73         mSettingsFd = open(fileName, O_RDWR | O_CREAT | O_CLOEXEC, 0600);  in Init()
76     VerifyOrDie(mSettingsFd != -1, OT_EXIT_ERROR_ERRNO);  in Init()
78 …for (off_t size = lseek(mSettingsFd, 0, SEEK_END), offset = lseek(mSettingsFd, 0, SEEK_SET); offse…  in Init()
84         rval = read(mSettingsFd, &key, sizeof(key));  in Init()
87         rval = read(mSettingsFd, &length, sizeof(length));  in Init()
91         VerifyOrExit(offset == lseek(mSettingsFd, length, SEEK_CUR), error = OT_ERROR_PARSE);  in Init()
97         VerifyOrDie(ftruncate(mSettingsFd, 0) == 0, OT_EXIT_ERROR_ERRNO);  in Init()
105     VerifyOrExit(mSettingsFd != -1);  in Deinit()
106     VerifyOrDie(close(mSettingsFd) == 0, OT_EXIT_ERROR_ERRNO);  in Deinit()
107     mSettingsFd = -1;  in Deinit()
119     OT_ASSERT(mSettingsFd >= 0);  in Get()
121     size   = lseek(mSettingsFd, 0, SEEK_END);  in Get()
122     offset = lseek(mSettingsFd, 0, SEEK_SET);  in Get()
131         rval = read(mSettingsFd, &key, sizeof(key));  in Get()
134         rval = read(mSettingsFd, &length, sizeof(length));  in Get()
149 …         VerifyOrExit(read(mSettingsFd, aValue, readLength) == readLength, error = OT_ERROR_PARSE);  in Get()
164         VerifyOrExit(offset == lseek(mSettingsFd, length, SEEK_CUR), error = OT_ERROR_PARSE);  in Get()
175     OT_ASSERT(mSettingsFd >= 0);  in Set()
201     OT_ASSERT(mSettingsFd >= 0);  in Add()
203     size   = lseek(mSettingsFd, 0, SEEK_END);  in Add()
208         VerifyOrDie(0 == lseek(mSettingsFd, 0, SEEK_SET), OT_EXIT_ERROR_ERRNO);  in Add()
229     OT_ASSERT(mSettingsFd >= 0);  in Delete()
231     size   = lseek(mSettingsFd, 0, SEEK_END);  in Delete()
232     offset = lseek(mSettingsFd, 0, SEEK_SET);  in Delete()
245         rval = read(mSettingsFd, &key, sizeof(key));  in Delete()
248         rval = read(mSettingsFd, &length, sizeof(length));  in Delete()
257 …             VerifyOrExit(offset == lseek(mSettingsFd, length, SEEK_CUR), error = OT_ERROR_FAILED);  in Delete()
264 …             VerifyOrExit(offset == lseek(mSettingsFd, length, SEEK_CUR), error = OT_ERROR_FAILED);  in Delete()
305 void SettingsFile::Wipe(void) { VerifyOrDie(0 == ftruncate(mSettingsFd, 0), OT_EXIT_ERROR_ERRNO); }  in Wipe()
334         ssize_t  rval  = read(mSettingsFd, buffer, count);  in SwapWrite()
353     VerifyOrDie(0 == close(mSettingsFd), OT_EXIT_ERROR_ERRNO);  in SwapPersist()
357     mSettingsFd = aFd;  in SwapPersist()