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Get information about the user with a given ID
#include <sys/types.h>
#include <pwd.h>
struct passwd* getpwuid( uid_t uid );
- uid
- The userid whose entry you want to find.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The getpwuid() function gets information
about user uid. This function uses a static buffer that's
overwritten by each call.
A pointer to an object of type struct passwd
containing an entry from the group database with a matching uid,
or NULL if an error occurred or the function couldn't find a
matching entry.
/*
* Print password info on the current user.
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <pwd.h>
int main( void )
{
struct passwd* pw;
if( ( pw = getpwuid( getuid() ) ) == NULL ) {
fprintf( stderr,
"getpwuid: no password entry\n" );
return( EXIT_FAILURE );
}
printf( "login name %s\n", pw->pw_name );
printf( "user id %d\n", pw->pw_uid );
printf( "group id %d\n", pw->pw_gid );
printf( "home dir %s\n", pw->pw_dir );
printf( "login shell %s\n", pw->pw_shell );
return( EXIT_SUCCESS );
}
POSIX 1003.1
Safety: | |
Cancellation point |
Yes |
Interrupt handler |
No |
Signal handler |
No |
Thread |
No |
getlogin(),
getpwent(),
getpwent_r(),
getpwnam()
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