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Sat, 26 Jul 2025 02:18:46 -0700 (PDT) Received: from eric-wcnlab.tail151456.ts.net ([2001:288:7001:1099:3fec:e266:6de8:8b66]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-b3f7f569d24sm1295025a12.1.2025.07.26.02.18.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 26 Jul 2025 02:18:46 -0700 (PDT) From: Cheng-Yang Chou To: williams@redhat.com, jkacur@redhat.com Cc: linux-rt-users@vger.kernel.org, jserv@ccns.ncku.edu.tw, yphbchou0911@gmail.com Subject: [PATCH v2 2/8] pmqtest.c: Check return values of write() and ftruncate() Date: Sat, 26 Jul 2025 17:18:31 +0800 Message-ID: <20250726091837.493915-3-yphbchou0911@gmail.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250726091837.493915-1-yphbchou0911@gmail.com> References: <20250726091837.493915-1-yphbchou0911@gmail.com> Precedence: bulk X-Mailing-List: linux-rt-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add error handling for write() to tracefs and ftruncate() on shared memory to avoid ignoring errors. Signed-off-by: Cheng-Yang Chou --- src/pmqtest/pmqtest.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/src/pmqtest/pmqtest.c b/src/pmqtest/pmqtest.c index 04e36a1..eb20baa 100644 --- a/src/pmqtest/pmqtest.c +++ b/src/pmqtest/pmqtest.c @@ -75,6 +75,7 @@ void *pmqthread(void *param) int policy = SCHED_FIFO; struct sched_param schedp; struct timespec ts; + int ret; memset(&schedp, 0, sizeof(schedp)); schedp.sched_priority = par->priority; @@ -189,7 +190,10 @@ void *pmqthread(void *param) int tracing_enabled = open(tracing_enabled_file, O_WRONLY); if (tracing_enabled >= 0) { - write(tracing_enabled, "0", 1); + ret = write(tracing_enabled, "0", 1); + if (ret < 0) + fatal("Could not write to %s: %s\n", + tracing_enabled_file, strerror(errno)); close(tracing_enabled); } else fatal("Could not access %s\n", tracing_enabled_file); -- 2.48.1