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| author | julian <julian@FreeBSD.org> | 2016-12-02 06:27:14 +0000 |
|---|---|---|
| committer | julian <julian@FreeBSD.org> | 2016-12-02 06:27:14 +0000 |
| commit | e97cd1e272f9d4ccd24b2efefa6c93a62a72f615 (patch) | |
| tree | fa8b99fe0c4f9ebfea772eb550310a8ced3c7a94 | |
| parent | e71ec6347aeb2f3e9562d6b7528651ccaf1d7d84 (diff) | |
| download | FreeBSD-src-e97cd1e272f9d4ccd24b2efefa6c93a62a72f615.zip FreeBSD-src-e97cd1e272f9d4ccd24b2efefa6c93a62a72f615.tar.gz | |
MFH: r297012
Add a few details that make it easier to use this macro.
Sponsored by: Panzura inc
| -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 . |
