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As suggested by Ingo, the "subsystem" parameter is now a string. That allows 

modules to use their module name directly.
Also introduced a whole range of reserved syscall functions in case we want
to add some more.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10458 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler 2004-12-14 17:09:06 +00:00
parent b793d2a2bc
commit dbef8d930c
3 changed files with 29 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
headers/private/kernel/generic_syscall.h
View File

@ -13,10 +13,11 @@
* should be moved to KernelExport.h
*/
typedef status_t (*syscall_hook)(uint32 subsystem, uint32 function, void *buffer, size_t bufferSize);
typedef status_t (*syscall_hook)(const char *subsystem, uint32 function, void *buffer, size_t bufferSize);
/* predefined functions */
#define B_SYSCALL_INFO ~0UL
#define B_RESERVED_SYSCALL_BASE 0x80000000
#define B_SYSCALL_INFO (B_RESERVED_SYSCALL_BASE)
// gets a minimum version uint32, and fills it with the current version on return
/* syscall flags */
@ -28,9 +29,9 @@ typedef status_t (*syscall_hook)(uint32 subsystem, uint32 function, void *buffer
extern "C" {
#endif
status_t register_generic_syscall(uint32 subsystem, syscall_hook hook,
status_t register_generic_syscall(const char *subsystem, syscall_hook hook,
uint32 version, uint32 flags);
status_t unregister_generic_syscall(uint32 subsystem, uint32 version);
status_t unregister_generic_syscall(const char *subsystem, uint32 version);
#ifdef __cplusplus
}

2
headers/private/kernel/syscalls.h
View File

@ -34,7 +34,7 @@ struct dirent;
#endif
extern int _kern_null();
extern status_t _kern_generic_syscall(uint32 subsystem, uint32 function,
extern status_t _kern_generic_syscall(const char *subsystem, uint32 function,
void *buffer, size_t bufferSize);
extern int _kern_getrlimit(int resource, struct rlimit * rlp);

32
src/kernel/core/syscalls.c
View File

@ -33,14 +33,16 @@
#include <user_atomic.h>
#include <safemode.h>
#include <arch/system_info.h>
#include <malloc.h>
#include <string.h>
typedef struct generic_syscall generic_syscall;
struct generic_syscall {
list_link link;
uint32 subsystem;
char subsystem[B_FILE_NAME_LENGTH];
syscall_hook hook;
uint32 version;
uint32 flags;
@ -52,14 +54,14 @@ static struct list sGenericSyscalls;
static generic_syscall *
find_generic_syscall(uint32 subsystem)
find_generic_syscall(const char *subsystem)
{
generic_syscall *syscall = NULL;
ASSERT_LOCKED_MUTEX(&sGenericSyscallLock);
while ((syscall = list_get_next_item(&sGenericSyscalls, syscall)) != NULL) {
if (syscall->subsystem == subsystem)
if (!strcmp(syscall->subsystem, subsystem))
return syscall;
}
@ -75,12 +77,18 @@ find_generic_syscall(uint32 subsystem)
*/
static inline status_t
_user_generic_syscall(uint32 subsystem, uint32 function, void *buffer, size_t bufferSize)
_user_generic_syscall(const char *userSubsystem, uint32 function,
void *buffer, size_t bufferSize)
{
char subsystem[B_FILE_NAME_LENGTH];
generic_syscall *syscall;
status_t status;
dprintf("generic_syscall(subsystem = %lu, function = %lu)\n", subsystem, function);
if (!IS_USER_ADDRESS(userSubsystem)
|| user_strlcpy(subsystem, userSubsystem, sizeof(subsystem)) < B_OK)
return B_BAD_ADDRESS;
//dprintf("generic_syscall(subsystem = \"%s\", function = %lu)\n", subsystem, function);
mutex_lock(&sGenericSyscallLock);
@ -90,7 +98,13 @@ _user_generic_syscall(uint32 subsystem, uint32 function, void *buffer, size_t bu
goto out;
}
if (function == B_SYSCALL_INFO) {
if (function >= B_RESERVED_SYSCALL_BASE) {
if (function != B_SYSCALL_INFO) {
// this is all we know
status = B_NAME_NOT_FOUND;
goto out;
}
// special info syscall
if (bufferSize != sizeof(uint32))
status = B_BAD_VALUE;
@ -197,7 +211,7 @@ generic_syscall_init(void)
status_t
register_generic_syscall(uint32 subsystem, syscall_hook hook,
register_generic_syscall(const char *subsystem, syscall_hook hook,
uint32 version, uint32 flags)
{
struct generic_syscall *previous, *syscall;
@ -227,7 +241,7 @@ register_generic_syscall(uint32 subsystem, syscall_hook hook,
goto out;
}
syscall->subsystem = subsystem;
strlcpy(syscall->subsystem, subsystem, sizeof(syscall->subsystem));
syscall->hook = hook;
syscall->version = version;
syscall->flags = flags;
@ -246,7 +260,7 @@ out:
status_t
unregister_generic_syscall(uint32 subsystem, uint32 version)
unregister_generic_syscall(const char *subsystem, uint32 version)
{
// ToDo: we should only remove the syscall with the matching version
generic_syscall *syscall;