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Add pipe()

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@779 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
2008-07-26 13:12:11 +00:00
parent 048d0bd45e
commit b918dac0c3
10 changed files with 898 additions and 411 deletions
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examples/pipe/pipe_main.c
+51 -19
View File
@@ -102,9 +102,12 @@ static void *reader(pthread_addr_t pvarg)
}
else if (ret == 0)
{
#warning BUG: pipe should return zero when writer closes
fprintf(stderr, "reader: Received zero bytes\n");
return (void*)2;
if (nbytes < NREAD_BYTES)
{
fprintf(stderr, "reader: Too few bytes read -- aborting: %d\n", nbytes);
return (void*)2;
}
break;
}
for (ndx = 0; ndx < ret; ndx++)
{
@@ -121,6 +124,11 @@ static void *reader(pthread_addr_t pvarg)
value++;
}
nbytes += ret;
if (nbytes > NREAD_BYTES)
{
fprintf(stderr, "reader: Too many bytes read -- aborting: %d\n", nbytes);
return (void*)3;
}
}
printf("reader: %d bytes read\n", nbytes);
return (void*)0;
@@ -252,8 +260,7 @@ void user_initialize(void)
int user_start(int argc, char *argv[])
{
int fdin;
int fdout;
int filedes[2];
int ret;
/* Test FIFO logic */
@@ -266,26 +273,33 @@ int user_start(int argc, char *argv[])
return 1;
}
fdin = open(CONFIG_EXAMPLES_FIFO_PATH, O_RDONLY);
if (fdin < 0)
/* Open open end of the FIFO for reading and the other end for writing. NOTE:
* the following would not work on most FIFO implementations because the attempt
* to open just one end of the FIFO would block. The NuttX FIFOs do not block.
*/
filedes[1] = open(CONFIG_EXAMPLES_FIFO_PATH, O_WRONLY);
if (filedes[1] < 0)
{
fprintf(stderr, "user_start: Failed to open FIFO %s for writing, errno=%d\n",
CONFIG_EXAMPLES_FIFO_PATH, errno);
close(filedes[0]);
return 3;
}
filedes[0] = open(CONFIG_EXAMPLES_FIFO_PATH, O_RDONLY);
if (filedes[0] < 0)
{
fprintf(stderr, "user_start: Failed to open FIFO %s for reading, errno=%d\n",
CONFIG_EXAMPLES_FIFO_PATH, errno);
return 2;
}
fdout = open(CONFIG_EXAMPLES_FIFO_PATH, O_WRONLY);
if (fdout < 0)
{
fprintf(stderr, "user_start: Failed to open FIFO %s for writing, errno=%d\n",
CONFIG_EXAMPLES_FIFO_PATH, errno);
close(fdin);
return 3;
}
/* Then perform the test using those file descriptors */
ret = perform_test(fdin, fdout);
close(fdin);
close(fdout);
ret = perform_test(filedes[0], filedes[1]);
close(filedes[0]);
close(filedes[1]);
unlink(CONFIG_EXAMPLES_FIFO_PATH);
if (ret != 0)
{
@@ -297,7 +311,25 @@ int user_start(int argc, char *argv[])
/* Test PIPE logic */
printf("user_start: Performing pipe test\n");
/* Not yet implemented */
ret = pipe(filedes);
if (ret < 0)
{
fprintf(stderr, "user_start: pipe failed with errno=%d\n", errno);
return 1;
}
/* Then perform the test using those file descriptors */
ret = perform_test(filedes[0], filedes[1]);
close(filedes[0]);
close(filedes[1]);
unlink(CONFIG_EXAMPLES_FIFO_PATH);
if (ret != 0)
{
fprintf(stderr, "user_start: PIPE test FAILED\n");
return 4;
}
printf("user_start: PIPE test PASSED\n");
fflush(stdout);
return 0;