2015-03-18 Corinna Vinschen * sec_auth.cc (get_server_groups): Drop unused passwd argument. Adjust calls throughout. (get_initgroups_sidlist): Ditto. (get_setgroups_sidlist): Ditto. (create_token): Ditto. (lsaauth): Ditto. * security.h (create_token): Adjust prototype to above change. (lsaauth): Ditto. (get_server_groups): Ditto. * grp.cc (get_groups): Adjust call to get_server_groups. * syscalls.cc (seteuid32): Adjust calls to lsaauth and create_token. 2015-03-17 Corinna Vinschen * grp.cc (internal_getgroups): Drop unused timeout parameter. * pwdgrp.h (internal_getgroups): Ditto in prototype. * uinfo.cc (internal_getlogin): Ditto in usage. 2015-03-17 Corinna Vinschen * spawn.cc (find_exec): Fix a name change in case of a symlink which can be opened as is. 2015-03-12 Jon TURNEY * exceptions.cc (stack_info): Add sigstackptr member. (walk): Unwind sigstackptr inside _sigbe and sigdelayed. * gendef (_sigdelayed_end): Add symbol to mark end of sigdelayed. 2015-03-13 Corinna Vinschen * include/cygwin/sys_time.h: Remove. Definitions moved to newlib's sys/time.h. 2015-03-13 Alexey Pavlov * net.cc (in6addr_any): Remove redundant braces. (in6addr_loopback): Ditto. 2015-03-12 Alexey Pavlov * include/cygwin/version.h: Fix typo. 2015-03-12 Corinna Vinschen * fhandler_socket.cc: Drop defining _BSDTYPES_DEFINED before including winsup.h. 2015-03-12 Takashi Yano * fhandler_tty.cc (fhandler_pty_master::close): Add code to make slave detect closure of master. Fix typo in error message. 2015-03-11 Corinna Vinschen * include/cygwin/types.h: Include 2015-03-11 Corinna Vinschen * autoload.cc (CreateEnvironmentBlock): Make loading non-fatal. 2015-03-11 Corinna Vinschen * autoload.cc (std_dll_init): Fix condition for breaking from DLL loading loop. 2015-03-10 Yaakov Selkowitz * include/stdint.h: Fix __x86_64__ conditional. 2015-03-05 Corinna Vinschen * tty.h (tty::set_master_ctl_closed): Rename from set_master_closed. (tty::is_master_closed): Drop method. * fhandler_tty.cc (fhandler_pty_slave::open): Remove code prematurely bailing out if master control thread is not running. (fhandler_pty_slave::read): Don't generate SIGHUP if master control thread is not running. (fhandler_pty_master::close): Rearrange code to avoid stopping master control thread twice in multi-threaded scenarios. 2015-03-05 Corinna Vinschen * fhandler.h (fhandler_base::get_echo_handle): New virtual method. (class fhandler_pty_master): Add echo_r and echo_w handles constituting read and write side of new echo pipe. * select.cc (peek_pipe): On pty masters, check additionally if input from the echo pipe is available. * fhandler_tty.cc (fhandler_pty_master::doecho): Drop output_mutex locking. Write output to echo pipe. (fhandler_pty_master::process_slave_output): Check if input is available in echo pipe and prefer to read from it, if so. (fhandler_pty_slave::write): Drop output_mutex locking. (fhandler_pty_master::fhandler_pty_master): Initialize echo pipe handles to NULL. (fhandler_pty_master::close): Close and NULL echo pipe handles. (fhandler_pty_master::setup): Create echo pipe, close in case of error. 2015-03-04 Corinna Vinschen * include/cygwin/version.h (CYGWIN_VERSION_DLL_MINOR): Bump to 36. 2015-03-03 Corinna Vinschen * msg.cc: Throughout, drop raising SIGSYS if cygserver is not running. * sem.cc: Ditto. * shm.cc: Ditto. 2015-03-03 Corinna Vinschen * common.din (issetugid): Export. * glob.cc (issetugid): Drop macro. * sec_auth.cc (issetugid): New exported function. * include/cygwin/version.h (CYGWIN_VERSION_API_MINOR): Bump. 2015-03-02 Corinna Vinschen * security.cc (get_attribute_from_acl): Don't spill Everyone permissions into group permissions if owner SID == group SID. (alloc_sd): Add parenthesis for clarity. 