1 #include "temporary_file.hpp" 2 3 #include <errno.h> 4 #include <fcntl.h> 5 #include <stdlib.h> 6 #include <string.h> 7 #include <unistd.h> 8 9 #include <stdexcept> 10 11 namespace openpower 12 { 13 namespace pels 14 { 15 namespace util 16 { 17 TemporaryFile(const char * data,const uint32_t len)18TemporaryFile::TemporaryFile(const char* data, const uint32_t len) 19 { 20 // Build template path required by mkstemp() 21 std::string templatePath = fs::temp_directory_path() / 22 "phosphor-logging-XXXXXX"; 23 24 // Generate unique file name, create file, and open it. The XXXXXX 25 // characters are replaced by mkstemp() to make the file name unique. 26 fd = mkostemp(templatePath.data(), O_RDWR); 27 if (fd == -1) 28 { 29 throw std::runtime_error{ 30 std::string{"Unable to create temporary file: "} + strerror(errno)}; 31 } 32 33 // Update file with input Buffer data 34 auto rc = write(fd, data, len); 35 if (rc == -1) 36 { 37 // Delete temporary file. The destructor won't be called because the 38 // exception below causes this constructor to exit without completing. 39 remove(); 40 throw std::runtime_error{std::string{"Unable to update file: "} + 41 strerror(errno)}; 42 } 43 44 // Store path to temporary file 45 path = templatePath; 46 } 47 operator =(TemporaryFile && file)48TemporaryFile& TemporaryFile::operator=(TemporaryFile&& file) 49 { 50 // Verify not assigning object to itself (a = std::move(a)) 51 if (this != &file) 52 { 53 // Delete temporary file owned by this object 54 remove(); 55 56 // Move temporary file path from other object, transferring ownership 57 path = std::move(file.path); 58 59 // Clear path in other object; after move path is in unspecified state 60 file.path.clear(); 61 } 62 return *this; 63 } 64 remove()65void TemporaryFile::remove() 66 { 67 if (!path.empty()) 68 { 69 // Delete temporary file from file system 70 fs::remove(path); 71 72 // Clear path to indicate file has been deleted 73 path.clear(); 74 } 75 } 76 77 } // namespace util 78 } // namespace pels 79 } // namespace openpower 80