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tuxreadenv(3)

Name

tuxreadenv-add variables to the environment from a file

Synopsis

#include <atmi.h> 
int tuxreadenv(char *file, char *label)

Description

tuxreadenv reads a file containing environment variables and adds them to the environment, independent of platform. These variables are available using tuxgetenv(3) and can be reset using tuxputenv(3).

The format of the environment file is as follows.

• Any leading space or tab characters on each line are ignored and are not considered in the following points.

• Lines containing variables to be put into the environment are of the form

variable=value

or

set variable=value

where variable must begin with an alphabetic or underscore character and contain only alphanumeric or underscore characters, and value may contain any character except newline.

• Within the value, strings of the form ${env} are expanded using variables already in the environment (forward referencing is not supported and if a value is not set, the variable is replaced with the empty string). Backslash (\) may be used to escape the dollar sign and itself. All other shell quoting and escape mechanisms are ignored and the expanded value is placed into the environment.

• Lines beginning with slash (/), pound sign (#), semicolon (;), or exclamation point (!) are treated as comments and ignored. Lines beginning with other characters besides these comment characters, a left square bracket, or an alphabetic or underscore character are reserved for future use; their use is undefined.

• The file is partitioned into sections by lines beginning with left square bracket ([), which acts as a label. The label will be silently truncated if longer than 31 characters. The format of a label is

  [label] 

  where label follows the same rules for variable above (lines with invalid label values are ignored).

• Variable lines between the top of the file and the first label are put into the environment for all labels (this is the global section). Other variables are put into the environment only if the label matches the label specified for the application. A label of [] will indicate the global section.

If file is NULL, then a default file name is used. The fixed file names are as follows:

DOS, Windows, OS2, NT: C:\TUXEDO\TUXEDO.ENV
MAC: TUXEDO.ENV in the system preferences directory
NETWARE: SYS:SYSTEM\TUXEDO.ENV
POSIX: /usr/tuxedo/TUXEDO.ENV or /var/opt/tuxedo/TUXEDO.ENV

If label is NULL, then only variables in the global section are put into the environment. For other values of label, the global section variables plus any variables in a section matching the label are put into the environment.

An error message is printed to the userlog() if there is a memory failure, if a non-null file name does not exist, or if a non-null label does not exist.

Example

Here is an example environment file.

TUXDIR=/usr/tuxedo
[application1]
;this is a comment
/* this is a comment */
#this is a comment
//this is a comment
FIELDTBLS=app1_flds
FLDTBLDIR=/usr/app1/udataobj
[application2]
FIELDTBLS=app2_flds
FLDTBLDIR=/usr/app2/udataobj

Return Values

tuxreadenv() returns non-zero if it was unable to obtain enough space via malloc for an expanded environment or was unable to open and read a non-NULL filename, otherwise zero.

Portability

In the DOS, Windows, OS/2, and NetWare environments, tuxreadenv() converts all environment variable names to upper case.

See Also

tuxgetenv(3), tuxputenv(3)

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