2015-02-28 Corinna Vinschen * uinfo.cc (pwdgrp::add_line): Return NULL if parsing a line failed. (pwdgrp::add_account_post_fetch): Check return value from add_line and return NULL if add_line returns NULL. 2015-02-27 Corinna Vinschen * security.cc (alloc_sd): For directories, mark inherited ACEs inheritable to better follow POSIX 1003.1e rules. 2015-02-27 Corinna Vinschen * sec_acl.cc (getacl): Add mask even if all group and secondary account permissions are 0. 2015-02-27 Corinna Vinschen * uinfo.cc (pwdgrp::fetch_account_from_windows): Drop redundant test for SidTypeUser. 2015-02-27 Corinna Vinschen * sec_acl.cc (setacl): Fix bug which leads to ACE duplication in case owner SID == group SID. (getacl): Reverse order of SID test against group or owner sid to prefer owner attributes over group attributes. Disable setting group permissions equivalent to owner permissions if owner == group. Add comment to explain why. Fix indentation. * security.cc (get_attribute_from_acl): Change type of local variables containing permission to mode_t. Apply deny mask to group if group SID == owner SID to avoid Everyone permissions to spill over into group permissions. Disable setting group permissions equivalent to owner permissions if owner == group. Add comment to explain why. * uinfo.cc (pwdgrp::fetch_account_from_windows): Allow user SID as group account if user is a "Microsoft Account". Explain why. Drop workaround enforcing primary group "Users" for "Microsoft Accounts". 2015-02-26 Corinna Vinschen * ldap.cc (cyg_ldap::wait): Call cygwait with cw_infinite timeout value and with cw_sig_restart instead of cw_sig_eintr. Drop useless _my_tls.call_signal_handler call. Return EIO if cygwait failed. 2015-02-26 Corinna Vinschen * posix_ipc.cc (ipc_mutex_lock): Revert unneeded call to signal handler. 2015-02-26 Corinna Vinschen * posix_ipc.cc (ipc_mutex_lock): Add bool parameter to influence if cygwait should be in EINTR or in restart mode. Call signal handler if in EINTR mode. (mq_getattr): Call ipc_mutex_lock in restart mode. (mq_setattr): Ditto. (mq_notify): Ditto. (_mq_send): Call ipc_mutex_lock in EINTR mode. (_mq_receive): Ditto. 2015-02-26 Corinna Vinschen * fhandler_termios.cc (fhandler_termios::line_edit): Fix condition for writing remaining bytes in readahead buffer in non-canonical mode. 2015-02-25 Corinna Vinschen * sec_acl.cc (setacl): Always grant default owner entry STANDARD_RIGHTS_ALL and FILE_WRITE_ATTRIBUTES access, too. 2015-02-25 Corinna Vinschen * fhandler_tape.cc (fhandler_dev_tape::_lock): Add cw_sig_restart to cygwait call. * thread.cc (pthread_mutex::lock): Ditto. (semaphore::_timedwait): Fix formatting. (semaphore::_wait): Ditto. * thread.h (fast_mutex::lock): Ditto. 2015-02-25 Corinna Vinschen * security.cc (alloc_sd): Don't apply temporary workaround for chmod to DEF_USER_OBJ, DEF_GROUP_OBJ, and DEF_OTHER_OBJ ACEs. 2015-02-25 Corinna Vinschen * fhandler_tty.cc (fhandler_pty_slave::read): Having no input is not an error condition for tcflush. 2015-02-25 Corinna Vinschen * security.cc (alloc_sd): Fix comment style. Remove code unused for years. 2015-02-25 Corinna Vinschen * security.cc (alloc_sd): Add temporary workaround which disallows any secondary user to have more permissions than the primary group in calls to chmod. Add comment to explain why. 2015-02-25 Corinna Vinschen * uinfo.cc (client_request_pwdgrp::client_request_pwdgrp): Add missing break in switch statement. 