pintos-doxygen/html/multi-child-fd_8c_source.html

/** Opens a file and then runs a subprocess that tries to close

   the file.  (Pintos does not have inheritance of file handles,

   so this must fail.)  The parent process then attempts to use

   the file handle, which must succeed. */


#include <stdio.h>

#include <syscall.h>

#include "tests/userprog/sample.inc"

#include "tests/lib.h"

#include "tests/main.h"


void

test_main (void)

{

  char child_cmd[128];

  int handle;


  CHECK ((handle = open ("sample.txt")) > 1, "open \"sample.txt\"");


  snprintf (child_cmd, sizeof child_cmd, "child-close %d", handle);


  msg ("wait(exec()) = %d", wait (exec (child_cmd)));


  check_file_handle (handle, "sample.txt", sample, sizeof sample - 1);

}

wait
static void wait(struct intq *q, struct thread **waiter)

snprintf
int snprintf(char *buffer, size_t buf_size, const char *format,...)
Like printf(), except that output is stored into BUFFER, which must have space for BUF_SIZE character...
Definition: stdio.c:62

open
int open(const char *file)
Definition: syscall.c:103

exec
pid_t exec(const char *file)
Definition: syscall.c:79

msg
void msg(const char *format,...)
Definition: lib.c:28

check_file_handle
void check_file_handle(int fd, const char *file_name, const void *buf_, size_t size)
Definition: lib.c:108

lib.h

CHECK
#define CHECK(SUCCESS,...)
Takes an expression to test for SUCCESS and a message, which may include printf-style arguments.
Definition: lib.h:29

main.h

test_main
void test_main(void)
Opens a file and then runs a subprocess that tries to close the file.
Definition: multi-child-fd.c:13