GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/util/mmap_file.cc
Date: 2025-02-09 02:34:19
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 <errno.h>
16 #include <fcntl.h>
17 #include <sys/mman.h>
18 #include <unistd.h>
19
20 #include <cassert>
21
22 #include "util/logging.h"
23 #include "util/platform.h"
24
25 using namespace std; // NOLINT
26
27 #ifdef CVMFS_NAMESPACE_GUARD
28 namespace CVMFS_NAMESPACE_GUARD {
29 #endif
30
31
32 256 MemoryMappedFile::MemoryMappedFile(const std::string &file_path) :
33 256 file_path_(file_path),
34 256 file_descriptor_(-1),
35 256 mapped_file_(NULL),
36 256 mapped_size_(0),
37 256 mapped_(false) {}
38
39 512 MemoryMappedFile::~MemoryMappedFile() {
40
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 256 if (IsMapped()) {
41 ✗ Unmap();
42 }
43 256 }
44
45 256 bool MemoryMappedFile::Map() {
46
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 256 assert(!mapped_);
47
48 // open the file
49 int fd;
50
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 256 if ((fd = open(file_path_.c_str(), O_RDONLY, 0)) == -1) {
51 ✗ LogCvmfs(kLogUtility, kLogStderr, "failed to open %s (%d)",
52 ✗ file_path_.c_str(), errno);
53 ✗ return false;
54 }
55
56 // get file size
57 platform_stat64 filesize;
58
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 256 if (platform_fstat(fd, &filesize) != 0) {
59 ✗ LogCvmfs(kLogUtility, kLogStderr, "failed to fstat %s (%d)",
60 ✗ file_path_.c_str(), errno);
61 ✗ close(fd);
62 ✗ return false;
63 }
64
65 // check if the file is empty and 'pretend' that the file is mapped
66 // --> buffer will then look like a buffer without any size...
67 256 void *mapping = NULL;
68
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 256 if (filesize.st_size > 0) {
69 // map the given file into memory
70 256 mapping = mmap(NULL, filesize.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
71
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 256 if (mapping == MAP_FAILED) { // NOLINT(performance-no-int-to-ptr)
72 ✗ LogCvmfs(kLogUtility, kLogStderr, "failed to mmap %s (file size: %ld) "
73 "(errno: %d)",
74 file_path_.c_str(),
75 filesize.st_size,
76 ✗ errno);
77 ✗ close(fd);
78 ✗ return false;
79 }
80 }
81
82 // save results
83 256 mapped_file_ = static_cast<unsigned char*>(mapping);
84 256 file_descriptor_ = fd;
85 256 mapped_size_ = filesize.st_size;
86 256 mapped_ = true;
87
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 256 LogCvmfs(kLogUtility, kLogVerboseMsg, "mmap'ed %s", file_path_.c_str());
88 256 return true;
89 }
90
91 256 void MemoryMappedFile::Unmap() {
92
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 256 assert(mapped_);
93
94
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 256 if (mapped_file_ == NULL) {
95 ✗ return;
96 }
97
98 // unmap the previously mapped file
99
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 512 if ((munmap(static_cast<void*>(mapped_file_), mapped_size_) != 0) ||
100
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 256 (close(file_descriptor_) != 0))
101 {
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
108 256 mapped_file_ = NULL;
109 256 file_descriptor_ = -1;
110 256 mapped_size_ = 0;
111 256 mapped_ = false;
112 256 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