afh_recv: Improve error diagnostics.

There are many reasons for afh_recv_open() to fail. For example, the
afh receiver could be unable to open its input file, or the given
begin chunk was larger than the end chunk. At the moment the error
reporting is a bit scarce since only the string of the error code is
printed. This commit makes afh_recv_open() print also the reason for
the error and the name of the file that caused the error.

diff --git a/afh_recv.c b/afh_recv.c
index c3e6ddbd0ecf85e320484c0e1ca4298f5c480d9a..6525209bff4119a177eb443f154b4f1f5224845b 100644 (file)
--- a/afh_recv.c
+++ b/afh_recv.c
@@ -68,7 +68,7 @@ static int afh_recv_open(struct receiver_node *rn)
        struct lls_parse_result *lpr = rn->lpr;
        struct private_afh_recv_data *pard;
        struct afh_info *afhi;
-       const char *fn = RECV_CMD_OPT_STRING_VAL(AFH, FILENAME, lpr);
+       const char *fn = RECV_CMD_OPT_STRING_VAL(AFH, FILENAME, lpr), *msg;
        int32_t bc = RECV_CMD_OPT_INT32_VAL(AFH, BEGIN_CHUNK, lpr);
        const struct lls_opt_result *r_e = RECV_CMD_OPT_RESULT(AFH, END_CHUNK, lpr);
        int ret;
@@ -87,8 +87,10 @@ static int afh_recv_open(struct receiver_node *rn)
                goto out_unmap;
        pard->audio_format_num = ret;
        ret = -ERRNO_TO_PARA_ERROR(EINVAL);
+       msg = "no data chunks";
        if (afhi->chunks_total == 0)
                goto out_clear_afhi;
+       msg = "invalid begin chunk";
        if (PARA_ABS(bc) >= afhi->chunks_total)
                goto out_clear_afhi;
        if (bc >= 0)
@@ -100,6 +102,7 @@ static int afh_recv_open(struct receiver_node *rn)
        if (lls_opt_given(r_e)) {
                int32_t ec = lls_int32_val(0, r_e);
                ret = -ERRNO_TO_PARA_ERROR(EINVAL);
+               msg = "invalid end chunk";
                if (PARA_ABS(ec) > afhi->chunks_total)
                        goto out_clear_afhi;
                if (ec >= 0)
@@ -109,12 +112,14 @@ static int afh_recv_open(struct receiver_node *rn)
        } else
                pard->last_chunk = afhi->chunks_total - 1;
        ret = -ERRNO_TO_PARA_ERROR(EINVAL);
+       msg = "begin chunk >= end chunk!?";
        if (pard->first_chunk >= pard->last_chunk)
                goto out_clear_afhi;
        pard->current_chunk = pard->first_chunk;
        return pard->audio_format_num;
 out_clear_afhi:
        clear_afhi(afhi);
+       PARA_ERROR_LOG("%s: %s\n", fn, msg);
 out_unmap:
        para_munmap(pard->map, pard->map_size);
        close(pard->fd);