CODEWITHSUNDEEP
cprocessoperating-systemposix
schrepfler
schrepfler

Reputation: 107

Can a process have more than one stdout and stdin?

When writing a program (Unix-style), can it address and manage more than one stdout and stdin channels?

Upvotes: 1

Views: 849

Answers (2)

GroovyDotCom
GroovyDotCom

Reputation: 1374

By definition there is only 1 stdin and 1 stdout.

However, you may want to have a look at named pipes. With named pipes you could do something like:

mkfifo pipe1
mkfifo pipe2
cat a.a > pipe1
cat b.b > pipe2
yourapp pipe1 pipe2

Upvotes: 2

Jonathan Leffler
Jonathan Leffler

Reputation: 754760

No; there is (at most) one standard input and one standard output at any given time. Ultimately, since the question specifically mentions Unix, standard input is file descriptor 0 and standard output is file descriptor 1, and there is only one file descriptor with a given number.

Upvotes: 5

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