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    The following form allows you to view linux man pages.

    Command:

    shadow

    
    
    

    SYNTAX

           #include <shadow.h>
    
           struct spwd *getspent();
    
           struct spwd *getspnam(char *name);
    
           void setspent();
    
           void endspent();
    
           struct spwd *fgetspent(FILE *fp);
    
           struct spwd *sgetspent(char *cp);
    
           int putspent(struct spwd *p, FILE *fp);
    
           int lckpwdf();
    
           int ulckpwdf();
    
    
    

    DESCRIPTION

           shadow manipulates the contents of the shadow password file,
           /etc/shadow. The structure in the #include file is:
    
               struct spwd {
                     char          *sp_namp; /* user login name */
                     char          *sp_pwdp; /* encrypted password */
                     long int      sp_lstchg; /* last password change */
                     long int      sp_min; /* days until change allowed. */
                     long int      sp_max; /* days before change required */
                     long int      sp_warn; /* days warning for expiration */
                     long int      sp_inact; /* days before account inactive */
                     long int      sp_expire; /* date when account expires */
                     unsigned long int  sp_flag; /* reserved for future use */
               }
    
           The meanings of each field are:
    
           ?   sp_namp - pointer to null-terminated user name
    
           ?   sp_pwdp - pointer to null-terminated password
    
           ?   sp_flag - reserved for future use
    
    
    

    DESCRIPTION

           getspent, getspname, fgetspent, and sgetspent each return a pointer to
           a struct spwd.  getspent returns the next entry from the file, and
           fgetspent returns the next entry from the given stream, which is
           assumed to be a file of the proper format.  sgetspent returns a pointer
           to a struct spwd using the provided string as input.  getspnam searches
           from the current position in the file for an entry matching name.
    
           setspent and endspent may be used to begin and end, respectively,
           access to the shadow password file.
    
           The lckpwdf and ulckpwdf routines should be used to insure exclusive
           access to the /etc/shadow file.  lckpwdf attempts to acquire a lock
           using pw_lock for up to 15 seconds. It continues by attempting to
           acquire a second lock using spw_lock for the remainder of the initial
           15 seconds. Should either attempt fail after a total of 15 seconds,
           lckpwdf returns -1. When both locks are acquired 0 is returned.
    
    
    

    DIAGNOSTICS

           Routines return NULL if no more entries are available or if an error
           occurs during processing. Routines which have int as the return value
           return 0 for success and -1 for failure.
    
    
    

    CAVEATS

           These routines may only be used by the superuser as access to the
           shadow password file is restricted.
    
    
    

    FILES

           /etc/shadow
               Secure user account information.
    
    
    

    SEE ALSO

           getpwent(3), shadow(5).
    
    
    

    Library Calls 07/24/2009 SHADOW(3)

    
    
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