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utmp.h
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/* The `struct utmp' type, describing entries in the utmp file. Copyright (C) 1993-2019 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #ifndef _UTMP_H # error "Never include <bits/utmp.h> directly; use <utmp.h> instead." #endif #include <paths.h> #include <sys/time.h> #include <sys/types.h> #include <bits/wordsize.h> #define UT_LINESIZE 32 #define UT_NAMESIZE 32 #define UT_HOSTSIZE 256 /* The structure describing an entry in the database of previous logins. */ struct lastlog { #if __WORDSIZE_TIME64_COMPAT32 int32_t ll_time; #else __time_t ll_time; #endif char ll_line[UT_LINESIZE]; char ll_host[UT_HOSTSIZE]; }; /* The structure describing the status of a terminated process. This type is used in `struct utmp' below. */ struct exit_status { short int e_termination; /* Process termination status. */ short int e_exit; /* Process exit status. */ }; /* The structure describing an entry in the user accounting database. */ struct utmp { short int ut_type; /* Type of login. */ pid_t ut_pid; /* Process ID of login process. */ char ut_line[UT_LINESIZE] __attribute_nonstring__; /* Devicename. */ char ut_id[4] __attribute_nonstring__; /* Inittab ID. */ char ut_user[UT_NAMESIZE] __attribute_nonstring__; /* Username. */ char ut_host[UT_HOSTSIZE] __attribute_nonstring__; /* Hostname for remote login. */ struct exit_status ut_exit; /* Exit status of a process marked as DEAD_PROCESS. */ /* The ut_session and ut_tv fields must be the same size when compiled 32- and 64-bit. This allows data files and shared memory to be shared between 32- and 64-bit applications. */ #if __WORDSIZE_TIME64_COMPAT32 int32_t ut_session; /* Session ID, used for windowing. */ struct { int32_t tv_sec; /* Seconds. */ int32_t tv_usec; /* Microseconds. */ } ut_tv; /* Time entry was made. */ #else long int ut_session; /* Session ID, used for windowing. */ struct timeval ut_tv; /* Time entry was made. */ #endif int32_t ut_addr_v6[4]; /* Internet address of remote host. */ char __glibc_reserved[20]; /* Reserved for future use. */ }; /* Backwards compatibility hacks. */ #define ut_name ut_user #ifndef _NO_UT_TIME /* We have a problem here: `ut_time' is also used otherwise. Define _NO_UT_TIME if the compiler complains. */ # define ut_time ut_tv.tv_sec #endif #define ut_xtime ut_tv.tv_sec #define ut_addr ut_addr_v6[0] /* Values for the `ut_type' field of a `struct utmp'. */ #define EMPTY 0 /* No valid user accounting information. */ #define RUN_LVL 1 /* The system's runlevel. */ #define BOOT_TIME 2 /* Time of system boot. */ #define NEW_TIME 3 /* Time after system clock changed. */ #define OLD_TIME 4 /* Time when system clock changed. */ #define INIT_PROCESS 5 /* Process spawned by the init process. */ #define LOGIN_PROCESS 6 /* Session leader of a logged in user. */ #define USER_PROCESS 7 /* Normal process. */ #define DEAD_PROCESS 8 /* Terminated process. */ #define ACCOUNTING 9 /* Old Linux name for the EMPTY type. */ #define UT_UNKNOWN EMPTY /* Tell the user that we have a modern system with UT_HOST, UT_PID, UT_TYPE, UT_ID and UT_TV fields. */ #define _HAVE_UT_TYPE 1 #define _HAVE_UT_PID 1 #define _HAVE_UT_ID 1 #define _HAVE_UT_TV 1 #define _HAVE_UT_HOST 1