Exercise 4.1 Examining Signal Priorities and Execution
How do I test the signals program?
I am not getting the results I expect:
My assumptions: ---------------------------------------------
I compile signals.c (no errors) & run signals exe
./signals
signals program runs & SHOULD (I think) sit waiting for incoming signals
I send to the signals process from another Terminal session using kill -n(thesignal) nnnn(the process)
and the program spits out a display when it gets the signal
---------------------------------------------------------------------------------
However I run ./signals & it displays & terminates:
phil@weeminty ~/Dropbox/LFS201/LABS $ gcc signals.c
phil@weeminty ~/Dropbox/LFS201/LABS $ ./signals
Installing signal handler and Raising signal for signal number:
1 2 3 4 5 6 7 8 -- 10 11 12 13 14 15 16
17 18 -- 20 21 22 23 24 25 26 27 28 29 30 31 -- -- 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
Signal Number(Times Processed)
--------------------------------------------
1: 1 2: 1 3: 1 4: 1 5: 1 6: 1 7: 1 8: 1
9: 0 10: 1 11: 1 12: 1 13: 1 14: 1 15: 1 16: 1
17: 1 18: 0 19: 0 20: 1 21: 1 22: 1 23: 1 24: 1
25: 1 26: 1 27: 1 28: 1 29: 1 30: 1 31: 1 32: 0
33: 0 34: 3 35: 3 36: 3 37: 3 38: 3 39: 3 40: 3
41: 3 42: 3 43: 3 44: 3 45: 3 46: 3 47: 3 48: 3
49: 3 50: 3 51: 3 52: 3 53: 3 54: 3 55: 3 56: 3
57: 3 58: 3 59: 3 60: 3 61: 3 62: 3 63: 3 64: 3
History: Signal Number(Count Processed)
--------------------------------------------
4(1) 5(1) 7(1) 8(1) 11(1) 31(1) 1(1) 2(1)
3(1) 6(1) 10(1) 12(1) 13(1) 14(1) 15(1) 16(1)
17(1) 20(1) 21(1) 22(1) 23(1) 24(1) 25(1) 26(1)
27(1) 28(1) 29(1) 30(1) 34(1) 34(2) 34(3) 35(1)
35(2) 35(3) 36(1) 36(2) 36(3) 37(1) 37(2) 37(3)
38(1) 38(2) 38(3) 39(1) 39(2) 39(3) 40(1) 40(2)
40(3) 41(1) 41(2) 41(3) 42(1) 42(2) 42(3) 43(1)
43(2) 43(3) 44(1) 44(2) 44(3) 45(1) 45(2) 45(3)
46(1) 46(2) 46(3) 47(1) 47(2) 47(3) 48(1) 48(2)
48(3) 49(1) 49(2) 49(3) 50(1) 50(2) 50(3) 51(1)
51(2) 51(3) 52(1) 52(2) 52(3) 53(1) 53(2) 53(3)
54(1) 54(2) 54(3) 55(1) 55(2) 55(3) 56(1) 56(2)
56(3) 57(1) 57(2) 57(3) 58(1) 58(2) 58(3) 59(1)
59(2) 59(3) 60(1) 60(2) 60(3) 61(1) 61(2) 61(3)
62(1) 62(2) 62(3) 63(1) 63(2) 63(3) 64(1) 64(2)
64(3)
phil@weeminty ~/Dropbox/LFS201/LABS $ ps -elf |grep signals
0 S phil 9893 9846 0 80 0 - 3556 pipe_w 10:10 pts/1 00:00:00 grep --color=auto signals
phil@weeminty ~/Dropbox/LFS201/LABS $
I have downloaded the latest version from
https://training.linuxfoundation.org/cm/LFS201/
User LFTraining & pwPenguin2014
with the same result (above).
Tried it as a background process: ./signals &
Tried it using sudo": sudo ./signals
tried gcc signals.c -o mysignals
thus:
phil@weeminty ~/Dropbox/LFS201/LABS $ gcc signals.c -o mysignals
phil@weeminty ~/Dropbox/LFS201/LABS $ l
a.out* mysignals* signals* signals.c was_signals.c
phil@weeminty ~/Dropbox/LFS201/LABS $ ./mysignals
Installing signal handler and Raising signal for signal number:
1 2 3 4 5 6 7 8 -- 10 11 12 13 14 15 16
17 18 -- 20 21 22 23 24 25 26 27 28 29 30 31 -- -- 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
Signal Number(Times Processed)
--------------------------------------------
1: 1 2: 1 3: 1 4: 1 5: 1 6: 1 7: 1 8: 1
9: 0 10: 1 11: 1 12: 1 13: 1 14: 1 15: 1 16: 1
17: 1 18: 0 19: 0 20: 1 21: 1 22: 1 23: 1 24: 1
25: 1 26: 1 27: 1 28: 1 29: 1 30: 1 31: 1 32: 0
33: 0 34: 3 35: 3 36: 3 37: 3 38: 3 39: 3 40: 3
41: 3 42: 3 43: 3 44: 3 45: 3 46: 3 47: 3 48: 3
49: 3 50: 3 51: 3 52: 3 53: 3 54: 3 55: 3 56: 3
57: 3 58: 3 59: 3 60: 3 61: 3 62: 3 63: 3 64: 3
History: Signal Number(Count Processed)
--------------------------------------------
4(1) 5(1) 7(1) 8(1) 11(1) 31(1) 1(1) 2(1)
3(1) 6(1) 10(1) 12(1) 13(1) 14(1) 15(1) 16(1)
17(1) 20(1) 21(1) 22(1) 23(1) 24(1) 25(1) 26(1)
27(1) 28(1) 29(1) 30(1) 34(1) 34(2) 34(3) 35(1)
35(2) 35(3) 36(1) 36(2) 36(3) 37(1) 37(2) 37(3)
38(1) 38(2) 38(3) 39(1) 39(2) 39(3) 40(1) 40(2)
40(3) 41(1) 41(2) 41(3) 42(1) 42(2) 42(3) 43(1)
43(2) 43(3) 44(1) 44(2) 44(3) 45(1) 45(2) 45(3)
46(1) 46(2) 46(3) 47(1) 47(2) 47(3) 48(1) 48(2)
48(3) 49(1) 49(2) 49(3) 50(1) 50(2) 50(3) 51(1)
51(2) 51(3) 52(1) 52(2) 52(3) 53(1) 53(2) 53(3)
54(1) 54(2) 54(3) 55(1) 55(2) 55(3) 56(1) 56(2)
56(3) 57(1) 57(2) 57(3) 58(1) 58(2) 58(3) 59(1)
59(2) 59(3) 60(1) 60(2) 60(3) 61(1) 61(2) 61(3)
62(1) 62(2) 62(3) 63(1) 63(2) 63(3) 64(1) 64(2)
64(3)
phil@weeminty ~/Dropbox/LFS201/LABS $ ps -elf |grep mysignals
0 S phil 10941 9846 0 80 0 - 3556 pipe_w 10:37 pts/1 00:00:00 grep --color=auto mysignals
phil@weeminty ~/Dropbox/LFS201/LABS $
--------------------------------------------------------------------------------------------------
Comments
-
HI:
The excercise is doing exactly what it says it is doing. It is not designed to sit and wait for any user input such as sending a signal to it. It sends a boatload of signals while they are blocked and then unblocks and records what happens. Please read the description after the code source, which says:
Prints out statistics including: – The total number of times each signal was received. – The order in which the signals were received, noting each time the total number of times that signal had been received up to that point.
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