Let me understand. You call putenv() inside a program that relies on LD_LIBRARY_PATH?
You do know that dld() opens the runtime libraries BEFORE your putenv() code is called?
How else could it access the external code for putenv? putenv is linked as a symbol reference that has to be dereferenced at runtime.
So. Part of exectuable image activation is opening the runtime libraries. Do you have truss or strace or trace on your machine? If so, run your code under it. Note that before the executable runs the stuff you wrote it does a lot of file mapping and file opening. Most of that is shared libraries.
One way -
Instead of all this pain, statically link your exectuable against the library that now requiresLD_LIBRARY_PATH. Usually this means supplying the name of the .a form of the library on the command line (or makefile)
Now, you do not need LD_LIBRARY_PATH in order to use liboddlibrary
I'm having an issue when I export within my program. I'm getting the variable name, not the variable value. I have a configuration file (config.txt) that has the values of the variables set as so:
set -a
export ARCHIVEPOSourceDir="/interfaces/po/log /interfaces/po/data"
export... (2 Replies)
I'm trying to open an xwindow on my Sun server. What am I doing wrong?
# echo $SHELL
/sbin/sh
#
# export DISPLAY=localhost:0.0
DISPLAY=localhost:0.0: is not an identifier
Thank you! (1 Reply)
Hi, I m trying to change the env variable from the c program which inturn calls another c executable. i m using the putenv function but it does not set the value as required , it overwrites the values with some other values...
i m using following cmd's to set the env variable FULL_PATH :
... (3 Replies)
Hi Guys,
I am using the korn shell. I have an environments files where I have defined a variable
export START_TIME=060000
export END_TIME=220000
I source this environments file into one of my scripts.
The problem is that when I try to use this variable, I cannot get to use this variable as a... (2 Replies)
Hi
I have a pass a variable from one script to another.
Here are my scripts
Script #1 ./profile
#!/bin/sh
export NAME="Hello"
Script #2 ./test
#!/bin/sh
./profile
echo $NAME
when I run ./test .. i am not getting anything .. why is that? (5 Replies)
Hi, Unix Gurus,
I have a problem need help. I have a script to generate environment variable code same as following:
oracle_sid=abcd
export oracle_sid
when I execute this code with command ./script_nane it succeeded.
when I try to find it with env command or echo $oracle_sid, it does not show... (5 Replies)
I am relatively new to exporting variables, and I just can't seem to make this count work. What I have is the following:
TOTAL=$($IMAGELIST -backupid $IM -U |gawk '{print $5}' |tail -1)|gawk '{print $6}'
RESTORED=$($BPDBJOBS -most_columns -jobid $JOBS |cut -f15 -d,) |gawk '{print $6}'
export... (7 Replies)
Hello,
Please see the script found in my computer below. (Ubuntu 14.04)
#!/bin/sh
export APP_DIR="/home/appname"
monitorscript="$APP_DIR""/monitor.sh"
ps cax | grep monitor.sh > /dev/null
if ; then
echo "monitor.sh is running"
else
"$monitorscript"
fi
My question is regarding EXPORT... (3 Replies)
Discussion started by: baris35
3 Replies
LEARN ABOUT CENTOS
putenv
PUTENV(3) Linux Programmer's Manual PUTENV(3)NAME
putenv - change or add an environment variable
SYNOPSIS
#include <stdlib.h>
int putenv(char *string);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
putenv(): _SVID_SOURCE || _XOPEN_SOURCE
DESCRIPTION
The putenv() function adds or changes the value of environment variables. The argument string is of the form name=value. If name does not
already exist in the environment, then string is added to the environment. If name does exist, then the value of name in the environment
is changed to value. The string pointed to by string becomes part of the environment, so altering the string changes the environment.
RETURN VALUE
The putenv() function returns zero on success, or nonzero if an error occurs. In the event of an error, errno is set to indicate the
cause.
ERRORS
ENOMEM Insufficient space to allocate new environment.
CONFORMING TO
SVr4, POSIX.1-2001, 4.3BSD.
NOTES
The putenv() function is not required to be reentrant, and the one in libc4, libc5 and glibc 2.0 is not, but the glibc 2.1 version is.
Description for libc4, libc5, glibc: If the argument string is of the form name, and does not contain an '=' character, then the variable
name is removed from the environment. If putenv() has to allocate a new array environ, and the previous array was also allocated by
putenv(), then it will be freed. In no case will the old storage associated to the environment variable itself be freed.
The libc4 and libc5 and glibc 2.1.2 versions conform to SUSv2: the pointer string given to putenv() is used. In particular, this string
becomes part of the environment; changing it later will change the environment. (Thus, it is an error is to call putenv() with an auto-
matic variable as the argument, then return from the calling function while string is still part of the environment.) However, glibc
2.0-2.1.1 differs: a copy of the string is used. On the one hand this causes a memory leak, and on the other hand it violates SUSv2. This
has been fixed in glibc 2.1.2.
The 4.4BSD version, like glibc 2.0, uses a copy.
SUSv2 removes the const from the prototype, and so does glibc 2.1.3.
SEE ALSO clearenv(3), getenv(3), setenv(3), unsetenv(3), environ(7)COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
GNU 2013-04-19 PUTENV(3)