HP 800 ACSE/Presentation and ROSE Interface Programmer's Guide - Page 37

Request the Association

Get HP 800 PDF manuals and user guides View all HP 800 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 37 highlights

Figure 3-5 Using ACSE/Presentation Step 2: Establish an Association Process A calls ap_set_env() using the AP_CNTX_NAME attribute to identify the application context name. Process A then calls ap_set_env() using the AP_PCDL attribute to propose transfer syntaxes for each proposed abstract syntax that will be used for data transfer between Process A and B. Establish Data Transfer Environment Process A AP Environment A ap_set_env() AP_REM_PADDR, b_p_sel, b_s_sel, b_t_sel, b_nsap AP_CNTX_NAME,a_cntx AP_PCDL,a_pcdl ap_set_env() ap_set_env() Process B AP Environment B Initiator Communication Endpoint A Responder Communication Endpoint B Request the Association Process ap_snd() uses the A_ASSOC_REQ primitive and includes the application context name, presentation context definition list (PCDL), and Process B's presentation address. Process B uses ap_poll() to listen for the association request. (See Figure 3-6.) This can be used to limit the time Process B can wait for an association request. Chapter 3 37

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 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
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
Chapter 3
37
Using ACSE/Presentation
Step 2: Establish an Association
Process A calls ap_set_env() using the AP_CNTX_NAME attribute to
identify the application context name. Process A then calls ap_set_env()
using the AP_PCDL attribute to propose transfer syntaxes for each
proposed abstract syntax that will be used for data transfer between
Process A and B.
Figure 3-5
Establish Data Transfer Environment
Request the Association
Process ap_snd() uses the A_ASSOC_REQ primitive and includes the
application context name, presentation context deļ¬nition list (PCDL),
and Process B's presentation address. Process B uses ap_poll() to listen
for the association request. (See Figure 3-6.)
This can be used to limit the time Process B can wait for an association
request.
Communication
Communication
Endpoint A
Endpoint B
Process A
Process B
AP Environment A
AP Environment B
ap_set_env()
ap_set_env()
ap_set_env()
AP_REM_PADDR,
b_p_sel,
b_s_sel,
b_t_sel,
b_nsap
AP_CNTX_NAME,a_cntx
AP_PCDL,a_pcdl
Initiator
Responder