US Robotics USR2410 Manuel d'installation télécharger pdf (Page 57)

6. 2. Network Proﬁle Management 53

#start fvwm as window/session manager

fvwm

Note: Contrary to popular belief, the existence of the environment variable PS1 does not indicate an interactive

shell. If the current shell is the non-interactive child of an interactive shell, it inherits PS1 from the parent shell.

We hav e to test the shell ﬂags for interactivity.

Source of /usr/local/bin/readenv:

/* readenv.c

*alittle hack to read a ﬁle containing statements like

*export VAR=VALUE

*and then print them as

*setenv VAR VALUE

*tostdout.

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

int main (int argc, char **argv)

{

char string[2048], *var, *val;

FILE *ﬁle;

if ( argc != 2 ) return EXIT_FAILURE;

if ( (ﬁle = fopen(argv[1], "r")) == NULL ) return EXIT_FAILURE;

{

fgets(string, sizeof(string), ﬁle);

if ( !feof(ﬁle) )

{

val = strstr(string, "export");

strsep(&val, " ");

var = strsep(&val, "=");

if ( var && val ) printf("setenv %s %s;", var, val);

}

while (!feof(ﬁle));

fclose(ﬁle);

return EXIT_SUCCESS;

}

Note: If we replace export and setenvwith alias, this program can also be used to read a shell independent alias

deﬁnition ﬁle.

6. 2. Network Proﬁle Management

Originally,wehad installed a nifty package called laptop-net, which was supposed to autodetect to which net-

work our machine was connected to and then automagically reconﬁgure the system correspondingly.Unfortu-

nately,this package neverworked as advertised and the package maintainer did not bother to answer emails. We

therefore decided to scrap laptop-net and roll our own replacement.

Similarly as the laptop-net package, we makethe distinction between a network scheme and a network proﬁle.A

scheme describes the network interface and the network connection, whereas a proﬁle describes the system con-

ﬁguration, which is selected for a givenscheme. The advantage of this setup is that we can this way easily map

the same proﬁle to different schemes or different proﬁles to the same scheme.

The different schemes are deﬁned in the network interface description ﬁle /etc/network/interfaces:

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US Robotics USR2410 Manuel d'installation Page 57

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