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Returning Strings from C program to Unix shell script

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# 8  
Old 08-22-2005
In place of
clear_text_password=$(my_C_program)

clear_text_password=`my_C_program`
can be used
# 9  
Old 12-29-2005
Hey, you had the idea yourself, sending the password string to environment. Go aheas and do a
strcpy(string, env_pass_var);
strcat(string, "=");
strcat(string, c_pass_var);
putenv(string)

access this in shell script by $value_of_env_pass_var
# 10  
Old 12-29-2005
Quote:
Originally Posted by linuxpenguin
Hey, you had the idea yourself, sending the password string to environment. Go aheas and do a
strcpy(string, env_pass_var);
strcat(string, "=");
strcat(string, c_pass_var);
putenv(string)

access this in shell script by $value_of_env_pass_var
Will Not Work™©®.

The C program inherits a copy of the environment variables of the shell, and the changes don't go back, they stay in the C program. The changes would be inherited by other programs the C program lanuches, but not the original shell.
# 11  
Old 12-30-2005
Corona is correct - the C code runs in a child process. Any environment changes it makes are lost when it exits.

Whar I'm not so sure about is:
Quote:
clear_text_password=$(my_C_program | awk '/DECRYPTED_DATA/{print $2}' )
if [[ $? -eq 0 ]] ; then
#The password was returned correctly
The status that will be in $? is the status from the last process in the pipe -- awk,
not my_C_program.
# 12  
Old 12-30-2005
yep, I got carried away by the idea of putting the variable in the environment. Thanks Corona, Thanks Jim for the eye opener Smilie
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