trap通过信号监控进程

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1. 脚本master.sh
   
2. #! /bin/bash
   
3. jk1()
   
4. {
   
5.    echo "child is working !!!!"
   
6.    a=1
   
7.    b=0
   
8. }
   
9. 
   
10. 
    
11. jk2()
    
12. {
    
13.    echo "child is over!!!!!!"
    
14.    b=1
    
15.    a=0
    
16. }
    
17. 
    
18. 
    
19. 
    
20. 
    
21. jk3()
    
22. {
    
23.    echo "child is dead !!!!"
    
24. 
    
25. 
    
26. }
    
27. 
    
28. 
    
29. trap "" 15 16
    
30. trap jk1 15
    
31. trap jk2 16
    
32. 
    
33. 
    
34. echo $a
    
35. #echo "going here 1"
    
36. a=0
    
37. b=0
    
38. 
    
39. 
    
40. main()
    
41. {
    
42. while :
    
43. do
    
44. 
    
45. 
    
46. 
    
47. 
    
48. if [ $a -eq 1 ]
    
49. then
    
50.         child_pid=`pgrep child.sh`
    
51. 
    
52. 
    
53.         if [ -z "${child_pid}" ] && [ $b -ne 1 ]
    
54.         then
    
55.                 jk3
    
56.                 a=2
    
57.                 break
    
58.         fi
    
59. fi
    
60. 
    
61. 
    
62. if [ $a -ne 1 ]
    
63. then
    
64.         child_pid=`pgrep child.sh`
    
65.         if [ "${child_pid}" ]
    
66.         then
    
67.                 jk1
    
68.         fi
    
69. fi
    
70. 
    
71. 
    
72. done
    
73. }
74. 
    
75. while :
    
76. do
    
77. main
    
78. sleep 2
    
79. #echo "going here 2"
    
80. done
81. v

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1. 脚本child.sh
   
2. 
   
3. 
   
4. #! /bin/bash
   
5. master_pid=`pgrep master.sh` && kill -15 $master_pid
   
6. echo $$
   
7. 
   
8. 
   
9. a=1
   
10. 
    
11. 
    
12. while [ $a -ne 20 ]
    
13. do
    
14. sleep 1
    
15. ((a=a+1))
    
16. echo $a
    
17. 
    
18. 
    
19. done
    
20. 
    
21. master_pid=`pgrep master.sh` && kill -16 $master_pid || echo "master is dead , I'm goging over"