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authorAleksandar Markovic <aleksandar.markovic@imgtec.com>2016-09-22 18:56:50 +0200
committerRiku Voipio <riku.voipio@linaro.org>2016-10-21 15:19:39 +0300
commit19f59bcef91cd4abc04d10c9ecbf5183b71f1b06 (patch)
tree0ebd24f32a475fe2ac3ddf9177798b486c6ce9bf /linux-user/strace.c
parentda158a86c407fa7b9da848b571356a26809d8df9 (diff)
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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.c')
-rw-r--r--linux-user/strace.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/linux-user/strace.c b/linux-user/strace.c
index 1e51360..f37b386 100644
--- a/linux-user/strace.c
+++ b/linux-user/strace.c
@@ -577,6 +577,52 @@ print_syscall_ret_newselect(const struct syscallname *name, abi_long ret)
}
#endif
+/* special meanings of adjtimex()' non-negative return values */
+#define TARGET_TIME_OK 0 /* clock synchronized, no leap second */
+#define TARGET_TIME_INS 1 /* insert leap second */
+#define TARGET_TIME_DEL 2 /* delete leap second */
+#define TARGET_TIME_OOP 3 /* leap second in progress */
+#define TARGET_TIME_WAIT 4 /* leap second has occurred */
+#define TARGET_TIME_ERROR 5 /* clock not synchronized */
+static void
+print_syscall_ret_adjtimex(const struct syscallname *name, abi_long ret)
+{
+ const char *errstr = NULL;
+
+ gemu_log(" = ");
+ if (ret < 0) {
+ gemu_log("-1 errno=%d", errno);
+ errstr = target_strerror(-ret);
+ if (errstr) {
+ gemu_log(" (%s)", errstr);
+ }
+ } else {
+ gemu_log(TARGET_ABI_FMT_ld, ret);
+ switch (ret) {
+ case TARGET_TIME_OK:
+ gemu_log(" TIME_OK (clock synchronized, no leap second)");
+ break;
+ case TARGET_TIME_INS:
+ gemu_log(" TIME_INS (insert leap second)");
+ break;
+ case TARGET_TIME_DEL:
+ gemu_log(" TIME_DEL (delete leap second)");
+ break;
+ case TARGET_TIME_OOP:
+ gemu_log(" TIME_OOP (leap second in progress)");
+ break;
+ case TARGET_TIME_WAIT:
+ gemu_log(" TIME_WAIT (leap second has occurred)");
+ break;
+ case TARGET_TIME_ERROR:
+ gemu_log(" TIME_ERROR (clock not synchronized)");
+ break;
+ }
+ }
+
+ gemu_log("\n");
+}
+
UNUSED static struct flags access_flags[] = {
FLAG_GENERIC(F_OK),
FLAG_GENERIC(R_OK),