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/**
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See LICENSE in the project root for license
* information.
*/
#include <dlfcn.h>
#include <errno.h>
#include <fcntl.h>
#include <setjmp.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
// clange-format off
#include <cmocka.h>
// clange-format on
#include "capture.h"
static int stdout_fd = -1;
static int stderr_fd = -1;
static int stdout_pipe[2] = {-1, -1};
static int stderr_pipe[2] = {-1, -1};
#define BUFFER_SIZE 128 * 1024
char capture_stdout_buffer[BUFFER_SIZE];
char capture_stderr_buffer[BUFFER_SIZE];
/**
* Bypass potentially mocked close using dlsym().
*/
static int (*real_close)(int) = NULL;
static int capture_close(int fd)
{
if (!real_close)
{
real_close = (int (*)(int))dlsym(RTLD_NEXT, "close");
}
return real_close(fd);
}
/**
* Capture stdout and stderr using non-blocking pipes.
*/
void capture_setup(void **state)
{
(void)state; // Unused parameter
memset(capture_stdout_buffer, 0, BUFFER_SIZE);
memset(capture_stderr_buffer, 0, BUFFER_SIZE);
if (pipe(stdout_pipe) == -1 || pipe(stderr_pipe) == -1)
{
perror("pipe failed");
exit(EXIT_FAILURE);
}
stdout_fd = dup(STDOUT_FILENO);
stderr_fd = dup(STDERR_FILENO);
if (stdout_fd == -1 || stderr_fd == -1)
{
perror("dup failed");
exit(EXIT_FAILURE);
}
if (dup2(stdout_pipe[1], STDOUT_FILENO) == -1 || dup2(stderr_pipe[1], STDERR_FILENO) == -1)
{
perror("dup2 failed");
exit(EXIT_FAILURE);
}
capture_close(stdout_pipe[1]);
capture_close(stderr_pipe[1]);
// Set pipes to non-blocking mode
fcntl(stdout_pipe[0], F_SETFL, O_NONBLOCK);
fcntl(stderr_pipe[0], F_SETFL, O_NONBLOCK);
}
/**
* Synchronize captured stdout and return buffer.
*/
const char *capture_stdout()
{
if (stdout_pipe[0] != -1)
{
fflush(stdout);
// Read data from stdout pipe
ssize_t bytes_read;
size_t offset = strlen(capture_stdout_buffer);
while ((bytes_read = read(stdout_pipe[0], capture_stdout_buffer + offset, BUFFER_SIZE - 1 - offset)) > 0)
{
offset += bytes_read;
if (offset >= BUFFER_SIZE - 1)
{
break;
}
}
capture_stdout_buffer[offset] = '\0';
}
return capture_stdout_buffer;
}
/**
* Synchronize captured stderr and return buffer.
*/
const char *capture_stderr()
{
if (stderr_pipe[0] != -1)
{
fflush(stderr);
ssize_t bytes_read;
size_t offset = strlen(capture_stderr_buffer);
while ((bytes_read = read(stderr_pipe[0], capture_stderr_buffer + offset, BUFFER_SIZE - 1 - offset)) > 0)
{
offset += bytes_read;
if (offset >= BUFFER_SIZE - 1)
{
break;
}
}
capture_stderr_buffer[offset] = '\0';
}
return capture_stderr_buffer;
}
/**
* Restore stdout and stderr after syncing final time.
*/
void capture_teardown(void **state)
{
(void)state; // Unused parameter
if (stdout_fd != -1)
{
dup2(stdout_fd, STDOUT_FILENO);
capture_close(stdout_fd);
stdout_fd = -1;
}
if (stderr_fd != -1)
{
dup2(stderr_fd, STDERR_FILENO);
capture_close(stderr_fd);
stderr_fd = -1;
}
if (stdout_pipe[0] != -1)
{
capture_stdout();
capture_close(stdout_pipe[0]);
stdout_pipe[0] = -1;
}
if (stderr_pipe[0] != -1)
{
capture_stderr();
capture_close(stderr_pipe[0]);
stderr_pipe[0] = -1;
}
fprintf(stderr, ">> TEST STDOUT: %s\n", capture_stdout_buffer);
fprintf(stderr, ">> TEST STDERR: %s\n", capture_stderr_buffer);
}
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