diff options
Diffstat (limited to 'sys/kern/kern_exec.c')
| -rw-r--r-- | sys/kern/kern_exec.c | 71 |
1 files changed, 66 insertions, 5 deletions
diff --git a/sys/kern/kern_exec.c b/sys/kern/kern_exec.c index a788629..d30d9c2 100644 --- a/sys/kern/kern_exec.c +++ b/sys/kern/kern_exec.c @@ -23,7 +23,7 @@ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * - * $Id: kern_exec.c,v 1.85 1998/08/24 08:39:38 dfr Exp $ + * $Id: kern_exec.c,v 1.86 1998/09/04 08:06:55 dfr Exp $ */ #include <sys/param.h> @@ -41,6 +41,7 @@ #include <sys/wait.h> #include <sys/proc.h> #include <sys/pioctl.h> +#include <sys/malloc.h> #include <sys/namei.h> #include <sys/sysent.h> #include <sys/shm.h> @@ -71,11 +72,10 @@ SYSCTL_INTPTR(_kern, KERN_PS_STRINGS, ps_strings, 0, &ps_strings, 0, ""); static caddr_t usrstack = (caddr_t)USRSTACK; SYSCTL_INTPTR(_kern, KERN_USRSTACK, usrstack, 0, &usrstack, 0, ""); /* - * execsw_set is constructed for us by the linker. Each of the items - * is a pointer to a `const struct execsw', hence the double pointer here. + * Each of the items is a pointer to a `const struct execsw', hence the + * double pointer here. */ -static const struct execsw **execsw = - (const struct execsw **)&execsw_set.ls_items[0]; +static const struct execsw **execsw; #ifndef _SYS_SYSPROTO_H_ struct execve_args { @@ -695,3 +695,64 @@ exec_check_permissions(imgp) return (0); } + +/* + * Exec handler registration + */ +int +exec_register(execsw_arg) + const struct execsw *execsw_arg; +{ + const struct execsw **es, **xs, **newexecsw; + int count = 2; /* New slot and trailing NULL */ + + if (execsw) + for (es = execsw; *es; es++) + count++; + newexecsw = malloc(count * sizeof(*es), M_TEMP, M_WAITOK); + if (newexecsw == NULL) + return ENOMEM; + xs = newexecsw; + if (execsw) + for (es = execsw; *es; es++) + *xs++ = *es; + *xs++ = execsw_arg; + *xs = NULL; + if (execsw) + free(execsw, M_TEMP); + execsw = newexecsw; + return 0; +} + +int +exec_unregister(execsw_arg) + const struct execsw *execsw_arg; +{ + const struct execsw **es, **xs, **newexecsw; + int count = 1; + + if (execsw == NULL) + panic("unregister with no handlers left?\n"); + + for (es = execsw; *es; es++) { + if (*es == execsw_arg) + break; + } + if (*es == NULL) + return ENOENT; + for (es = execsw; *es; es++) + if (*es != execsw_arg) + count++; + newexecsw = malloc(count * sizeof(*es), M_TEMP, M_WAITOK); + if (newexecsw == NULL) + return ENOMEM; + xs = newexecsw; + for (es = execsw; *es; es++) + if (*es != execsw_arg) + *xs++ = *es; + *xs = NULL; + if (execsw) + free(execsw, M_TEMP); + execsw = newexecsw; + return 0; +} |
