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| -rw-r--r-- | share/man/man9/SYSCALL_MODULE.9 | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/share/man/man9/SYSCALL_MODULE.9 b/share/man/man9/SYSCALL_MODULE.9 index 973adeb..00eb42b 100644 --- a/share/man/man9/SYSCALL_MODULE.9 +++ b/share/man/man9/SYSCALL_MODULE.9 @@ -57,6 +57,8 @@ A pointer to an which saves the offset in .Vt "struct sysent" where the syscall is allocated. +If the location pointed to by offset holds a non 0 number it will be used if possible. +If it holds 0 then one will be assigned. .It Fa new_sysent is a pointer to a structure that specifies the function implementing the syscall and the number of arguments this function needs (see @@ -72,6 +74,17 @@ The argument passed to the callback functions of the .Fa evh event handler when it is called. .El +.Pp +The syscall number assigned to the module can be retrieved using the +.Xr modstat 3 +and +.Xr modfind 3 +library functions in libc. +The MACRO +.Fn SYSCALL_MODULE_HELPER +includes +.Fn SYSCALL_MODULE +and much of its boilerplate code. .Sh EXAMPLES A minimal example for a syscall module can be found in .Pa /usr/share/examples/kld/syscall/module/syscall.c . |
