Just a super dumb file test, to have a controlled environment where every syscall is accounted for.
| 37 | // Just a super dumb file test, to have a controlled environment |
| 38 | // where every syscall is accounted for. |
| 39 | static void writeFile(int argc, const char** argv) { |
| 40 | ssize_t fileSize = -1; |
| 41 | ssize_t bufSize = -1; // if -1, all in one go |
| 42 | const char* filename = NULL; |
| 43 | bool closeAndReopen = false; |
| 44 | bool stat = false; |
| 45 | |
| 46 | for (int i = 0; i < argc; i++) { |
| 47 | if (std::string(argv[i]) == "-buf-size") { |
| 48 | if (i+1 >= argc) { badUsage("No argument after -buf-size"); } i++; |
| 49 | bufSize = strtoull(argv[i], NULL, 0); |
| 50 | if (bufSize == ULLONG_MAX) { |
| 51 | badUsage("Bad -buf-size: %d (%s)", errno, strerror(errno)); |
| 52 | } |
| 53 | } else if (std::string(argv[i]) == "-size") { |
| 54 | if (i+1 >= argc) { badUsage("No argument after -size"); } i++; |
| 55 | fileSize = strtoull(argv[i], NULL, 0); |
| 56 | if (fileSize == ULLONG_MAX) { |
| 57 | badUsage("Bad -size: %d (%s)", errno, strerror(errno)); |
| 58 | } |
| 59 | } else if (std::string(argv[i]) == "-close-open") { |
| 60 | closeAndReopen = true; |
| 61 | } else if (std::string(argv[i]) == "-stat") { |
| 62 | stat = true; |
| 63 | } else { |
| 64 | if (filename != NULL) { badUsage("Filename already specified: %s", filename); } |
| 65 | filename = argv[i]; |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | if (bufSize < 0) { bufSize = fileSize; } |
| 70 | if (fileSize < 0 || filename == NULL) { badUsage("No -size specified"); } |
| 71 | |
| 72 | printf("writing %ld bytes with bufsize %ld to %s\n", fileSize, bufSize, filename); |
| 73 | |
| 74 | int fd = open(filename, O_CREAT | O_WRONLY | O_TRUNC, 0666); |
| 75 | if (fd < 0) { |
| 76 | die("could not open file %s: %d (%s)", filename, errno, strerror(errno)); |
| 77 | } |
| 78 | |
| 79 | if (closeAndReopen) { |
| 80 | if (close(fd) < 0) { |
| 81 | die("could not close file %s: %d (%s)", filename, errno, strerror(errno)); |
| 82 | } |
| 83 | fd = open(filename, O_CREAT | O_WRONLY | O_TRUNC, 0666); |
| 84 | if (fd < 0) { |
| 85 | die("could not reopen file %s: %d (%s)", filename, errno, strerror(errno)); |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | uint8_t* buffer = (uint8_t*)malloc(bufSize); |
| 90 | if (buffer == NULL) { |
| 91 | die("could not allocate: %d (%s)", errno, strerror(errno)); |
| 92 | } |
| 93 | |
| 94 | uint64_t start = nanosNow(); |
| 95 | |
| 96 | ssize_t toWrite = fileSize; |