/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to

 * deal in the Software without restriction, including without limitation the

 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or

 * sell copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS

 * IN THE SOFTWARE.

 */

#include "runner-unix.h"

#include "runner.h"

#include <limits.h>

#include <stdint.h> /* uintptr_t */

#include <errno.h>

#include <unistd.h> /* readlink, usleep */

#include <string.h> /* strdup */

#include <stdio.h>

#include <stdlib.h>

#include <sys/types.h>

#include <signal.h>

#include <sys/wait.h>

#include <sys/stat.h>

#include <assert.h>

#include <sys/select.h>

#include <sys/time.h>

#include <pthread.h>

/* Do platform-specific initialization. */

int platform_init(int argc, char **argv) {

  /* Disable stdio output buffering. */

  setvbuf(stdout, NULL, _IONBF, 0);

  setvbuf(stderr, NULL, _IONBF, 0);

  signal(SIGPIPE, SIG_IGN);

  if (realpath(argv[0], executable_path) == NULL) {

    perror("realpath");

    return -1;

  }

  return 0;

}

/* Invoke "argv[0] test-name [test-part]". Store process info in *p. Make sure

 * that all stdio output of the processes is buffered up. */

int process_start(char* name, char* part, process_info_t* p, int is_helper) {

  FILE* stdout_file;

  int stdout_fd;

  const char* arg;

  char* args[16];

  int n;

  pid_t pid;

  stdout_file = tmpfile();

  stdout_fd = fileno(stdout_file);

  if (!stdout_file) {

    perror("tmpfile");

    return -1;

  }

  p->terminated = 0;

  p->status = 0;

  pid = fork();

  if (pid < 0) {

    perror("fork");

    return -1;

  }

  if (pid == 0) {

    /* child */

    arg = getenv("UV_USE_VALGRIND");

    n = 0;

    /* Disable valgrind for helpers, it complains about helpers leaking memory.

     * They're killed after the test and as such never get a chance to clean up.

     */

    if (is_helper == 0 && arg != NULL && atoi(arg) != 0) {

      args[n++] = "valgrind";

      args[n++] = "--quiet";

      args[n++] = "--leak-check=full";

      args[n++] = "--show-reachable=yes";

      args[n++] = "--error-exitcode=125";

    }

    args[n++] = executable_path;

    args[n++] = name;

    args[n++] = part;

    args[n++] = NULL;

    dup2(stdout_fd, STDOUT_FILENO);

    dup2(stdout_fd, STDERR_FILENO);

    execvp(args[0], args);

    perror("execvp()");

    _exit(127);

  }

  /* parent */

  p->pid = pid;

  p->name = strdup(name);

  p->stdout_file = stdout_file;

  return 0;

}

typedef struct {

  int pipe[2];

  process_info_t* vec;

  int n;

} dowait_args;

/* This function is run inside a pthread. We do this so that we can possibly

 * timeout.

 */

static void* dowait(void* data) {

  dowait_args* args = data;

  int i, r;

  process_info_t* p;

  for (i = 0; i < args->n; i++) {

    p = (process_info_t*)(args->vec + i * sizeof(process_info_t));

    if (p->terminated) continue;

    r = waitpid(p->pid, &p->status, 0);

    if (r < 0) {

      perror("waitpid");

      return NULL;

    }

    p->terminated = 1;

  }

  if (args->pipe[1] >= 0) {

    /* Write a character to the main thread to notify it about this. */

    ssize_t r;

    do

      r = write(args->pipe[1], "", 1);

    while (r == -1 && errno == EINTR);

  }

  return NULL;

}

/* Wait for all `n` processes in `vec` to terminate. Time out after `timeout`

 * msec, or never if timeout == -1. Return 0 if all processes are terminated,

 * -1 on error, -2 on timeout. */

int process_wait(process_info_t* vec, int n, int timeout) {

  int i;

  int r;

  int retval;

  process_info_t* p;

  dowait_args args;

  pthread_t tid;

  pthread_attr_t attr;

  unsigned int elapsed_ms;

  struct timeval timebase;

  struct timeval tv;

  fd_set fds;

  args.vec = vec;

  args.n = n;

  args.pipe[0] = -1;

  args.pipe[1] = -1;

  /* The simple case is where there is no timeout */

  if (timeout == -1) {

    dowait(&args);

    return 0;

  }

  /* Hard case. Do the wait with a timeout.

   *

   * Assumption: we are the only ones making this call right now. Otherwise

   * we'd need to lock vec.

