C++ (Cpp) file_testfd Exemples

Exemple #1

Fichier : sysfile.c Projet : zhaohuakai/ucore_plus

int sysfile_write(int fd, void *base, size_t len)
{
	int ret = 0;
	struct mm_struct *mm = pls_read(current)->mm;
	if (len == 0) {
		return 0;
	}
	if (!file_testfd(fd, 0, 1)) {
		return -E_INVAL;
	}
	/* for linux inode */
	if (__is_linux_devfile(fd)) {
		/* use 8byte int, in case of 64bit off_t
		 * config in linux kernel */
		size_t alen = 0;
		ret = linux_devfile_write(fd, base, len, &alen);
		if (ret)
			return ret;
		return alen;
	}
	void *buffer;
	if ((buffer = kmalloc(IOBUF_SIZE)) == NULL) {
		return -E_NO_MEM;
	}

	size_t copied = 0, alen;
	while (len != 0) {
		if ((alen = IOBUF_SIZE) > len) {
			alen = len;
		}
		lock_mm(mm);
		{
			if (!copy_from_user(mm, buffer, base, alen, 0)) {
				ret = -E_INVAL;
			}
		}
		unlock_mm(mm);
		if (ret == 0) {
			ret = file_write(fd, buffer, alen, &alen);
			if (alen != 0) {
				assert(len >= alen);
				base += alen, len -= alen, copied += alen;
			}
		}
		if (ret != 0 || alen == 0) {
			goto out;
		}
	}

out:
	kfree(buffer);
	if (copied != 0) {
		return copied;
	}
	return ret;
}

Exemple #2

Fichier : sysfile.c Projet : zhaohuakai/ucore_plus

int sysfile_read(int fd, void *base, size_t len)
{
	int ret = 0;
	struct mm_struct *mm = pls_read(current)->mm;
	if (len == 0) {
		return 0;
	}
	if (!file_testfd(fd, 1, 0)) {
		return -E_INVAL;
	}
	/* for linux inode */
	if (__is_linux_devfile(fd)) {
		size_t alen = 0;
		ret = linux_devfile_read(fd, base, len, &alen);
		if (ret)
			return ret;
		return alen;
	}
	void *buffer;
	if ((buffer = kmalloc(IOBUF_SIZE)) == NULL) {
		return -E_NO_MEM;
	}

	size_t copied = 0, alen;
	while (len != 0) {
		if ((alen = IOBUF_SIZE) > len) {
			alen = len;
		}
		ret = file_read(fd, buffer, alen, &alen);
		if (alen != 0) {
			lock_mm(mm);
			{
				if (copy_to_user(mm, base, buffer, alen)) {
					assert(len >= alen);
					base += alen, len -= alen, copied +=
					    alen;
				} else if (ret == 0) {
					ret = -E_INVAL;
				}
			}
			unlock_mm(mm);
		}
		if (ret != 0 || alen == 0) {
			goto out;
		}
	}

out:
	kfree(buffer);
	if (copied != 0) {
		return copied;
	}
	return ret;
}

Exemple #3

Fichier : sysfile.c Projet : wwffcc/spoc_discussions

/* sysfile_read - read file */
int
sysfile_read(int fd, void *base, size_t len) {
    cprintf("sysfile_read fd = %d\n",fd);

    struct mm_struct *mm = current->mm;
    if (len == 0) {
        return 0;
    }
    if (!file_testfd(fd, 1, 0)) {
        return -E_INVAL;
    }
    void *buffer;
    if ((buffer = kmalloc(IOBUF_SIZE)) == NULL) {
        return -E_NO_MEM;
    }

    int ret = 0;
    size_t copied = 0, alen;
    while (len != 0) {
        if ((alen = IOBUF_SIZE) > len) {
            alen = len;
        }
        ret = file_read(fd, buffer, alen, &alen);
        if (alen != 0) {
            lock_mm(mm);
            {
                if (copy_to_user(mm, base, buffer, alen)) {
                    assert(len >= alen);
                    base += alen, len -= alen, copied += alen;
                }
                else if (ret == 0) {
                    ret = -E_INVAL;
                }
            }
            unlock_mm(mm);
        }
        if (ret != 0 || alen == 0) {
            goto out;
        }
    }

out:
    kfree(buffer);
    if (copied != 0) {
        return copied;
    }
    return ret;
}

Exemple #4

Fichier : sysfile.c Projet : spinlock/ucore

int
sysfile_write(int fd, void *base, size_t len) {
    struct mm_struct *mm = current->mm;
    if (len == 0) {
        return 0;
    }
    if (!file_testfd(fd, 0, 1)) {
        return -E_INVAL;
    }
    void *buffer;
    if ((buffer = kmalloc(IOBUF_SIZE)) == NULL) {
        return -E_NO_MEM;
    }

    int ret = 0;
    size_t copied = 0, alen;
    while (len != 0) {
        if ((alen = IOBUF_SIZE) > len) {
            alen = len;
        }
        lock_mm(mm);
        {
            if (!copy_from_user(mm, buffer, base, alen, 0)) {
                ret = -E_INVAL;
            }
        }
        unlock_mm(mm);
        if (ret == 0) {
            ret = file_write(fd, buffer, alen, &alen);
            if (alen != 0) {
                assert(len >= alen);
                base += alen, len -= alen, copied += alen;
            }
        }
        if (ret != 0 || alen == 0) {
            goto out;
        }
    }

out:
    kfree(buffer);
    if (copied != 0) {
        return copied;
    }
    return ret;
}