2006-11-25 05:53:49 TZ can not be read ??

w w (CHINA)

Message: 16880 Under the uClinux version 2006R2 and toolchain 2006R2 , the file /etc/TZ can not read by the uClinux kernel. I can "export TZ=GMT-8" to set the time zone, but when I run "echo GMT-8 > /etc/TZ" and reboot the system, the time zone is the UTC, it hasn't changed. I have selected the choice

[*] Support time zones

[*] Always load from file

and in uClibc

[*] Enable caching of the last valid timezone 'TZ' string

[*] Enable '/etc/TZ' file support to set a default timezone (uClibc-specific)

[*] Repeatedly read the '/etc/TZ' file

(/etc/TZ) Path to the 'TZ' file for setting the global timezone

What should I do ? thank you !!

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2006-11-26 21:16:33 RE: TZ can not be read ??

Mike Frysinger (UNITED STATES)

Message: 16896 try running `strace date` and see if the /etc/TZ file is actually read

the distribution no longer builds uClibc separately; it will install the uClibc that is part of the toolchain so if you need to make uClibc changes, you need to update your toolchain accordingly

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2006-11-27 05:19:50 RE: TZ can not be read ??

w w (CHINA)

Message: 16918 Thank you Mike!

I can get the right time zone with serial console, it can be read from file /etc/TZ when the system boot.

But when I telnet the system, I find that in my telnet shell, the time zone is UTC.

What's the matter ?

I can run "export TZ=GMT-8" to set the time zone, but I want to get the right value when i telnet my system and do't set anything.

Is there any suggestions ?

Thank you !!

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2006-11-28 02:26:17 RE: TZ can not be read ??

w w (CHINA)

Message: 16984 Is there no one know the question ?

I can get the right time zone from serial console, but can not get it from telnet , why ?

Thank you !!

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2006-11-28 09:45:03 RE: TZ can not be read ??

Michele d'Amico (ITALY)

Message: 16996 Hi w w,

I guess that telnetd don't spawn the TZ environment variable. If you are

interested in you could investigate/debug it by yourself.

Regards

--Michele

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2006-11-28 09:55:12 RE: TZ can not be read ??

Yi Li (CHINA)

Message: 16998 Agree.

Please do some investigation (search the web at least) by yourself

before asking questions.

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2006-11-28 14:38:13 RE: TZ can not be read ??

Robin Getz (UNITED STATES)

Message: 17012 Yi:

In our cvs ./uClinux-dist/user/telnetd/sys_term.c

void init_env(void) {

#if 0

char **envp;

envp = envinit;

if ((*envp = getenv("TZ"))!=NULL)

*envp++ -= 3;

#ifdef CRAY

else *envp++ = "TZ=GMT0";

#endif

*envp = 0;

environ = envinit;

#endif

}

In a recent version of netkit telnet/telnetd/sys_term.c from ftp://ftp.uk.linux.org/pub/linux/Networking/netkit/netkit-telnet-0.17.tar.gz

void init_env(void) {

char **envp;

envp = envinit;

if ((*envp = getenv("TZ"))!=NULL)

*envp++ -= 3;

*envp = 0;

environ = envinit;

}

Can you check on the main uclinux-dev mailing list, why the TZ is not set properly, or if by closer inspection, our telnetd is old and out of date - can you test the new one, and update cvs?

Thanks

-Robin

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2007-10-28 17:32:33 RE: TZ can not be read ??

Øyvind Kaurstad (NORWAY)

Message: 46070 I'm bumping this old thread instead of starting a new one.

I am having a similar issue. I want to have the correct timezone, be it on the serial console or in a telnet session. If I modify the TZ file, I get what I want on the serial console, but not in a telnet session. In the serial console the TZ-variable is present, but not in the telnet console. However, several other environment variables are correctly exported in the telnet session, but I am not sure which code is responsible for that.

I'd like to have the TZ variable automatically exported in a telnet session, where is the correct place to do that? Changing #if 0 to #if 1 in init_env in sys_term.c makes no difference, since the getenv("TZ")-call returns NULL.

On the serial console:

root:~> export

export HOME

export SHELL

export TZ

export PATH

export TERM

In the telnet session:

root:~> export

export PATH

export HOME

export SHELL

export DISPLAY

export TCPLOCALPORT

export TCPREMOTEPORT

export TCPREMOTEIP

export TCPLOCALIP

export PROTO

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2007-11-01 23:51:24 RE: TZ can not be read ??

w w (CHINA)

Message: 46253

I have the same problem, but I can not resolve the question. Maybe there is something wrong about the toolchain, because I can get right result in uClinux version 2006R1.

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2009-10-21 03:56:51 RE: TZ can not be read ??

arthur chan (CHINA)

Message: 81527

whatever libc version you use, just enclose it in a C routin, it's Ok, what I do is to read the configuration file before

system();

1 #include <stdio.h>

2 #include <stdlib.h>

3 #include <unistd.h>

5 #include <fcntl.h>

6 #include <sys/ioctl.h>

7 #include <sys/stat.h>

8 #include <string.h>

10 #define TZ_max_len 32

11 int main(int argc, char *argv[])

12 {

13 int fd_etc_TZ;

14 int ret;

15 char TZ_buf[TZ_max_len];

16 char *p;

18 p = getenv("TZ");

19 printf("this what is %s\n",p);

21 fd_etc_TZ = open("/etc/TZ",O_RDONLY, S_IRUSR | S_IWUSR | S_IXUSR);

22 if (fd_etc_TZ < 0) {

23 printf("open /etc/TZ err, return\n");

24 return -1;

25 }

27 ret = read(fd_etc_TZ, TZ_buf, TZ_max_len);

28 if (ret < 0) {

29 printf("read /etc/TZ err, return\n");

30 return -1;

31 }

33 p = getenv("TZ");

34 printf("this what b4 is %s\n",p);

35 system("date");

36 system("hwclock");

38 system("hwclock --systohc");

39 printf("after\n");

40 system("hwclock");

42 // putenv("TZ=CST-8");

43 setenv("TZ", (const char*) TZ_buf, 1);

45 p = getenv("TZ");

46 printf("this what after is %s\n",p);

47 system("date");

49 return 0;

50 }

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2011-07-25 08:38:34 RE: TZ can not be read ??

Manish Gajjaria (INDIA)

Message: 102659

Using the putenv("TZ=CST-8") command, I am able to set the Timezone value to the desired timezone.

However, while doing the date command on serial terminal / telnet the value shown is always UTC time value; and also the file /etc/TZ is not updated with the timezone information mentioned under putenv().

I have enabled the Configuration options mentioned previously.

Also, across reboots the Timezone info is always reset to UTC; how can I make the Timezone value persist across reboots?

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2011-07-25 23:21:24 RE: TZ can not be read ??

Aaron Wu (CHINA)

Message: 102660

Did you use non-volatile file system? also please do NOT reply to ancient topic, create a new one please.