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Full Discussion: Help with getuid
Top Forums Programming Help with getuid Post 302893897 by Corona688 on Friday 21st of March 2014 02:06:53 PM
Old 03-21-2014
"Has errors" is not really a useful thing to say. What errors it had would've been much more helpful. If you'd posted those errors, someone else could tell I'd misspelled some function names -- not to mention some other errors in my code, which was written in a real hurry. Sorry about that, this one actually compiles:

Try this:
Code:
#include <sys/types.h>
#include <pwd.h>
#include <stdio.h>

int main(void) {
        const char *user="user";
        struct passwd *p=getpwnam(user);

        if(p != NULL)
                printf("name %s UID %d GID %d\n", user, (int)p->pw_name, p->pw_uid, (int)p->pw_gid);
        else fprintf(stderr, "No such user '%s'\n", user);
}

Last edited by Corona688; 03-21-2014 at 03:21 PM..
This User Gave Thanks to Corona688 For This Post:
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LEARN ABOUT REDHAT

getpwuid

GETPWNAM(3)						     Linux Programmer's Manual						       GETPWNAM(3)

NAME

       getpwnam, getpwuid - get password file entry

SYNOPSIS

       #include <pwd.h>
       #include <sys/types.h>

       struct passwd *getpwnam(const char *name);

       struct passwd *getpwuid(uid_t uid);

DESCRIPTION

       The  getpwnam()	function  returns  a pointer to a structure containing the broken out fields of a line from /etc/passwd for the entry that
       matches the user name name.

       The getpwuid() function returns a pointer to a structure containing the broken out fields of a line from /etc/passwd  for  the  entry  that
       matches the user uid uid.

       The passwd structure is defined in <pwd.h> as follows:

	      struct passwd {
		      char    *pw_name;       /* user name */
		      char    *pw_passwd;     /* user password */
		      uid_t   pw_uid;	      /* user id */
		      gid_t   pw_gid;	      /* group id */
		      char    *pw_gecos;      /* real name */
		      char    *pw_dir;	      /* home directory */
		      char    *pw_shell;      /* shell program */
	      };

RETURN VALUE

       The  getpwnam()	and  getpwuid() functions return a pointer to the passwd structure, or NULL if the matching entry is not found or an error
       occurs.

ERRORS

       ENOMEM Insufficient memory to allocate passwd structure.

FILES

       /etc/passwd
	      password database file

CONFORMING TO

       SVID 3, POSIX, BSD 4.3

SEE ALSO

       fgetpwent(3), getgrnam(3), getpwent(3), setpwent(3), endpwent(3), getpw(3), putpwent(3), passwd(5)

GNU
								    1996-05-27							       GETPWNAM(3)
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