NAME

getlogin − get login name

SYNOPSIS

char ∗getlogin ( );

DESCRIPTION

Getlogin returns a pointer to the login name as found in /etc/utmp.  It may be used in conjunction with getpwnam to locate the correct password file entry when the same user ID is shared by several login names. 

If getlogin is called within a process that is not attached to a terminal, it returns a NULL pointer.  The recommended procedure to obtain the user name associated with the real user ID of the calling process is to call getlogin , and if that fails to call getpwuid. The function cuserid may be used to obtain the user name associated with the effective user ID of the calling process. 

ERRORS

Getlogin will fail if any of the following is true:

[EBADF] An invalid file descriptor was obtained. 

[EMFILE] Too many file descriptors are in use by this process. 

[ENFILE] The system file table is full. 

FILES

/etc/utmp

SEE ALSO

getgrent(3C), getpwent(3C), cuserid(3S), utmp(4). 

DIAGNOSTICS

Getlogin returns the NULL pointer if name is not found. 

WARNINGS

The return values point to static data whose content is overwritten by each call. 

STANDARDS CONFORMANCE

getlogin: SVID2, XPG2, XPG3, POSIX.1, FIPS 151-1

Hewlett-Packard Company  —  HP-UX Release 7.0: Sept 1989