'\" te .\" Copyright 1989 AT&T. Copyright (c) 2004 Sun Microsystems, Inc. All Rights Reserved. .\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License. .\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License. .\" When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner] .TH GETUTXENT 3C "Nov 21, 2014" .SH NAME getutxent, getutxid, getutxline, pututxline, setutxent, endutxent, utmpxname, getutmp, getutmpx, updwtmp, updwtmpx \- user accounting database functions .SH SYNOPSIS .LP .nf #include \fBstruct utmpx *\fR\fBgetutxent\fR(\fBvoid\fR); .fi .LP .nf \fBstruct utmpx *\fR\fBgetutxid\fR(\fBconst struct utmpx *\fR\fIid\fR); .fi .LP .nf \fBstruct utmpx *\fR\fBgetutxline\fR(\fBconst struct utmpx *\fR\fIline\fR); .fi .LP .nf \fBstruct utmpx *\fR\fBpututxline\fR(\fBconst struct utmpx *\fR\fIutmpx\fR); .fi .LP .nf \fBvoid\fR \fBsetutxent\fR(\fBvoid\fR); .fi .LP .nf \fBvoid\fR \fBendutxent\fR(\fBvoid\fR); .fi .LP .nf \fBint\fR \fButmpxname\fR(\fBconst char *\fR\fIfile\fR); .fi .LP .nf \fBvoid\fR \fBgetutmp\fR(\fBstruct utmpx *\fR\fIutmpx\fR, \fBstruct utmp *\fR\fIutmp\fR); .fi .LP .nf \fBvoid\fR \fBgetutmpx\fR(\fBstruct utmp *\fR\fIutmp\fR, \fBstruct utmpx *\fR\fIutmpx\fR); .fi .LP .nf \fBvoid\fR \fBupdwtmp\fR(\fBchar *\fR\fIwfile\fR, \fBstruct utmp *\fR\fIutmp\fR); .fi .LP .nf \fBvoid\fR \fBupdwtmpx\fR(\fBchar *\fR\fIwfilex\fR, \fBstruct utmpx *\fR\fIutmpx\fR); .fi .SH DESCRIPTION .LP These functions provide access to the user accounting database, \fButmpx\fR (see \fButmpx\fR(4)). Entries in the database are described by the definitions and data structures in \fB\fR\&. .sp .LP The \fButmpx\fR structure contains the following members: .sp .in +2 .nf char ut_user[32]; /* user login name */ char ut_id[4]; /* /etc/inittab id */ /* (usually line #) */ char ut_line[32]; /* device name */ /* (console, lnxx) */ pid_t ut_pid; /* process id */ short ut_type; /* type of entry */ struct exit_status ut_exit; /* exit status of a process */ /* marked as DEAD_PROCESS */ struct timeval ut_tv; /* time entry was made */ int ut_session; /* session ID, used for */ /* windowing */ short ut_syslen; /* significant length of */ /* ut_host */ /* including terminating null */ char ut_host[257]; /* host name, if remote */ .fi .in -2 .sp .LP The \fBexit_status\fR structure includes the following members: .sp .in +2 .nf short e_termination; /* termination status */ short e_exit; /* exit status */ .fi .in -2 .SS "\fBgetutxent()\fR" .LP The \fBgetutxent()\fR function reads in the next entry from a \fButmpx\fR database. If the database is not already open, it opens it. If it reaches the end of the database, it fails. .SS "\fBgetutxid()\fR" .LP The \fBgetutxid()\fR function searches forward from the current point in the \fButmpx\fR database until it finds an entry with a \fBut_type\fR matching \fIid\fR->\fBut_type\fR, if the type specified is \fBRUN_LVL\fR, \fBBOOT_TIME\fR, \fBDOWN_TIME\fR, \fBOLD_TIME\fR, or \fBNEW_TIME\fR. If the type specified in \fIid\fR is \fBINIT_PROCESS\fR, \fBLOGIN_PROCESS\fR, \fBUSER_PROCESS\fR, or \fBDEAD_PROCESS\fR, then \fBgetutxid()\fR will return a pointer to the first entry whose type is one of these four and whose \fBut_id\fR member matches \fIid\fR->\fBut_id\fR. If the end of database is reached without a match, it fails. .SS "\fBgetutxline()\fR" .LP The \fBgetutxline()\fR function searches forward from the current point in the \fButmpx\fR database until it finds an entry of the type \fBLOGIN_PROCESS\fR or \fBUSER_PROCESS\fR which also has a \fIut_line\fR string matching the \fIline\fR->\fBut_line\fR string. If the end of the database is reached without a match, it fails. .SS "\fBpututxline()\fR" .LP The \fBpututxline()\fR function writes the supplied \fButmpx\fR structure into the \fButmpx\fR database. It uses \fBgetutxid()\fR to search forward for the proper place if it