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Unix information relevant to Converse.
Used to get the User Information.
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GETUID(2) UNIX Programmer's Manual GETUID(2)
NAME
getuid, geteuid - get user identity
SYNOPSIS
#include <sys/types.h>
uid_t getuid(void);
uid_t geteuid(void);
DESCRIPTION
Getuid returns the real user ID of the current process,
geteuid the effective user ID.
The real user ID identifies the person who is logged in.
The effective user ID gives the process additional permis-
sions during execution of "set-user-ID" mode processes,
which use getuid to determine the real-user-id of the pro-
cess that invoked them.
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GETPWUID(3) UNIX Programmer's Manual GETPWUID(3)
NAME
getpwuid, getpwnam, getpwent, setpwent, endpwent, setpwfile
- user database access
SYNOPSIS
#include <sys/types.h>
#include <pwd.h>
struct passwd *getpwuid(uid_t uid)
struct passwd *getpwnam(const char *name)
(ALSO AVAILABLE IN BSD)
struct passwd *getpwent(void);
void setpwent(void);
void endpwent(void);
void setpwfile(char *name);
DESCRIPTION
The getpwuid and getpwnam functions both return a pointer to
a passwd structure containing an entry from the system's
user (password) database with a matching numeric user ID
(uid) or a user login name (name).
The passwd structure is defined in the header <pwd.h> and
includes the following members:
struct passwd { /* see getpwent(3) */
char *pw_name; /* name (login name, contains no upper case) */
char *pw_passwd; /* encrypted password */
int pw_uid; /* numerical user ID */
int pw_gid; /* numerical group ID */
int pw_quota; /* unused */
char *pw_comment; /* unused */
char *pw_gecos; /* user's real name, office, extension, home phone */
char *pw_dir; /* initial working directory */
char *pw_shell; /* program to use as Shell */
};
Member Type Member Name Description
char * pw_name Login name.
uid_t pw_uid Numerical user ID.
gid_t pw_gid Numerical group ID.
char * pw_dir Pathname of home
directory.
char * pw_shell Initial user (shell)
program.
char * pw_passwd User password. (BSD
only; not POSIX-
compliant)
The passwd structure may contain more implementation-
specific members than those listed here;see passwd(5) for
more information.
The BSD routines setpwent, getpwent, endpwent, and setpwfile
may be used to scan the user database sequentially.
setpwent resets the current user password structure to the
first in the database, getpwent reads and returns the next
user password entry, and endpwent closes the user password
database when processing is complete. In addition,
setpwfile may be called to set the database to that given in
file name, which is a file in passwd(5) format. Setpwfile
doesn't close the previous password file; endpwent should be
used before setpwfile.
NOTES
The value returned points to a static area; if the informa-
tion is to be saved, it must be copied.
RETURN VALUE
A NULL pointer is returned on error or if the requested
entry is not found.
FILES
/etc/passwd - if NetInfo is not running, or if YellowPages
is enabled.
SEE ALSO
getlogin(3), getgrent(3), lookupd(8), netinfo(5), passwd(5)
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GETHOSTNAME(2) UNIX Programmer's Manual GETHOSTNAME(2)
NAME
gethostname, sethostname - get/set name of current host
SYNOPSIS
gethostname(name, namelen)
char *name;
int namelen;
sethostname(name, namelen)
char *name;
int namelen;
DESCRIPTION
Gethostname returns the standard host name for the current
processor, as previously set by sethostname. The parameter
namelen specifies the size of the name array. The returned
name is null-terminated unless insufficient space is pro-
vided.
Sethostname sets the name of the host machine to be name,
which has length namelen. This call is restricted to the
super-user and is normally used only when the system is
bootstrapped.
RETURN VALUE
If the call succeeds a value of 0 is returned. If the call
fails, then a value of -1 is returned and an error code is
placed in the global location errno.
ERRORS
The following errors may be returned by these calls:
[EFAULT] The name or namelen parameter gave an invalid
address.
[EPERM] The caller tried to set the hostname and was
not the super-user.
SEE ALSO
gethostid(2)
BUGS
Host names are limited to MAXHOSTNAMELEN (from
<sys/param.h>) characters, currently 256.
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