How to create a new unix user in through a c program

Applications Programming
1

Hi ,

I want to create a new user using c program not with unix adduser command .
is it possible to write a cprogram to create a new user account , it should accept username , grouid , group name and all other privilages .

i can use system calls inside c program to do this .

i will execute it in a super user mode .

Many thanks in advance !

Naren

2

I don't think this is a simple "C" program with a couple of system calls.... It sounds like you're on Linux, so try getting a copy of your distro's source for useradd.

3

Hi Jim ,

Thanks for your response .

no i am in HP-uX 11i, my requirement is whether i can write a cprogram to create unix user account .

is it possible !

thanks once again .

Narendra

4

I'm on HPUX as well. Half the time.
Yes it's trivially possible since it's already been done by HP, but I do not know how.

You have a lot of reading and research to do:

Richard Stevens 'Advanced Programming in the UNIX Environment'
Cooper & More 'HP-UX 11i Internals'

What is the reason you can't use existing HP-provided code?

5

Hi Jim ,

Thanks again for your response .

I can use Hp-provided code , but my requirement is that , i should br be able to accept user input from stdin and create a user .

My client wants a mechanisim where he can create users with his login ( if has given the permission of root ) and not by sys admin or root .

anything else let me know !

thanks once again .

Narendra

6

Just use the HP program useradd. Have your C program construct a useradd command line and then use system() to run the command.