   */

  r = pipe((int*)&(args.pipe));

  if (r) {

    perror("pipe()");

    return -1;

  }

  if (pthread_attr_init(&attr))

    abort();

#if defined(__MVS__)

  if (pthread_attr_setstacksize(&attr, 1024 * 1024))

#else

  if (pthread_attr_setstacksize(&attr, 256 * 1024))

#endif

    abort();

  r = pthread_create(&tid, &attr, dowait, &args);

  if (pthread_attr_destroy(&attr))

    abort();

  if (r) {

    perror("pthread_create()");

    retval = -1;

    goto terminate;

  }

  if (gettimeofday(&timebase, NULL))

    abort();

  tv = timebase;

  for (;;) {

    /* Check that gettimeofday() doesn't jump back in time. */

    assert(tv.tv_sec > timebase.tv_sec ||

           (tv.tv_sec == timebase.tv_sec && tv.tv_usec >= timebase.tv_usec));

    elapsed_ms =

        (tv.tv_sec - timebase.tv_sec) * 1000 +

        (tv.tv_usec / 1000) -

        (timebase.tv_usec / 1000);

    r = 0;  /* Timeout. */

    if (elapsed_ms >= (unsigned) timeout)

      break;

    tv.tv_sec = (timeout - elapsed_ms) / 1000;

    tv.tv_usec = (timeout - elapsed_ms) % 1000 * 1000;

    FD_ZERO(&fds);

    FD_SET(args.pipe[0], &fds);

    r = select(args.pipe[0] + 1, &fds, NULL, NULL, &tv;;

    if (!(r == -1 && errno == EINTR))

      break;

    if (gettimeofday(&tv, NULL))

      abort();

  }

  if (r == -1) {

    perror("select()");

    retval = -1;

  } else if (r) {

    /* The thread completed successfully. */

    retval = 0;

  } else {

    /* Timeout. Kill all the children. */

    for (i = 0; i < n; i++) {

      p = (process_info_t*)(vec + i * sizeof(process_info_t));

      kill(p->pid, SIGTERM);

    }

    retval = -2;

  }

  if (pthread_join(tid, NULL))

    abort();

terminate:

  close(args.pipe[0]);

  close(args.pipe[1]);

  return retval;

}

/* Returns the number of bytes in the stdio output buffer for process `p`. */

long int process_output_size(process_info_t *p) {

  /* Size of the p->stdout_file */

  struct stat buf;

  int r = fstat(fileno(p->stdout_file), &buf;;

  if (r < 0) {

    return -1;

  }

  return (long)buf.st_size;

}

/* Copy the contents of the stdio output buffer to `fd`. */

int process_copy_output(process_info_t* p, FILE* stream) {

  char buf[1024];

  int r;

  r = fseek(p->stdout_file, 0, SEEK_SET);

  if (r < 0) {

    perror("fseek");

    return -1;

  }

  /* TODO: what if the line is longer than buf */

  while (fgets(buf, sizeof(buf), p->stdout_file) != NULL)

    print_lines(buf, strlen(buf), stream);

  if (ferror(p->stdout_file)) {

    perror("read");

    return -1;

  }

  return 0;

}

/* Copy the last line of the stdio output buffer to `buffer` */

int process_read_last_line(process_info_t *p,

                           char* buffer,

                           size_t buffer_len) {

  char* ptr;

  int r = fseek(p->stdout_file, 0, SEEK_SET);

  if (r < 0) {

    perror("fseek");

    return -1;

  }

  buffer[0] = '\0';

  while (fgets(buffer, buffer_len, p->stdout_file) != NULL) {

    for (ptr = buffer; *ptr && *ptr != '\r' && *ptr != '\n'; ptr++);

    *ptr = '\0';

  }

  if (ferror(p->stdout_file)) {

    perror("read");

    buffer[0] = '\0';

    return -1;

  }

  return 0;

}

/* Return the name that was specified when `p` was started by process_start */

char* process_get_name(process_info_t *p) {

  return p->name;

}

/* Terminate process `p`. */

int process_terminate(process_info_t *p) {

  return kill(p->pid, SIGTERM);

}

/* Return the exit code of process p. On error, return -1. */

int process_reap(process_info_t *p) {

  if (WIFEXITED(p->status)) {

    return WEXITSTATUS(p->status);

  } else  {

    return p->status; /* ? */

  }

}

/* Clean up after terminating process `p` (e.g. free the output buffer etc.). */

void process_cleanup(process_info_t *p) {

  fclose(p->stdout_file);

  free(p->name);

}

/* Move the console cursor one line up and back to the first column. */

void rewind_cursor(void) {

#if defined(__MVS__)

  fprintf(stderr, "\047[2K\r");

#else

  fprintf(stderr, "\033[2K\r");

#endif

}

/* Pause the calling thread for a number of milliseconds. */

void uv_sleep(int msec) {

  int sec;

  int usec;

  sec = msec / 1000;

  usec = (msec % 1000) * 1000;

  if (sec > 0)

    sleep(sec);

  if (usec > 0)

    usleep(usec);

}