Created
October 15, 2012 08:42
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Redirect stderr into a pipe, filter and then write to stdout (for NSLog filtering)
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int main(int argc, char *argv[]) | |
{ | |
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0), ^(void) { | |
size_t const BUFFER_SIZE = 2048; | |
// Create a pipe | |
int pipe_in_out[2]; | |
if (pipe(pipe_in_out) == -1) | |
return; | |
// Connect the 'in' end of the pipe to the stderr | |
if (dup2(pipe_in_out[1], STDERR_FILENO) == -1) | |
return; | |
char *buffer = malloc(BUFFER_SIZE); | |
if (buffer == 0) | |
return; | |
for (;;) | |
{ | |
// Read from the 'out' end of the pipe | |
ssize_t bytes_read = read(pipe_in_out[0], buffer, BUFFER_SIZE); | |
if (bytes_read <= 0) | |
break; | |
// Filter and print to stdout | |
if (should_show(buffer)) // TODO: Apply filters here | |
fwrite(buffer, 1, bytes_read, stdout); | |
} | |
free(buffer); | |
close(pipe_in_out[1]); | |
}); | |
// Rest of main | |
} |
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