diff options
| author | Aleksandar Markovic <aleksandar.markovic@imgtec.com> | 2016-09-22 18:56:50 +0200 |
|---|---|---|
| committer | Riku Voipio <riku.voipio@linaro.org> | 2016-10-21 15:19:39 +0300 |
| commit | 19f59bcef91cd4abc04d10c9ecbf5183b71f1b06 (patch) | |
| tree | 0ebd24f32a475fe2ac3ddf9177798b486c6ce9bf /linux-user/strace.list | |
| parent | da158a86c407fa7b9da848b571356a26809d8df9 (diff) | |
linux-user: Add support for adjtimex() syscall
This patch implements Qemu user mode adjtimex() syscall support.
Syscall adjtimex() reads and optionally sets parameters for a clock
adjustment algorithm used in network synchonization or similar scenarios.
Its declaration is:
int adjtimex(struct timex *buf);
The correspondent source code in the Linux kernel is at kernel/time.c,
line 206.
The Qemu implementation is based on invocation of host's adjtimex(), and
its key part is in the "TARGET_NR_adjtimex" case segment of the the main
switch statement of the function do_syscall(), in linux-user/syscalls.c. All
necessary conversions of the data structures from target to host and from
host to target are covered. Two new functions, target_to_host_timex() and
host_to_target_timex(), are provided for the purpose of such conversions.
For that purpose, the support for related structure "timex" had tp be added
to the file linux-user/syscall_defs.h, based on its definition in Linux
kernel. Also, the relevant support for "-strace" Qemu option is included
in files linux-user/strace.c and linux-user/strace.list.
This patch also fixes failures of LTP tests adjtimex01 and adjtimex02, if
executed in Qemu user mode.
Signed-off-by: Aleksandar Rikalo <aleksandar.rikalo@imgtec.com>
Signed-off-by: Aleksandar Markovic <aleksandar.markovic@imgtec.com>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Diffstat (limited to 'linux-user/strace.list')
| -rw-r--r-- | linux-user/strace.list | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/linux-user/strace.list b/linux-user/strace.list index 608f7e0932..f6dd044d76 100644 --- a/linux-user/strace.list +++ b/linux-user/strace.list @@ -19,7 +19,8 @@ { TARGET_NR_add_key, "add_key" , NULL, NULL, NULL }, #endif #ifdef TARGET_NR_adjtimex -{ TARGET_NR_adjtimex, "adjtimex" , NULL, NULL, NULL }, +{ TARGET_NR_adjtimex, "adjtimex" , "%s(%p)", NULL, + print_syscall_ret_adjtimex }, #endif #ifdef TARGET_NR_afs_syscall { TARGET_NR_afs_syscall, "afs_syscall" , NULL, NULL, NULL }, |