1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
//===-- runtime/file.h ------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// Raw system I/O wrappers
#ifndef FORTRAN_RUNTIME_FILE_H_
#define FORTRAN_RUNTIME_FILE_H_
#include "io-error.h"
#include "lock.h"
#include "memory.h"
#include <cinttypes>
#include <optional>
namespace Fortran::runtime::io {
class OpenFile {
public:
using FileOffset = std::int64_t;
FileOffset position() const { return position_; }
void Open(const char *path, std::size_t pathLength, const char *status,
std::size_t statusLength, const char *action, std::size_t actionLength,
IoErrorHandler &);
void Predefine(int fd);
void Close(const char *action, std::size_t actionLength, IoErrorHandler &);
int fd() const { return fd_; }
bool mayRead() const { return mayRead_; }
bool mayWrite() const { return mayWrite_; }
bool mayPosition() const { return mayPosition_; }
void set_mayRead(bool yes) { mayRead_ = yes; }
void set_mayWrite(bool yes) { mayWrite_ = yes; }
void set_mayPosition(bool yes) { mayPosition_ = yes; }
// Reads data into memory; returns amount acquired. Synchronous.
// Partial reads (less than minBytes) signify end-of-file. If the
// buffer is larger than minBytes, and extra returned data will be
// preserved for future consumption, set maxBytes larger than minBytes
// to reduce system calls This routine handles EAGAIN/EWOULDBLOCK and EINTR.
std::size_t Read(FileOffset, char *, std::size_t minBytes,
std::size_t maxBytes, IoErrorHandler &);
// Writes data. Synchronous. Partial writes indicate program-handled
// error conditions.
std::size_t Write(FileOffset, const char *, std::size_t, IoErrorHandler &);
// Truncates the file
void Truncate(FileOffset, IoErrorHandler &);
// Asynchronous transfers
int ReadAsynchronously(FileOffset, char *, std::size_t, IoErrorHandler &);
int WriteAsynchronously(
FileOffset, const char *, std::size_t, IoErrorHandler &);
void Wait(int id, IoErrorHandler &);
void WaitAll(IoErrorHandler &);
private:
struct Pending {
int id;
int ioStat{0};
OwningPtr<Pending> next;
};
// lock_ must be held for these
void CheckOpen(Terminator &);
bool Seek(FileOffset, IoErrorHandler &);
bool RawSeek(FileOffset);
int PendingResult(Terminator &, int);
Lock lock_;
int fd_{-1};
OwningPtr<char> path_;
std::size_t pathLength_;
bool mayRead_{false};
bool mayWrite_{false};
bool mayPosition_{false};
FileOffset position_{0};
std::optional<FileOffset> knownSize_;
int nextId_;
OwningPtr<Pending> pending_;
};
}
#endif // FORTRAN_RUNTIME_FILE_H_
|
