[UNIKRAFT/LIBNEWLIB PATCH] Add support for the uksignal Unikraft internal library.

[Felipe Huici <felipe.huici@xxxxxxxxx>]

From: Mihai Pogonaru <pogonarumihai@xxxxxxxxx>

Signed-off-by: Mihai Pogonaru <pogonarumihai@xxxxxxxxx>
Signed-off-by: Felipe Huici <felipe.huici@xxxxxxxxx>
---
 Makefile.uk      |  4 ++++
 include/signal.h | 11 +++++++++++
 plat.c           |  8 --------
 signal.c         | 42 ++++++++++++++----------------------------
 4 files changed, 29 insertions(+), 36 deletions(-)
 create mode 100644 include/signal.h

diff --git a/Makefile.uk b/Makefile.uk
index 82836e4..bb3b65f 100644
--- a/Makefile.uk
+++ b/Makefile.uk
@@ -136,7 +136,9 @@ LIBNEWLIBGLUE_SRCS-y += $(LIBNEWLIBC_BASE)/resource.c
 LIBNEWLIBGLUE_SRCS-y += $(LIBNEWLIBC_BASE)/pty.c
 LIBNEWLIBGLUE_SRCS-y += $(LIBNEWLIBC_BASE)/locale.c
 LIBNEWLIBGLUE_SRCS-y += $(LIBNEWLIBC_BASE)/dev.c
+ifneq ($(CONFIG_LIBUKSIGNAL),y)
 LIBNEWLIBGLUE_SRCS-y += $(LIBNEWLIBC_BASE)/signal.c
+endif
 LIBNEWLIBGLUE_SRCS-y += $(LIBNEWLIBC_BASE)/link.c
 LIBNEWLIBGLUE_SRCS-y += $(LIBNEWLIBC_BASE)/mntent.c
 LIBNEWLIBGLUE_SRCS-y += $(LIBNEWLIBC_BASE)/syscall.c
@@ -414,9 +416,11 @@ LIBNEWLIBC_SRCS-y += $(LIBNEWLIB_LIBC)/search/bsd_qsort_r.c
 
################################################################################
 # Newlib/libc code -- signal
 
################################################################################
+ifneq ($(CONFIG_LIBUKSIGNAL),y)
 LIBNEWLIBC_SRCS-y += $(LIBNEWLIB_LIBC)/signal/psignal.c
 LIBNEWLIBC_SRCS-y += $(LIBNEWLIB_LIBC)/signal/raise.c
 LIBNEWLIBC_SRCS-y += $(LIBNEWLIB_LIBC)/signal/signal.c
+endif
 
 
################################################################################
 # Newlib/libc code -- stdio
diff --git a/include/signal.h b/include/signal.h
new file mode 100644
index 0000000..778dec1
--- /dev/null
+++ b/include/signal.h
@@ -0,0 +1,11 @@
+#ifndef _NEWLIB_GLUE_SIGNAL_H_
+#define _NEWLIB_GLUE_SIGNAL_H_
+#include <uk/config.h>
+
+#if CONFIG_LIBUKSIGNAL
+#include <uk/signal.h>
+#else
+#include_next <signal.h>
+#endif
+
+#endif /* _NEWLIB_GLUE_SIGNAL_H_ */
diff --git a/plat.c b/plat.c
index df07dce..2a12801 100644
--- a/plat.c
+++ b/plat.c
@@ -47,14 +47,6 @@ int getentropy(void *buf __unused, size_t buflen __unused)
        return -1;
 }
 
-int sigprocmask(int how __unused, const sigset_t *set __unused,
-               sigset_t *oldset __unused)
-{
-       /* TODO: implement. */
-       errno = ENOTSUP;
-       return -1;
-}
-
 #include <uk/plat/bootstrap.h>
 
 void abort(void)
diff --git a/signal.c b/signal.c
index 4279ee7..f85c2eb 100644
--- a/signal.c
+++ b/signal.c
@@ -37,51 +37,37 @@
 #include <errno.h>
 #include <signal.h>
 
-int sigaction(int sig __unused, const struct sigaction *restrict act __unused,
-             struct sigaction *restrict oact __unused)
+int kill(int pid __unused, int sig __unused)
 {
-       return 0;
+       errno = EINVAL;
+       return -1;
 }
 
-unsigned int alarm(unsigned int seconds __unused)
+int sigaction(int sig __unused, const struct sigaction *restrict act __unused,
+             struct sigaction *restrict oact __unused)
 {
        return 0;
 }
 
-int pause(void)
+int sigprocmask(int how __unused, const sigset_t *set __unused,
+               sigset_t *oldset __unused)
 {
-       return 0;
+       /* TODO: implement. */
+       errno = ENOTSUP;
+       return -1;
 }
 
-int siginterrupt(int sig __unused, int flag __unused)
+unsigned int alarm(unsigned int seconds __unused)
 {
        return 0;
 }
 
-int sigsuspend(const sigset_t *mask)
+int pause(void)
 {
        return 0;
 }
 
-int kill(int pid, int sig __unused)
-{
-       /* TODO check sig */
-       if (pid != UNIKRAFT_PID)
-               errno = ESRCH;
-       return -1;
-}
-
-int killpg(int pgrp, int sig __unused)
-{
-       /* TODO check sig */
-       if (pgrp != UNIKRAFT_PGID)
-               errno = ESRCH;
-       return -1;
-}
-
-int sigaltstack(const stack_t *ss, stack_t *old_ss)
+int siginterrupt(int sig __unused, int flag __unused)
 {
-       WARN_STUBBED();
-       errno = ENOTSUP;
-       return -1;
+       return 0;
 }
-- 
2.20.1