2015-02-24 Corinna Vinschen * ldap.h: Remove index macros. (class cyg_ldap): Remove members srch_msg and srch_entry. (cyg_ldap::get_string_attribute): Remove private method taking index argument. (cyg_ldap::get_num_attribute): Ditto. Add method taking attribute name. (cyg_ldap::get_primary_gid): Adjust to aforementioned change. (cyg_ldap::get_unix_uid): Ditto. (cyg_ldap::get_unix_gid): Ditto. * ldap.cc: Throughout, use msg and entry in place of srch_msg and srch_entry. (std_user_attr): Add sAMAccountName and objectSid. (group_attr): Ditto. (cyg_ldap::close): Drop handling of srch_msg and srch_entry. (cyg_ldap::get_string_attribute): Move earlier in file. (cyg_ldap::get_num_attribute): Ditto. (cyg_ldap::enumerate_ad_accounts): Add comments for clarity. Use group_attr or user_attr rather than sid_attr to fetch all desired attributes for an account right away. (cyg_ldap::next_account): Store found SID in last_fetched_sid to skip calls to fetch_ad_account from fetch_account_from_windows. (cyg_ldap::get_string_attribute): Remove method taking index argument. (cyg_ldap::get_num_attribute): Ditto. * pwdgrp.h (class pg_ent): Fix formatting. Add member dom. * passwd.cc (pg_ent::enumerate_ad): Store current flat domain name in dom. Construct fetch_acc_t argument from LDAP attributes and call fetch_account_from_windows with that. * userinfo.h (enum fetch_user_arg_type_t): Rename FULL_grp_arg to FULL_acc_arg. Change throughout. (struct fetch_acc_t): Rename from fetch_full_grp_t. Change throughout. (struct fetch_user_arg_t): Rename full_grp to full_acc. Change throughout. 2015-02-24 Corinna Vinschen * fhandler.h (class fhandler_base): Add was_nonblocking status flag. * fhandler.cc (fhandler_base::set_flags): Set was_nonblocking if the O_NONBLOCK flag has been specified. (fhandler_base_overlapped::close): Check for was_nonblocking instead of for is_nonblocking. Explain why. (fhandler_base::set_nonblocking): Set was_nonblocking if noblocking mode gets enabled. 2015-02-24 Ken Brown * include/sys/socket.h (sockatmark): Add prototype. 2015-02-23 Corinna Vinschen * userinfo.h (struct fetch_full_grp_t): Define only when building Cygwin itself. (struct fetch_user_arg_t): Ditto. 2015-02-23 Corinna Vinschen * autoload.cc (LsaLookupSids): Import. * cygserver_pwdgrp.h: Include userinfo.h. Drop workaround defining fetch_user_arg_type_t locally. * grp.cc (internal_getgrsid_cachedonly): New function. (internal_getgrfull): Ditto. (internal_getgroups): Rearrange function. Center around fetching all cached group info first, calling LsaLookupSids on all so far non-cached groups second. Pass all available info to new internal_getgrfull call. * pwdgrp.h: Include userinfo.h. Move definitions of fetch_user_arg_type_t and fetch_user_arg_t there. (pwdgrp::add_group_from_windows): Declare with getting full group info. Called from internal_getgrfull. * uinfo.cc (pwdgrp::add_group_from_windows): Define. (pwdgrp::fetch_account_from_line): Add default case. (pwdgrp::fetch_account_from_file): Ditto. (pwdgrp::fetch_account_from_windows): Handle FULL_grp_arg. (client_request_pwdgrp::client_request_pwdgrp): Add default case. * userinfo.h: New header. (enum fetch_user_arg_type_t): Add FULL_grp_arg. (struct fetch_full_grp_t): New datatype. 2015-02-23 Corinna Vinschen * grp.cc (internal_getgroups): Check for group attributes and Everyone sid before calling internal_getgrsid. 2015-02-23 Corinna Vinschen * cygwait.h (enum cw_wait_mask): Add cw_sig_restart. Add comments to explain the meaning of the possible values. * cygwait.cc (is_cw_sig_restart): Define. (is_cw_sig_handle): Check for cw_sig_restart as well. (cygwait): Restart always if cw_sig_restart is set. * thread.cc (pthread::join): Call cygwait with cw_sig_restart flag to avoid having to handle signals at all. 2015-02-23 Corinna Vinschen * cygwait.cc (cygwait): Move setting res to WAIT_SIGNALED to clarify when WAIT_SIGNALED is returned to the caller. 2015-02-23 Corinna Vinschen * winsup.h (SIGTOMASK): Add cast to sigset_t to avoid int overflow. 2015-02-20 Corinna Vinschen * grp.cc (internal_getgroups): Take additional timeout_ns parameter. Restrict fetching group account entries from user token groups by timeout_ns 100ns-intervals. Add preceding comment to explain why. * pwdgrp.h (internal_getgroups): Align prototype. * times.cc (GetTickCount_ns): New function. * uinfo.cc (internal_getlogin): Call internal_getgroups wih 300ms timeout. * winsup.h (GetTickCount_ns): Declare. 