[PATCH v2] tools/9pfsd: Fix build error caused by strerror_r()

[Henry Wang <xin.wang2@xxxxxxx>]

Below error can be seen when doing Yocto build of the toolstack:

| io.c: In function 'p9_error':
| io.c:684:5: error: ignoring return value of 'strerror_r' declared
  with attribute 'warn_unused_result' [-Werror=unused-result]
|   684 |     strerror_r(err, ring->buffer, ring->ring_size);
|       |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| cc1: all warnings being treated as errors

Fix the build by using strerror() to replace strerror_r(). Since
strerror() is thread-unsafe, use a separate local mutex to protect
the action. The steps would then become: Acquire the mutex first,
invoke strerror(), copy the string from strerror() to the designated
buffer and then drop the mutex.

Signed-off-by: Henry Wang <xin.wang2@xxxxxxx>
---
 tools/9pfsd/io.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/tools/9pfsd/io.c b/tools/9pfsd/io.c
index adb887c7d9..2b80c9528d 100644
--- a/tools/9pfsd/io.c
+++ b/tools/9pfsd/io.c
@@ -680,8 +680,18 @@ static bool name_ok(const char *str)
 static void p9_error(struct ring *ring, uint16_t tag, uint32_t err)
 {
     unsigned int erroff;
+    static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+    char *strerror_str;
+    RING_IDX strerror_len = 0, copy_len = 0;
+
+    pthread_mutex_lock(&mutex);
+    strerror_str = strerror(err);
+    strerror_len = strlen(strerror_str) + 1;
+    copy_len = min(strerror_len, ring->ring_size);
+    memcpy(ring->buffer, strerror_str, copy_len);
+    ((char *)(ring->buffer))[copy_len - 1] = '\0';
+    pthread_mutex_unlock(&mutex);
 
-    strerror_r(err, ring->buffer, ring->ring_size);
     erroff = add_string(ring, ring->buffer, strlen(ring->buffer));
     fill_buffer(ring, P9_CMD_ERROR, tag, "SU",
                 erroff != ~0 ? ring->str + erroff : "cannot allocate memory",
-- 
2.34.1