From a9c58e72a34e957fbff6b5020e1a29e32d269115 Mon Sep 17 00:00:00 2001
From: Richard Lau <riclau@uk.ibm.com>
Date: Tue, 17 Mar 2020 16:38:32 -0400
Subject: [PATCH] zos: fix non-Release builds

z/OS doesn't support POSIX semaphores. On Release builds the code
paths that reference POSIX semaphore functions (e.g. sem_init())
are optimized away so linking succeeds but on a non-Release build
the references to the unavailable functions result in unresolved
symbol errors.

Stub the unavailable POSIX semaphore functions on z/OS as so the
code can link on non-Release builds.

PR-URL: https://github.com/libuv/libuv/pull/2737
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
---
 src/unix/os390-syscalls.c | 25 +++++++++++++++++++++++++
 src/unix/os390-syscalls.h |  5 +++++
 2 files changed, 30 insertions(+)

diff --git a/src/unix/os390-syscalls.c b/src/unix/os390-syscalls.c
index 190ff1be..53dca91f 100644
--- a/src/unix/os390-syscalls.c
+++ b/src/unix/os390-syscalls.c
@@ -556,3 +556,28 @@ size_t strnlen(const char* str, size_t maxlen) {
   else
     return p - str;
 }
+
+
+int sem_init(UV_PLATFORM_SEM_T* semid, int pshared, unsigned int value) {
+  UNREACHABLE();
+}
+
+
+int sem_destroy(UV_PLATFORM_SEM_T* semid) {
+  UNREACHABLE();
+}
+
+
+int sem_post(UV_PLATFORM_SEM_T* semid) {
+  UNREACHABLE();
+}
+
+
+int sem_trywait(UV_PLATFORM_SEM_T* semid) {
+  UNREACHABLE();
+}
+
+
+int sem_wait(UV_PLATFORM_SEM_T* semid) {
+  UNREACHABLE();
+}
diff --git a/src/unix/os390-syscalls.h b/src/unix/os390-syscalls.h
index 5130457c..86416bbc 100644
--- a/src/unix/os390-syscalls.h
+++ b/src/unix/os390-syscalls.h
@@ -65,5 +65,10 @@ int scandir(const char* maindir, struct dirent*** namelist,
 char *mkdtemp(char* path);
 ssize_t os390_readlink(const char* path, char* buf, size_t len);
 size_t strnlen(const char* str, size_t maxlen);
+int sem_init(UV_PLATFORM_SEM_T* semid, int pshared, unsigned int value);
+int sem_destroy(UV_PLATFORM_SEM_T* semid);
+int sem_post(UV_PLATFORM_SEM_T* semid);
+int sem_trywait(UV_PLATFORM_SEM_T* semid);
+int sem_wait(UV_PLATFORM_SEM_T* semid);
 
 #endif /* UV_OS390_SYSCALL_H_ */