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-'\" t
-.\" Copyright (c) 2003 Andries Brouwer (aeb@cwi.nl)
-.\"
-.\" SPDX-License-Identifier: GPL-2.0-or-later
-.\"
-.TH ualarm 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-ualarm \- schedule signal after given number of microseconds
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B "#include <unistd.h>"
-.P
-.BI "useconds_t ualarm(useconds_t " usecs ", useconds_t " interval );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR ualarm ():
-.nf
-    Since glibc 2.12:
-        (_XOPEN_SOURCE >= 500) && ! (_POSIX_C_SOURCE >= 200809L)
-            || /* glibc >= 2.19: */ _DEFAULT_SOURCE
-            || /* glibc <= 2.19: */ _BSD_SOURCE
-    Before glibc 2.12:
-        _BSD_SOURCE || _XOPEN_SOURCE >= 500
-.\"    || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
-.fi
-.SH DESCRIPTION
-The
-.BR ualarm ()
-function causes the signal
-.B SIGALRM
-to be sent to the invoking process after (not less than)
-.I usecs
-microseconds.
-The delay may be lengthened slightly by any system activity
-or by the time spent processing the call or by the
-granularity of system timers.
-.P
-Unless caught or ignored, the
-.B SIGALRM
-signal will terminate the process.
-.P
-If the
-.I interval
-argument is nonzero, further
-.B SIGALRM
-signals will be sent every
-.I interval
-microseconds after the first.
-.SH RETURN VALUE
-This function returns the number of microseconds remaining for
-any alarm that was previously set, or 0 if no alarm was pending.
-.SH ERRORS
-.TP
-.B EINTR
-Interrupted by a signal; see
-.BR signal (7).
-.TP
-.B EINVAL
-\fIusecs\fP or \fIinterval\fP is not smaller than 1000000.
-(On systems where that is considered an error.)
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR ualarm ()
-T}	Thread safety	MT-Safe
-.TE
-.SH STANDARDS
-None.
-.SH HISTORY
-4.3BSD, POSIX.1-2001.
-POSIX.1-2001 marks it as obsolete.
-Removed in POSIX.1-2008.
-.P
-4.3BSD, SUSv2, and POSIX do not define any errors.
-.P
-POSIX.1-2001 does not specify what happens if the
-.I usecs
-argument is 0.
-.\" This case is not documented in HP-US, Solar, FreeBSD, NetBSD, or OpenBSD!
-On Linux (and probably most other systems),
-the effect is to cancel any pending alarm.
-.P
-The type
-.I useconds_t
-is an unsigned integer type capable of holding integers
-in the range [0,1000000].
-On the original BSD implementation, and in glibc before glibc 2.1,
-the arguments to
-.BR ualarm ()
-were instead typed as
-.IR "unsigned int" .
-Programs will be more portable if they never mention
-.I useconds_t
-explicitly.
-.P
-The interaction of this function with
-other timer functions such as
-.BR alarm (2),
-.BR sleep (3),
-.BR nanosleep (2),
-.BR setitimer (2),
-.BR timer_create (2),
-.BR timer_delete (2),
-.BR timer_getoverrun (2),
-.BR timer_gettime (2),
-.BR timer_settime (2),
-.BR usleep (3)
-is unspecified.
-.P
-This function is obsolete.
-Use
-.BR setitimer (2)
-or POSIX interval timers
-.RB ( timer_create (2),
-etc.)
-instead.
-.SH SEE ALSO
-.BR alarm (2),
-.BR getitimer (2),
-.BR nanosleep (2),
-.BR select (2),
-.BR setitimer (2),
-.BR usleep (3),
-.BR time (7)