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All of the communications between Asterisk and the AGI program happen over STDIN and STDOUT (and, of course, STDERR)
Posted by adalson007
STDIN , STDOUT , and STDERR are channels by which programs in Unix-like environments receive information from and send information to external programs. STDIN, or standard input, is the information that is sent to the program, either from the keyboard or from another program. In our case, information coming from Asterisk itself comes in on the program's STDIN file handle. STDOUT, or standard output, is the file handle that the AGI script uses to pass information back to Asterisk. Finally, the AGI script can use the STDERR (standard error) file handle to write error messages to the Asterisk console.
Posted by james_winston
What Are STDIN, STDOUT, and STDERR?
STDIN , STDOUT , and STDERR are channels by which programs in Unix-like environments
receive information from and send information to external programs. STDIN, or
standard input, is the information that is sent to the program, either from the keyboard
or from another program. In our case, information coming from Asterisk itself comes
in on the program’s STDIN file handle. STDOUT, or standard output, is the file handle that
the AGI script uses to pass information back to Asterisk. Finally, the AGI script can
use the STDERR (standard error) file handle to write error messages to the Asterisk
console.
Let’s sum up these three communications concepts:
• An AGI script reads from STDIN to get information from Asterisk.
• An AGI script writes data to STDOUT to send information to Asterisk.
• An AGI script may write data to STDERR to send debug information to the Asterisk
console.
Posted by sagitraz
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