[alsa-utils][PATCH 10/14] axfer: test: minor code arrangement to use the same file descriptor for mappter-test

[Takashi Sakamoto]

In mapper test program, two set of file descriptors open to the same files
for container builder and parser contexts, however the same file descriptor
is available for the case.

This commit arranges to use the same file descriptor for the contexts.

Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>
---
 axfer/test/mapper-test.c | 73 +++++++++++++++++++---------------------
 1 file changed, 34 insertions(+), 39 deletions(-)

diff --git a/axfer/test/mapper-test.c b/axfer/test/mapper-test.c
index 78a063a..0bed4bb 100644
--- a/axfer/test/mapper-test.c
+++ b/axfer/test/mapper-test.c
@@ -63,32 +63,20 @@ static int test_demux(struct mapper_trial *trial, snd_pcm_access_t access,
 		      unsigned int frames_per_second,
 		      unsigned int frames_per_buffer,
 		      void *frame_buffer, unsigned int frame_count,
-		      unsigned int cntr_count)
+		      int *cntr_fds, unsigned int cntr_count)
 {
 	struct container_context *cntrs = trial->cntrs;
 	enum container_format cntr_format = trial->cntr_format;
-	int *cntr_fds;
 	unsigned int bytes_per_sample;
 	uint64_t total_frame_count;
 	int i;
 	int err = 0;
 
-	cntr_fds = calloc(cntr_count, sizeof(*cntr_fds));
-	if (cntr_fds == NULL)
-		return -ENOMEM;
-
 	for (i = 0; i < cntr_count; ++i) {
-		const char *path = trial->paths[i];
 		snd_pcm_format_t format;
 		unsigned int channels;
 		unsigned int rate;
 
-		cntr_fds[i] = open(path, O_RDWR | O_CREAT | O_TRUNC, 0644);
-		if (cntr_fds[i] < 0) {
-			err = -errno;
-			goto end;
-		}
-
 		err = container_builder_init(cntrs + i, cntr_fds[i], cntr_format, 0);
 		if (err < 0)
 			goto end;
@@ -124,12 +112,8 @@ static int test_demux(struct mapper_trial *trial, snd_pcm_access_t access,
 		assert(total_frame_count == frame_count);
 	}
 end:
-	for (i = 0; i < cntr_count; ++i) {
+	for (i = 0; i < cntr_count; ++i)
 		container_context_destroy(cntrs + i);
-		close(cntr_fds[i]);
-	}
-
-	free(cntr_fds);
 
 	return err;
 }
@@ -170,31 +154,19 @@ static int test_mux(struct mapper_trial *trial, snd_pcm_access_t access,
 		    unsigned int frames_per_second,
 		    unsigned int frames_per_buffer,
 		    void *frame_buffer, unsigned int frame_count,
-		    unsigned int cntr_count)
+		    int *cntr_fds, unsigned int cntr_count)
 {
 	struct container_context *cntrs = trial->cntrs;
-	int *cntr_fds;
 	unsigned int bytes_per_sample;
 	uint64_t total_frame_count;
 	int i;
 	int err = 0;
 
-	cntr_fds = calloc(cntr_count, sizeof(*cntr_fds));
-	if (cntr_fds == NULL)
-		return -ENOMEM;
-
 	for (i = 0; i < cntr_count; ++i) {
-		const char *path = trial->paths[i];
 		snd_pcm_format_t format;
 		unsigned int channels;
 		unsigned int rate;
 
-		cntr_fds[i] = open(path, O_RDONLY);
-		if (cntr_fds[i] < 0) {
-			err = -errno;
-			goto end;
-		}
-
 		err = container_parser_init(cntrs + i, cntr_fds[i], 0);
 		if (err < 0)
 			goto end;
@@ -230,12 +202,8 @@ static int test_mux(struct mapper_trial *trial, snd_pcm_access_t access,
 		assert(total_frame_count == frame_count);
 	}
 end:
-	for (i = 0; i < cntr_count; ++i) {
+	for (i = 0; i < cntr_count; ++i)
 		container_context_destroy(cntrs + i);
-		close(cntr_fds[i]);
-	}
-
-	free(cntr_fds);
 
 	return err;
 }
@@ -247,6 +215,7 @@ static int test_mapper(struct mapper_trial *trial, snd_pcm_access_t access,
 		    void *check_buffer, unsigned int frame_count,
 		    unsigned int cntr_count)
 {
+	int *cntr_fds;
 	unsigned int frames_per_buffer;
 	int i;
 	int err;
@@ -254,18 +223,44 @@ static int test_mapper(struct mapper_trial *trial, snd_pcm_access_t access,
 	// Use a buffer aligned by typical size of page frame.
 	frames_per_buffer = ((frame_count + 4096) / 4096) * 4096;
 
+	cntr_fds = calloc(cntr_count, sizeof(*cntr_fds));
+	if (cntr_fds == NULL)
+		return -ENOMEM;
+
+	for (i = 0; i < cntr_count; ++i) {
+		const char *path = trial->paths[i];
+
+		cntr_fds[i] = open(path, O_RDWR | O_CREAT | O_TRUNC, 0644);
+		if (cntr_fds[i] < 0) {
+			err = -errno;
+			goto end;
+		}
+	}
+
 	err = test_demux(trial, access, sample_format, samples_per_frame,
 			 frames_per_second, frames_per_buffer, frame_buffer,
-			 frame_count, cntr_count);
+			 frame_count, cntr_fds, cntr_count);
 	if (err < 0)
 		goto end;
 
+	for (i = 0; i < cntr_count; ++i) {
+		off64_t pos = lseek64(cntr_fds[i], 0, SEEK_SET);
+		if (pos != 0) {
+			err = -EIO;
+			goto end;
+		}
+	}
+
 	err = test_mux(trial, access, sample_format, samples_per_frame,
 		       frames_per_second, frames_per_buffer, check_buffer,
-		       frame_count, cntr_count);
+		       frame_count, cntr_fds, cntr_count);
 end:
-	for (i = 0; i < cntr_count; ++i)
+	for (i = 0; i < cntr_count; ++i) {
 		unlink(trial->paths[i]);
+		close(cntr_fds[i]);
+	}
+
+	free(cntr_fds);
 
 	return err;
 }
-- 
2.27.0