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Annotation of coherent/d/etc/SYSVcron/src/pwfun.c, revision 1.1

1.1     ! root        1: /* 
        !             2:  * The example shows the usage of getuid(), geteuid() COHERENT SYstem calls
        !             3:  * and getpwnam, getpwuid, setpwent, getpwent, and endpwent functions.
        !             4:  */
        !             5: #include       <pwd.h>
        !             6: #include       <stdio.h>
        !             7: 
        !             8: main()
        !             9: {
        !            10:        int             euid,           /* Effective user id */
        !            11:                        ruid;           /* Real user id */
        !            12:        struct passwd   *pstp;  
        !            13:        int             i;
        !            14: 
        !            15:        /* Print out all users and  home directories */
        !            16:        i = 0;
        !            17:        setpwent();     /* Rewind file /etc/passwd */
        !            18:        while ((pstp = getpwent()) != NULL) 
        !            19:                printf("%d: user name is %s, home directory is %s.\n",
        !            20:                                        ++i, pstp->pw_name, pstp->pw_dir);
        !            21: 
        !            22:        /* Find real user name. 
        !            23:         *
        !            24:         * NOTE: functions getpwuid and getpwnam will rewind /etc/passwd file
        !            25:         * by calling setpwent.
        !            26:         */
        !            27:        ruid = getuid();
        !            28:        if ((pstp = getpwuid(ruid)) == NULL) 
        !            29: /* If this message come out too bad. Possible file /etc/passwd corrupted. */
        !            30:                fprintf(stderr, "Cannot find user with id number %d\n", pstp);
        !            31:        else
        !            32:                printf("Real user name is %s\n", pstp->pw_name);
        !            33: 
        !            34:        /* Find the user id for superuser root */
        !            35:        ((pstp = getpwnam("root")) == NULL) ?
        !            36:                fprintf(stderr, "Do you have user root on your system?\n") :
        !            37:                printf("root id is  %d\n", pstp->pw_uid);
        !            38: 
        !            39:        /* Check is the effective process id is the superuser id *
        !            40:         * 
        !            41:         * NOTE: if you would like to see how to enable root prileges,
        !            42:         * you can run next command from command line:
        !            43:         * cc pwfun.c
        !            44:         * su root chown root pwfun
        !            45:         * su root chmod 4511 pwfun
        !            46:         */
        !            47:        euid = geteuid();
        !            48:        printf("%d %d\n", ruid, euid);
        !            49:        printf("Process ");
        !            50:        (euid == pstp->pw_uid) ? printf("has ") : printf("doesn't have ");
        !            51:        printf("the root priveleges\n");
        !            52: }

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