systm.h>
#include <machine/atomic.h>		#include <machine/atomic.h>

		int __read_frequently syscall_slow_path_required = 0;

/*		/*
* Acts like "nosys" but can be identified in sysent for dynamic call		* Acts like "nosys" but can be identified in sysent for dynamic call
* number assignment for a limited number of calls.		* number assignment for a limited number of calls.
*		*
* Place holder for system call slots reserved for loadable modules.		* Place holder for system call slots reserved for loadable modules.
*/		*/
int		int
lkmnosys(struct thread td, struct nosys_args args)		lkmnosys(struct thread td, struct nosys_args args)
▲ Show 20 Lines • Show All 203 Lines • ▼ Show 20 Lines	kern_syscall_helper_unregister(struct sysent *sysents,
struct syscall_helper_data *sd1;		struct syscall_helper_data *sd1;

for (sd1 = sd; sd1->registered != 0; sd1++) {		for (sd1 = sd; sd1->registered != 0; sd1++) {
kern_syscall_deregister(sysents, sd1->syscall_no,		kern_syscall_deregister(sysents, sd1->syscall_no,
&sd1->old_sysent);		&sd1->old_sysent);
sd1->registered = 0;		sd1->registered = 0;
}		}
return (0);		return (0);
		}

		void
		syscall_slow_down(int id)
		{

		atomic_set_int(&syscall_slow_path_required, id);
		}

		void
		syscall_speed_up(int id)
		{

		atomic_clear_int(&syscall_slow_path_required, id);
}		}