2015-02-19 Jon TURNEY * Makefile.in (sigfe.o): Use CFLAGS. 2015-02-19 Jon TURNEY * include/cygwin/stdlib.h (initstate, random, setstate, srandom): Check if __XSI_VISIBLE is set by sys/cdefs.h, rather than testing for _XOPEN_SOURCE directly, to work correctly when _GNU_SOURCE is set. 2015-02-19 Corinna Vinschen * sec_acl.cc (setacl): Always grant owner FILE_WRITE_ATTRIBUTES access. 2015-02-18 Corinna Vinschen * ldap.cc (struct cyg_ldap_search): Add scope member. (cyg_ldap::search_s): Add parameter scope. Use as LDAP search scope instead of fixed LDAP_SCOPE_SUBTREE scope. (ldap_search_thr): Call cyg_ldap::search_s with scope from argument. (cyg_ldap::search): Add parameter scope and fill in to cyg_ldap_search. (cyg_ldap::fetch_ad_account): Call search with LDAP_SCOPE_SUBTREE scope. (cyg_ldap::fetch_posix_offset_for_domain): Call search with LDAP_SCOPE_ONELEVEL scope. (cyg_ldap::fetch_unix_sid_from_ad): Call search with LDAP_SCOPE_SUBTREE scope. (cyg_ldap::fetch_unix_name_from_rfc2307): Ditto. * ldap.h (cyg_ldap::search): Align prototype to above change. (cyg_ldap::search_s): Ditto. 2015-02-18 Corinna Vinschen * ldap.cc: Macro-ize filter expressions. Use throughout to compute required filter buffer size if filter is a local buffer. 2015-02-17 Corinna Vinschen * ldap.cc (cyg_ldap::fetch_posix_offset_for_domain): Drop stray system_printf. 2015-02-17 Corinna Vinschen * ldap.h (class cyg_ldap): Rename rootdse to def_context. Change throughout. * ldap.cc (cyg_ldap::open): Fix debug output. (cyg_ldap::fetch_ad_account): Rename rdse to base. Restrict LDAP query to users and groups only. (cyg_ldap::enumerate_ad_accounts): Rearrange filter expression for user accounts. (SYSTEM_CONTAINER): New macro. (cyg_ldap::fetch_posix_offset_for_domain): Set base in LDAP search to the "System" container in the default naming context to restrict the search scope. (cyg_ldap::fetch_unix_sid_from_ad): Add objectCategory=Person to search filter for users. 2015-02-16 Corinna Vinschen * spawn.cc (find_exec): Extend preceeding comment to explain more detailed what's going on in this function. Overwrite potential symlink target with original path. 2015-02-15 Corinna Vinschen * i686.din (__mempcpy): Move symbol export from here... * common.din (__mempcpy): ... to here. 2015-02-14 Corinna Vinschen * path.h (path_conv): Make path_flags private. Rename known_suffix to suffix and make private. Rename normalized_path to posix_path and make privtae. Accommodate name changes throughout in path_conv methods. (path_conv::known_suffix): New method. Use throughout instead of accessing suffix directly. (path_conv::get_win32): Constify. (path_conv::get_posix): New method to read posix_path. Use throughout instead of accessing normalized_path directly. (path_conv::set_posix): Rename from set_normalized_path. Accommodate name change throughout. * spawn.cc (find_exec): Return POSIX path, not Win32 path. 2015-02-12 Corinna Vinschen * sec_acl.cc (setacl): Introduce bool array "invalid" to note the invalidation of incoming acl entries while iterating over them. 2015-02-12 Corinna Vinschen * cygheap.h (cygheap_pwdgrp::get_home): Add dnsdomain parameter to declaration in ldap-related method. (cygheap_pwdgrp::get_shell): Ditto. (cygheap_pwdgrp::get_gecos): Ditto. * ldap.cc (cyg_ldap::open): Use NO_ERROR instead of 0. (cyg_ldap::close): Reset last_fetched_sid. (cyg_ldap::fetch_ad_account): Return immediately if sid is the same as last_fetched_sid. Open LDAP connection from here. Move initialization of rdse after open call. Set last_fetched_sid if LDAP call was successful. * ldap.h (class cyg_ldap): Add member last_fetched_sid. (cyg_ldap::cyg_ldap): Initialize last_fetched_sid. (cyg_ldap::is_open): New inline method. * uinfo.cc (cygheap_pwdgrp::init): Drop initialization of db_home, db_shell and db_gecos with "cygwin desc", thus only using the fallback by default. (fetch_windows_home): Add parameter dnsdomain. Call cyg_ldap::fetch_ad_account if required. (fetch_from_path): Add parameter dnsdomain. Call fetch_windows_home accordingly. (cygheap_pwdgrp::get_home): Accomodate call to fetch_windows_home. Add dnsdomain parameter in ldap-related method. Call cyg_ldap::fetch_ad_account if required. (cygheap_pwdgrp::get_shell): Ditto. (cygheap_pwdgrp::get_gecos): Ditto. (pwdgrp::fetch_account_from_windows): Drop cyg_ldap::open call prior to cyg_ldap::fetch_ad_account call. Set is_current_user to true if we're handling the current user account. Make sure to perform the LDAP calls only for users, and only if required. 2015-02-11 Corinna Vinschen * flock.cc (fhandler_base::lock): Convert accidental system_printf to debug_printf in case of non-matching file modes. Clear up debug output. 2015-02-11 Corinna Vinschen * dlfcn.cc (check_path_access): Drop FE_NATIVE from find_exec call. (gfpod_helper): Drop equality sign from environment variable name in call to check_path_access. * exec.cc (execlp): Drop equality sign from environment variable name in call to find_exec. (execvp): Ditto. (execvpe): Ditto. * path.h (enum fe_types): Drop FE_NATIVE. (find_exec): Rename third paramter in declaration from search. Drop equality sign from default value. * spawn.cc (perhaps_suffix): Add PC_POSIX to path_conv::check call. (find_exec): Simplify function. Iterate over POSIX pathlist rather than Windows pathlist. Drop handling of FE_NATIVE flag. Always fill posix path of incoming path_conv buf, unless FE_NNF flag is given. (av::setup): Drop equality sign from environment variable name in call to find_exec. Call unshift with normalized_path. * winf.cc (av::unshift): Drop conv parameter and code converting Windows to POSIX path. * winf.h (av::unshift): Accommodate prototype. 2015-02-10 Corinna Vinschen * syscalls.cc (fhandler_base::stat_fixup): Generate unique inode number for /dev/tty under all circumstances. Add to comment. 2015-02-06 Corinna Vinschen * common.din: Export cabsl, cimagl, creall, finitel, hypotl, sqrtl. * include/cygwin/version.h (CYGWIN_VERSION_API_MINOR): Bump. 2015-02-06 Corinna Vinschen * include/cygwin/version.h (CYGWIN_VERSION_DLL_MINOR): Bump to 35. 2015-02-06 Corinna Vinschen * fhandler_proc.cc (format_proc_cpuinfo): Enable multi-core fields on Intel CPUs. 2015-02-04 Corinna Vinschen * common.din (wcstold): Export. * include/cygwin/version.h (CYGWIN_VERSION_API_MINOR): Bump. 2015-02-03 Corinna Vinschen * mkvers.sh: Automate generating the copyright date in the version resource. * winver.rc: Ditto. 2015-01-28 Corinna Vinschen * Makefile.in (VERSION_OFILES): New variable containing object files with version information. Use throughout. (clean): Drop winver_stamp. (version.cc winver.o): Drop empty rule. (winver_stamp): Convert to rule targeting version.cc and winver.o directly. Drop touching winver_stamp. Fix typo. 2015-01-24 Corinna Vinschen * uname.cc (uname): Shorten "WOW64" to "WOW" to account for the new Windows 10 OS version "10.0" starting with preview build 9926. 2015-01-23 Pierre A. Humblet * net.cc (cygwin_inet_pton): Declare. (gethostby_specials): New function. (gethostby_helper): Change returned addrtype in 4-to-6 case. (gethostbyname2): Call gethostby_specials. 