finds that it is not already at the proper place. It is expected that normally the user of \fBpututxline()\fR will have searched for the proper entry using one of the \fBgetutx()\fR routines. If so, \fBpututxline()\fR will not search. If \fBpututxline()\fR does not find a matching slot for the new entry, it will add a new entry to the end of the database. It returns a pointer to the \fButmpx\fR structure. When called by a non-root user, \fBpututxline()\fR invokes a \fBsetuid()\fR root program to verify and write the entry, since the \fButmpx\fR database is normally writable only by root. In this event, the \fBut_name\fR member must correspond to the actual user name associated with the process; the \fBut_type\fR member must be either \fBUSER_PROCESS\fR or \fBDEAD_PROCESS\fR; and the \fBut_line\fR member must be a device special file and be writable by the user. .SS "\fBsetutxent()\fR" .LP The \fBsetutxent()\fR function resets the input stream to the beginning. This should be done before each search for a new entry if it is desired that the entire database be examined. .SS "\fBendutxent()\fR" .LP The \fBendutxent()\fR function closes the currently open database. .SS "\fButmpxname()\fR" .LP The \fButmpxname()\fR function allows the user to change the name of the database file examined from \fB/var/adm/utmpx\fR to any other file, most often \fB/var/adm/wtmpx\fR. If the file does not exist, this will not be apparent until the first attempt to reference the file is made. The \fButmpxname()\fR function does not open the file, but closes the old file if it is currently open and saves the new file name. The new file name must end with the "x" character to allow the name of the corresponding \fButmp\fR file to be easily obtainable.; otherwise, an error value of \fB0\fR is returned. The function returns \fB1\fR on success. .SS "\fBgetutmp()\fR" .LP The \fBgetutmp()\fR function copies the information stored in the members of the \fButmpx\fR structure to the corresponding members of the \fButmp\fR structure. If the information in any member of \fButmpx\fR does not fit in the corresponding \fButmp\fR member, the data is silently truncated. (See \fBgetutent\fR(3C) for \fButmp\fR structure) .SS "\fBgetutmpx()\fR" .LP The \fBgetutmpx()\fR function copies the information stored in the members of the \fButmp\fR structure to the corresponding members of the \fButmpx\fR structure. (See \fBgetutent\fR(3C) for \fButmp\fR structure) .SS "\fBupdwtmp()\fR" .LP The \fBupdwtmp()\fR function can be used in two ways. .sp .LP If \fIwfile\fR is \fB/var/adm/wtmp\fR, the \fButmp\fR format record supplied by the caller is converted to a \fButmpx \fRformat record and the \fB/var/adm/wtmpx\fR file is updated (because the \fB/var/adm/wtmp\fR file no longer exists, operations on \fBwtmp\fR are converted to operations on \fBwtmpx\fR by the library functions. .sp .LP If \fIwfile\fR is a file other than \fB/var/adm/wtmp\fR, it is assumed to be an old file in \fButmp\fR format and is updated directly with the \fButmp\fR format record supplied by the caller. .SS "\fBupdwtmpx()\fR" .LP The \fBupdwtmpx()\fR function writes the contents of the \fButmpx\fR structure pointed to by \fIutmpx\fR to the database. .SS "\fButmpx\fR structure" .LP The values of the \fBe_termination\fR and \fBe_exit\fR members of the \fBut_exit\fR structure are valid only for records of type \fBDEAD_PROCESS\fR. For \fButmpx\fR entries created by \fBinit\fR(1M), these values are set according to the result of the \fBwait()\fR call that \fBinit\fR performs on the process when the process exits. See the \fBwait\fR(3C), manual page for the values \fBinit\fR uses. Applications creating \fButmpx\fR entries can set \fBut_exit\fR values using the following code example: .sp .in +2 .nf u->ut_exit.e_termination = WTERMSIG(process->p_exit) u->ut_exit.e_exit = WEXITSTATUS(process->p_exit) .fi .in -2 .sp .LP See \fBwait.h\fR(3HEAD) for descriptions of the \fBWTERMSIG\fR and \fBWEXITSTATUS\fR macros. .sp .LP The \fBut_session\fR member is not acted upon by the operating system. It is used by applications interested in creating \fButmpx\fR entries. .sp .LP For records of type \fBUSER_PROCESS\fR, the \fBnonuserx()\fR macro uses value of the \fBut_exit.e_exit\fR member to mark \fButmpx\fR entries as real logins (as opposed to multiple xterms started by the same user on a window system). This allows the system utilities that display users to obtain an accurate indication of the number of actual users, while still permitting each \fBpty\fR to have a \fButmpx\fR record (as most applications expect). The \fBNONROOT_USRX\fR macro defines the value that \fBlogin\fR places in the \fBut_exit.e_exit\fR member. .SH RETURN VALUES .LP Upon successful completion, \fBgetutxent()\fR, \fBgetutxid()\fR, and \fBgetutxline()\fR each return a pointer to a \fButmpx\fR structure containing a copy of the requested entry in the user accounting database. Otherwise a null pointer is returned. .sp .LP The return value may point to a static area which is overwritten by a subsequent call to \fBgetutxid ()\fR or \fBgetutxline()\fR. .sp .LP Upon successful completion, \fBpututxline()\fR returns a pointer to a \fButmpx\fR structure containing a copy of the entry added to the user accounting database. Otherwise a null pointer is returned. .sp .LP The \fBendutxent()\fR and \fBsetutxent()\fR functions return no value. .sp .LP A null pointer is returned upon failure to read, whether for permissions or having reached the end of file, or upon failure to write. .SH USAGE .LP These functions use buffered standard I/O for input, but \fBpututxline()\fR uses an unbuffered write to avoid race conditions between processes trying to modify the \fButmpx\fR and \fBwtmpx\fR files. .sp .LP Applications should not access the \fButmpx\fR and \fBwtmpx\fR databases directly, but should use these functions to ensure that these databases are maintained consistently. .SH FILES .ne 2 .na \fB\fB/var/adm/utmpx\fR\fR .ad .RS 18n user access and accounting information .RE .sp .ne 2 .na \fB\fB/var/adm/wtmpx\fR\fR .ad .RS 18n history of user access and accounting information .RE .SH ATTRIBUTES .LP See \fBattributes\fR(5) for descriptions of the following attributes: .sp .sp .TS box; c | c l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE _ Interface Stability See below. _ MT-Level Unsafe .TE .sp .LP The \fBendutxent()\fR, \fBgetutxent()\fR, \fBgetutxid()\fR, \fBgetutxline()\fR, \fBpututxline()\fR, and \fBsetutxent()\fR functions are Standard. .SH SEE ALSO .LP \fBgetutent\fR(3C), \fBttyslot\fR(3C), \fBwait\fR(3C), \fBwait.h\fR(3HEAD), \fButmpx\fR(4), \fBattributes\fR(5), \fBstandards\fR(5) .SH NOTES .LP The most current entry is saved in a static structure. Multiple accesses require that it be copied before further accesses are made. On each call to either \fBgetutxid()\fR or \fBgetutxline()\fR, the routine examines the static structure before performing more I/O. If the contents of the static structure match what it is searching for, it looks no further. For this reason, to use \fBgetutxline()\fR to search for multiple occurrences it would be necessary to zero out the static after each success, or \fBgetutxline()\fR would just return the same structure over and over again. There is one exception to the rule about emptying the structure before further reads are done. The implicit read done by \fBpututxline()\fR (if it finds that it is not already at the correct place in the file) will not hurt the contents of the static structure returned by the \fBgetutxent()\fR, \fBgetutxid()\fR, or \fBgetutxline()\fR routines, if the user has just modified those contents and passed the pointer back to \fBpututxline()\fR.