From 69e3476ad5247a11f4b93e29607bb7c1513d3cc4 Mon Sep 17 00:00:00 2001 From: "Zyad A. Ali" Date: Tue, 1 Jun 2021 20:17:06 +0200 Subject: Test system-wide semaphore limits. --- test/syscalls/linux/semaphore.cc | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) (limited to 'test/syscalls/linux/semaphore.cc') diff --git a/test/syscalls/linux/semaphore.cc b/test/syscalls/linux/semaphore.cc index 2ce8f836c..54cbda19d 100644 --- a/test/syscalls/linux/semaphore.cc +++ b/test/syscalls/linux/semaphore.cc @@ -22,12 +22,12 @@ #include #include -#include "gmock/gmock.h" -#include "gtest/gtest.h" #include "absl/base/macros.h" #include "absl/memory/memory.h" #include "absl/synchronization/mutex.h" #include "absl/time/clock.h" +#include "gmock/gmock.h" +#include "gtest/gtest.h" #include "test/util/capability_util.h" #include "test/util/test_util.h" #include "test/util/thread_util.h" @@ -49,6 +49,9 @@ constexpr int kSemAem = 32767; class AutoSem { public: + // Creates a new private semaphore. + AutoSem() : id_(semget(IPC_PRIVATE, 1, 0)) {} + explicit AutoSem(int id) : id_(id) {} ~AutoSem() { if (id_ >= 0) { @@ -101,6 +104,17 @@ TEST(SemaphoreTest, SemGet) { EXPECT_NE(sem3.get(), sem2.get()); } +// Tests system-wide limits for semget. +TEST(SemaphoreTest, SemGetSystemLimits) { + // Exceed number of semaphores per set. + EXPECT_THAT(semget(IPC_PRIVATE, kSemMsl + 1, 0), + SyscallFailsWithErrno(EINVAL)); + + // Exceed system-wide limit for semaphore sets by 1. + AutoSem sems[kSemMni]; + EXPECT_THAT(semget(IPC_PRIVATE, 1, 0), SyscallFailsWithErrno(ENOSPC)); +} + // Tests simple operations that shouldn't block in a single-thread. TEST(SemaphoreTest, SemOpSingleNoBlock) { AutoSem sem(semget(IPC_PRIVATE, 1, 0600 | IPC_CREAT)); -- cgit v1.2.3