2015-01-22 Corinna Vinschen * fhandler.h (class fhandler_process): Add fd_type member. * fhandler_process.cc (process_tab): Fix indentation. (fhandler_process::exists): Rely on format_process_fd returning file type in fd_type. (struct process_fd_t): Add fd_type member. (fhandler_process::fill_filebuf): Allow format_process_fd to set this->fd_type member. (format_process_fd): Fix path evaluation to allow recognizing trailing path components. Fix check for file descriptor path component. Return virt_symlink in fd_type if no trailing path compenents exist, return virt_fsdir otherwise and copy full resulting path into destbuf. * path.cc (path_conv::check): If /proc/$PID/fd symlink has trailing path components, reparse resulting path as if it's the incoming path. Add comment to wail over the outdated and hackish check method, and to explain what we do here. 2015-01-21 Corinna Vinschen * uinfo.cc (pwdgrp::fetch_account_from_windows): Allow fetching gid, home, shell and gecos info from NT4 domain. 2015-01-21 Corinna Vinschen * sec_auth.cc (get_logon_server): Constify domain parameter. * security.h (get_logon_server): Same in prototype. 2015-01-20 Corinna Vinschen * common.din (sockatmark): Export. * net.cc (sockatmark): New function. * include/cygwin/version.h (CYGWIN_VERSION_API_MINOR): Bump. 2015-01-19 Corinna Vinschen * cygserver_ipc.h (ipc_retval): Add default constructor. (class thread): struct->class. Add prototypes for new private methods dup_signal_arrived and close_signal_arrived. Implement constructor and destructor. 2015-01-16 Marco Atzeri Corinna Vinschen * gendef: Export _sigbe on 64 bit as well. * malloc_wrapper.cc (free): In malloc_printf, call caller_return_address instead of __builtin_return_address. (malloc): Ditto. (realloc): Ditto. (calloc): Ditto. * miscfuncs.cc (__caller_return_address): New function. * miscfuncs.h (caller_return_address): New macro calling __caller_return_address. (__caller_return_address): Add prototype. 2015-01-14 Corinna Vinschen * uinfo.cc (fetch_windows_home): Disable fetching from homeDrive or usri3_home_dir_drive. Add comment. 2015-01-14 Corinna Vinschen * environ.cc (renv_arr): Drop variables not usually in a Windows environment and all variables being uppercase anyway. But keep TMP and TEMP for paranoia. 2015-01-14 Corinna Vinschen * environ.cc (build_env): When merging the user's Windows environment, explicitely skip the variables needing conversion to avoid collisions. Extend comment to explain. 2015-01-13 Corinna Vinschen * uinfo.cc (pwdgrp::fetch_account_from_windows): Drop code from 2014-11-17, always prepending domain to NT SERVICE accounts when searching by name. Fix test expression to allow fully qualified names for NT SERVICE accounts. Extend comment to explain a bit. 2015-01-12 Pierre A. Humblet * minires-os-if.c (cygwin_query): Change questions into answers. 2015-01-08 Corinna Vinschen * cygheap.h (cygheap_pwdgrp::get_shell): Add sid to argument list. (cygheap_pwdgrp::get_gecos): Ditto. * uinfo.cc (fetch_windows_home): Accept cyg_ldap and PUSER_INFO_3 arguments, and fetch db home dir values right here. (fetch_from_path): Accept cyg_ldap, PUSER_INFO_3 pointers and sid arguments. Add '%H' format specifier to fetch Windows home dir in POSIX notation. (cygheap_pwdgrp::get_home): Accommodate changes to fetch_windows_home and fetch_from_path. (cygheap_pwdgrp::get_shell): Ditto. (cygheap_pwdgrp::get_gecos): Ditto. (pwdgrp::fetch_account_from_windows): Accommodate sid argument to cygheap_pwdgrp::get_shell and cygheap_pwdgrp::get_gecos. 2015-01-08 Corinna Vinschen * include/cygwin/socket.h (struct cmsghdr): Redefine cmsg_len as type size_t. Add comment to explain why. 2015-01-08 Corinna Vinschen * localtime.cc (__cygwin_gettzoffset): New function for access from newlib. (__cygwin_gettzname): Ditto. 2015-01-07 Corinna Vinschen * localtime.cc (tzload): Fix loading latest timezone offsets into tzinfo from zoneinfo files. Add comment to explain what we do. (tzparse): Add more comments to explain in case of loading timezone offset from other sources.