set_ids_from_arg()

Updated: October 26, 2022

Change the caller's identifiers, based on a given string

Synopsis:

#include <login.h>

int set_ids_from_arg( const char *string );

Arguments:

string
The formatted string containing the information about the IDs to set; see below.

Library:

liblogin

Use the -l login option to qcc to link against this library.

Description:

The set_ids_from_arg() function changes the caller's user ID, group ID, and supplementary group IDs, based on the given string. The string can be in one of the following forms:

uid[:gid[,sup_gid]*]
All IDs must be numbers. The user ID and the group ID are separated by a colon, and can be followed by an arbitrary number of supplementary group IDs separated by commas. The user ID is mandatory; we recommend that you also specify the group ID.
user_name[,sup_gid]*
This form depends on the /etc/passwd and /etc/group files, so that set_ids_from_arg() can determine the user ID and the group ID from the user_name. The name can be followed by an arbitrary number of numeric supplementary group IDs separated by commas.

Returns:

0 on success, or -1 if an error occurred (errno is set).

Classification:

QNX Neutrino

Safety:  
Cancellation point Yes
Interrupt handler No
Signal handler No
Thread No