From: Benoit Canet <benoit.canet.cont...@gmail.com>
Committer: Nadav Har'El <n...@scylladb.com>
Branch: master
syscall: implement rt_sigaction
This is one of the first syscall used by go binaries.
The kernel syscall have some custom layout that must
be convert forth and back to and from libc. Do it.
Signed-off-by: Benoît Canet <ben...@scylladb.com>
Message-Id: <1472475979-24981-2-git-send-email-ben...@scylladb.com>
---
diff --git a/linux.cc b/linux.cc
--- a/linux.cc
+++ b/linux.cc
@@ -17,6 +17,7 @@
#include <syscall.h>
#include <stdarg.h>
#include <errno.h>
+#include <signal.h>
#include <time.h>
#include <sys/epoll.h>
#include <sys/eventfd.h>
@@ -26,6 +27,8 @@
#include <unordered_map>
+#include <musl/src/internal/ksigaction.h>
+
extern "C" long gettid()
{
return sched::thread::current()->id();
@@ -263,6 +266,31 @@ long long_mmap(void *addr, size_t length, int prot,
int flags, int fd, off_t off
return fn(arg1, arg2, arg3, arg4, arg5, arg6); \
} while (0)
+int rt_sigaction(int sig, const struct k_sigaction * act, struct
k_sigaction * oact, size_t sigsetsize)
+{
+ struct sigaction libc_act, libc_oact, *libc_act_p = nullptr;
+ memset(&libc_act, 0, sizeof(libc_act));
+ memset(&libc_oact, 0, sizeof(libc_act));
+
+ if (act) {
+ libc_act.sa_handler = act->handler;
+ libc_act.sa_flags = act->flags & ~SA_RESTORER;
+ libc_act.sa_restorer = nullptr;
+ memcpy(&libc_act.sa_mask, &act->mask, sizeof(libc_act.sa_mask));
+ libc_act_p = &libc_act;
+ }
+
+ int ret = sigaction(sig, libc_act_p, &libc_oact);
+
+ if (oact) {
+ oact->handler = libc_oact.sa_handler;
+ oact->flags = libc_oact.sa_flags;
+ oact->restorer = nullptr;
+ memcpy(oact->mask, &libc_oact.sa_mask, sizeof(oact->mask));
+ }
+
+ return ret;
+}
long syscall(long number, ...)
{
@@ -284,6 +312,7 @@ long syscall(long number, ...)
SYSCALL3(sched_getaffinity_syscall, pid_t, unsigned, unsigned long *);
SYSCALL6(long_mmap, void *, size_t, int, int, int, off_t);
SYSCALL2(munmap, void *, size_t);
+ SYSCALL4(rt_sigaction, int, const struct k_sigaction *, struct
k_sigaction *, size_t);
}
debug_always("syscall(): unimplemented system call %d\n", number);
--
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