GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/util/mmap_file.cc
Date: 2025-07-06 02:35:01
Exec Total Coverage
Lines: 33 49 67.3%
Branches: 13 39 33.3%
Line Branch Exec Source
1 /**
2 * This file is part of the CernVM File System.
3 *
4 * Some common functions.
5 */
6
7 #ifndef __STDC_FORMAT_MACROS
8 // NOLINTNEXTLINE
9 #define __STDC_FORMAT_MACROS
10 #endif
11
12
13 #include "mmap_file.h"
14
15 #include <cstddef>
16 #include <errno.h>
17 #include <fcntl.h>
18 #include <sys/mman.h>
19 #include <unistd.h>
20 #include <string>
21
22 #include <cassert>
23
24 #include "util/logging.h"
25 #include "util/platform.h"
26
27 using namespace std; // NOLINT
28
29 #ifdef CVMFS_NAMESPACE_GUARD
30 namespace CVMFS_NAMESPACE_GUARD {
31 #endif
32
33
34 7659 MemoryMappedFile::MemoryMappedFile(const std::string &file_path)
35 7659 : file_path_(file_path)
36 7659 , file_descriptor_(-1)
37 7659 , mapped_file_(NULL)
38 7659 , mapped_size_(0)
39 7659 , mapped_(false) { }
40
41 15316 MemoryMappedFile::~MemoryMappedFile() {
42
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 7658 if (IsMapped()) {
43 ✗ Unmap();
44 }
45 7658 }
46
47 7658 bool MemoryMappedFile::Map() {
48
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 7658 assert(!mapped_);
49
50 // open the file
51 int fd;
52
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 7658 if ((fd = open(file_path_.c_str(), O_RDONLY, 0)) == -1) {
53 ✗ LogCvmfs(kLogUtility, kLogStderr, "failed to open %s (%d)",
54 ✗ file_path_.c_str(), errno);
55 ✗ return false;
56 }
57
58 // get file size
59 platform_stat64 filesize;
60
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 7658 if (platform_fstat(fd, &filesize) != 0) {
61 ✗ LogCvmfs(kLogUtility, kLogStderr, "failed to fstat %s (%d)",
62 ✗ file_path_.c_str(), errno);
63 ✗ close(fd);
64 ✗ return false;
65 }
66
67 // check if the file is empty and 'pretend' that the file is mapped
68 // --> buffer will then look like a buffer without any size...
69 7658 void *mapping = NULL;
70
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 7658 if (filesize.st_size > 0) {
71 // map the given file into memory
72 7658 mapping = mmap(NULL, filesize.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
73
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 7658 if (mapping == MAP_FAILED) { // NOLINT(performance-no-int-to-ptr)
74 ✗ LogCvmfs(kLogUtility, kLogStderr,
75 "failed to mmap %s (file size: %ld) "
76 "(errno: %d)",
77 ✗ file_path_.c_str(), filesize.st_size, errno);
78 ✗ close(fd);
79 ✗ return false;
80 }
81 }
82
83 // save results
84 7658 mapped_file_ = static_cast<unsigned char *>(mapping);
85 7658 file_descriptor_ = fd;
86 7658 mapped_size_ = filesize.st_size;
87 7658 mapped_ = true;
88
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 7658 LogCvmfs(kLogUtility, kLogVerboseMsg, "mmap'ed %s", file_path_.c_str());
89 7658 return true;
90 }
91
92 7658 void MemoryMappedFile::Unmap() {
93
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 7658 assert(mapped_);
94
95
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 7658 if (mapped_file_ == NULL) {
96 ✗ return;
97 }
98
99 // unmap the previously mapped file
100 7658 if ((munmap(static_cast<void *>(mapped_file_), mapped_size_) != 0)
101
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 7658 || (close(file_descriptor_) != 0)) {
102 ✗ LogCvmfs(kLogUtility, kLogStderr, "failed to unmap %s", file_path_.c_str());
103 ✗ const bool munmap_failed = false;
104 ✗ assert(munmap_failed);
105 }
106
107 // reset (resettable) data
108 7658 mapped_file_ = NULL;
109 7658 file_descriptor_ = -1;
110 7658 mapped_size_ = 0;
111 7658 mapped_ = false;
112 7658 LogCvmfs(kLogUtility, kLogVerboseMsg, "munmap'ed %s", file_path_.c_str());
113 }
114
115 #ifdef CVMFS_NAMESPACE_GUARD
116 } // namespace CVMFS_NAMESPACE_GUARD
117 #endif
118