Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

ualarm(3) [osx man page]

UALARM(3)						   BSD Library Functions Manual 						 UALARM(3)

NAME
ualarm -- schedule signal after specified time LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <unistd.h> useconds_t ualarm(useconds_t useconds, useconds_t interval); DESCRIPTION
This is a simplified interface to setitimer(2). The ualarm() function waits a count of useconds before asserting the terminating signal SIGALRM. System activity or time used in processing the call may cause a slight delay. If the interval argument is non-zero, the SIGALRM signal will be sent to the process every interval microseconds after the timer expires (e.g., after useconds number of microseconds have passed). Due to a setitimer(2) restriction, the maximum number of useconds and interval is limited to 100,000,000,000,000 (in case this value fits in the unsigned integer). RETURN VALUES
When the signal has successfully been caught, ualarm() returns the amount of time left on the clock. NOTES
A microsecond is 0.000001 seconds. SEE ALSO
getitimer(2), setitimer(2), sigpause(2), sigvec(2), alarm(3), signal(3), sleep(3), usleep(3) HISTORY
The ualarm() function appeared in 4.3BSD. BSD
April 19, 1994 BSD

Check Out this Related Man Page

UALARM(3)						   BSD Library Functions Manual 						 UALARM(3)

NAME
ualarm -- schedule signal after specified time LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <unistd.h> useconds_t ualarm(useconds_t microseconds, useconds_t interval); DESCRIPTION
This is a simplified interface to setitimer(2). The ualarm() function waits a count of microseconds before asserting the terminating signal SIGALRM. System activity or time used in pro- cessing the call may cause a slight delay. If the interval argument is non-zero, the SIGALRM signal will be sent to the process every interval microseconds after the timer expires (e.g. after microseconds number of microseconds have passed). Due to setitimer(2) restriction the maximum number of microseconds and interval is limited to 100000000000000 (in case this value fits in the unsigned integer). RETURN VALUES
When the signal has successfully been caught, ualarm() returns the amount of time left on the clock. NOTES
A microsecond is 0.000001 seconds. SEE ALSO
getitimer(2), setitimer(2), sigaction(2), sigsuspend(2), alarm(3), signal(3), sleep(3), usleep(3) HISTORY
The ualarm() function appeared in 4.3BSD. BSD
April 19, 1994 BSD
Man Page

14 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

sort data

Hi! I'm trying to sort a file.dat with the sort command. The data contained by file.dat is similar to the data set below: 100.000 99.000 110.000 55.000 113.000 33.000 25.000 9.000 15.000 It is relatively easy to sort the data in ascending or descending order, but the problem is... (11 Replies)
Discussion started by: bjorb
11 Replies

2. UNIX for Advanced & Expert Users

Grep Line with Matching Fields

Below is the scenario. Help is appreciated. File1: ( 500,000 lines ) : Three fields comma delimited : Not sorted 1234FAA,435612,88975 1224FAB,12345,212356 File2: ( 4,000,000 lines ) : Six fields comma delimited (Last 3 field should match the 3 fields of File1) : Not Sorted : ... (13 Replies)
Discussion started by: hemangjani
13 Replies

3. Programming

Runaway SIGALRM signal handler

I have written a program to demonstrate a problem I have encountered when using BSD style asynchronous input using the O_ASYNC flag in conjunction with a real time interval timer sending regular SIGALRM signals to the program. The SIGIO handler obeys all safe practices, using only an atomic update... (8 Replies)
Discussion started by: stewartw
8 Replies

4. Shell Programming and Scripting

column to row convert - script - help

Hi, I have a file named col.txt 1.000 2.000 3.000 4.000 5.000 6.000 7.000 8.000 I should get this 1.000 5.000 2.000 6.000 3.000 7.000 (10 Replies)
Discussion started by: G0Y
10 Replies

5. Shell Programming and Scripting

appending column file

Hi all, I have two files with the same number of lines the first file is a.dat and looks like 0.000 1.000 1.000 2.000 ... the fields are tab separated the second file is b.dat and looks like 1.2347 0.546 2.3564 0.321 ... the fields are tab separated I would like to have a file c.dat... (4 Replies)
Discussion started by: f_o_555
4 Replies

6. AIX

Question about 223

Can somebody tell me, what is the difference between the certifications 000-222 and 000-223??? (6 Replies)
Discussion started by: gsabarinath
6 Replies

7. Shell Programming and Scripting

Removing file lines that each match to a different patterns

I have a very large file (10,000,000 lines), that contains a sample id and a property of that sample. I have another file that contains around 1,000,000 lines with sample ids that I want to remove from the original file (create a new file without these lines). I know how to do this in Perl, but it... (9 Replies)
Discussion started by: Jo_puzzled
9 Replies

8. Programming

Jumping to a particular line in a file

Hi, I have an output file which has more than 1,000,000,000 lines. I am accessing this file in another C++ program. Now while accessing the output file using cin, I want to jump, say, to the 5,000,000th line directly and start accessing data from there. Is this possible? Could someone please... (4 Replies)
Discussion started by: mugga
4 Replies

9. Shell Programming and Scripting

Slow performance filtering file

Please, I need help tuning my script. It works but it's too slow. The code reads an acivity log file with 50.000 - 100.000 lines and filters error messages from it. The data in the actlog file look similar to this: 02/08/2011 00:25:01,ANR2034E QUERY MOUNT: No match found using this criteria.... (5 Replies)
Discussion started by: Miila
5 Replies

10. What is on Your Mind?

Congratulations Neo for 10,000 Post

Hi all, Please join me to congrats Neo for crossing 10,000 posts count. I think he is the first to have this count with the longest journey (12 yrs) at unix.com. At least I didn't see any other member with the same or more figures.Mods, please correct me if wrong. Perderabo is likely to be the... (6 Replies)
Discussion started by: clx
6 Replies

11. Shell Programming and Scripting

Adding columns of time

Hello all, I'm in the process of writing a script, and I need to be able to add columns of time in the following format (time elapsed Net Backup logs): 000:01:03 000:00:58 000:00:49 Does anyone have a way of converting and/or adding timestamps such as these accurately? Thanks in... (9 Replies)
Discussion started by: LinuxRacr
9 Replies

12. UNIX for Dummies Questions & Answers

Swapping column in vi editor

is there any command in vi editor to turn this 986.000 4.026.000 775.328.625 9.319.003.000 986.000 4.036.000 775.328.625 9.318.803.000 986.000 4.046.000 775.328.625 9.318.603.000 986.000 4.056.000 775.328.625 9.318.403.000 become this... (5 Replies)
Discussion started by: muhnandap
5 Replies

13. Shell Programming and Scripting

Echo printing a line in 2 lines; expected to print in one line

Dear All, fileName: therm.txt nc3h7o2h 7/27/98 thermc 3h 8o 2 0g 300.000 5000.000 1390.000 41 1.47017550e+01 1.71731699e-02-5.91205329e-06 9.21842570e-10-5.36438880e-14 2 -2.99988556e+04-4.93387892e+01 2.34710908e+00 4.34517484e-02-2.65357553e-05 3 ... (7 Replies)
Discussion started by: linuxUser_
7 Replies

14. UNIX for Beginners Questions & Answers

Replace string2 with string3 on all lines starting with string1

My OS is Windows 10 and I am using Cygwin. The file 1 content is: USE solution 2; -4.000 USE solution 3; -4.000 … USE solution 29; -4.000 USE solution 30; -4.000 USE solution 31; -4.000 …. USE solution 89; -4.000 ... USE solution 202; -4.000 etc... I need to replace... (8 Replies)
Discussion started by: supernono06
8 Replies