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Added text on biarch details for ut_session and ut_tv

This commit is contained in:
Michael Kerrisk 2005-09-15 13:36:44 +00:00
parent e3535a4396
commit f39e2bca7f
1 changed files with 68 additions and 27 deletions
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95
man5/utmp.5
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@ -52,39 +52,53 @@ around; details depend on the version of libc):
.nf .nf
.sp .sp
.ta 3i .ta 3i
#define UT_UNKNOWN 0 #define UT_UNKNOWN 0
#define RUN_LVL 1 #define RUN_LVL 1
#define BOOT_TIME 2 #define BOOT_TIME 2
#define NEW_TIME 3 #define NEW_TIME 3
#define OLD_TIME 4 #define OLD_TIME 4
#define INIT_PROCESS 5 #define INIT_PROCESS 5
#define LOGIN_PROCESS 6 #define LOGIN_PROCESS 6
#define USER_PROCESS 7 #define USER_PROCESS 7
#define DEAD_PROCESS 8 #define DEAD_PROCESS 8
#define ACCOUNTING 9 #define ACCOUNTING 9
#define UT_LINESIZE 12 #define UT_LINESIZE 12
#define UT_NAMESIZE 32 #define UT_NAMESIZE 32
#define UT_HOSTSIZE 256 #define UT_HOSTSIZE 256
struct exit_status { struct exit_status {
short int e_termination; /* process termination status. */ short int e_termination; /* process termination status */
short int e_exit; /* process exit status. */ short int e_exit; /* process exit status */
}; };
struct utmp { struct utmp {
short ut_type; /* type of login */ short ut_type; /* type of login */
pid_t ut_pid; /* PID of login process */ pid_t ut_pid; /* PID of login process */
char ut_line[UT_LINESIZE]; /* device name of tty \- "/dev/" */ char ut_line[UT_LINESIZE]; /* device name of tty \- "/dev/" */
char ut_id[4]; /* init id or abbrev. ttyname */ char ut_id[4]; /* init id or abbrev. ttyname */
char ut_user[UT_NAMESIZE]; /* user name */ char ut_user[UT_NAMESIZE]; /* user name */
char ut_host[UT_HOSTSIZE]; /* hostname for remote login */ char ut_host[UT_HOSTSIZE]; /* hostname for remote login */
struct exit_status ut_exit; /* The exit status of a process struct exit_status ut_exit; /* The exit status of a process
marked as DEAD_PROCESS. */ marked as DEAD_PROCESS */
long ut_session; /* session ID, used for windowing*/
struct timeval ut_tv; /* time entry was made. */ /* The ut_session and ut_tv fields must be the same size when
int32_t ut_addr_v6[4]; /* IP address of remote host. */ compiled 32- and 64-bit. This allows data files and shared
char __unused[20]; /* Reserved for future use. */ memory to be shared between 32- and 64-bit applications */
#if __WORDSIZE == 64 && defined __WORDSIZE_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]; /* IP address of remote host */
char __unused[20]; /* Reserved for future use */
}; };
/* Backwards compatibility hacks. */ /* Backwards compatibility hacks. */
@ -176,6 +190,33 @@ and some versions of
.BR getty (1). .BR getty (1).
Neither of these programs creates the file, so if it is Neither of these programs creates the file, so if it is
removed, record-keeping is turned off. removed, record-keeping is turned off.
.PP
Note that on \fBbiarch\fP platforms, i.e. systems which can run both
32-bit and 64-bit applications (x86-64, ppc64, s390x, etc.),
\fIut_tv\fP is the same size in 32-bit mode as in 64-bit mode.
The same goes for \fIut_session\fP and \fIut_time\fP if they are present.
This allows data files and shared memory to be shared between
32-bit and 64-bit applications.
.\" FIXEME -- maybe include the following (MTK, 15 Sep 2005)
.\" The following example is the recommended
.\" method for filling in the \fIut_tv\fP member:
.\" .RS
.\" .nf
.\" .sp
.\" .ta 3i
.\" struct utmp ut;
.\" ...
.\" if (sizeof (ut.ut_tv) == sizeof (struct timeval))
.\" gettimeofday((struct timeval *) &ut.ut_tv, NULL);
.\" else {
.\" struct timeval tv;
.\" gettimeofday(&tv, NULL);
.\" ut.ut_tv.tv_sec = tv.tv_sec;
.\" ut.ut_tv.tv_usec = tv.tv_usec;
.\" }
.\" .SP
.\" .fi
.\" .RE
.SH FILES .SH FILES
/var/run/utmp /var/run/utmp
.br .br