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Get information about the group with a given ID
#include <sys/types.h>
#include <grp.h>
struct group* getgrgid( gid_t gid );
- gid
- The ID of the group you want to get information about.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The getgrgid() function lets a process gain more knowledge
about group gid. This function uses a static buffer that's
overwritten by each call.
A pointer to an object of type struct group containing an entry
from the group database with a matching gid. On error
or failure to find an entry with a matching gid, a
NULL pointer is returned.
/*
* Print a list of all users in your group
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <grp.h>
int main( void )
{
struct group* g;
char** p;
if( ( g = getgrgid( getgid() ) ) == NULL ) {
fprintf( stderr, "getgrgid: NULL pointer\n" );
return( EXIT_FAILURE );
}
printf( "group name:%s\n", g->gr_name );
for( p = g->gr_mem; *p != NULL; p++ ) {
printf( "\t%s\n", *p );
}
return( EXIT_SUCCESS );
}
POSIX 1003.1
Safety: | |
Cancellation point |
Yes |
Interrupt handler |
No |
Signal handler |
No |
Thread |
No |
getgrent(),
getgrgid_r(),
getgrnam()
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