SReadWriteChannel CHANNEL_PUBLIC create_duplex_named_pipe(const char* name,std::size_t bufferSize, uint8_t maxInstances)
{
return SReadWriteChannel(create_named_pipe(name, PIPE_ACCESS_DUPLEX, bufferSize, maxInstances));
}
int start()
{
/* This is the "starter process" for statistical profiling.
*
* Create output file for profiling data. Create named pipe to
* synchronize with stopper process. Fork so the parent can exit.
* Allocate memory for profiling data. Start profiling in kernel.
* Complete detachment from terminal. Write known string to named
* pipe, which blocks until read by stopper process. Redirect
* stdout/stderr to the named pipe. Write profiling data to file.
* Clean up.
*/
int log_fd;
if (init_outfile() || create_named_pipe()) return 1;
printf("Starting statistical profiling.\n");
if (fork() != 0) exit(0);
if (alloc_mem()) return 1;
if (sprofile(PROF_START, mem_size, freq, intr_type, &sprof_info, mem_ptr)) {
perror("sprofile");
fprintf(stderr, "Error starting profiling.\n");
return 1;
}
detach();
/* Temporarily redirect to system log to catch errors. */
log_fd = open(DEV_LOG, O_WRONLY);
dup2(log_fd, 1);
dup2(log_fd, 2);
if ((npipe_fd = open(NPIPE, O_WRONLY)) < 0) {
fprintf(stderr, "Unable to open named pipe %s.\n", NPIPE);
return 1;
} else
/* Synchronize with stopper process. */
write(npipe_fd, SYNCING, strlen(SYNCING));
/* Now redirect to named pipe. */
dup2(npipe_fd, 1);
dup2(npipe_fd, 2);
mem_used = sprof_info.mem_used;
if (mem_used == -1) {
fprintf(stderr, "WARNING: Profiling was stopped prematurely due to ");
fprintf(stderr, "insufficient memory.\n");
fprintf(stderr, "Try increasing available memory using the -m switch.\n");
}
if (write_outfile()) return 1;
close(log_fd);
close(npipe_fd);
unlink(NPIPE);
close(outfile_fd);
free(mem_ptr);
return 0;
}
