zhyfer
Reputation: 920
c - check for when nothing is piped to stdin
Basically I'm trying to check if anything is in stdin when the program is called, so if I've got another file called output that writes to stdout then
./output | ./program should work and ./program should exit with an error
Upvotes: 4
Views: 560
Answers (2)
user611775
Reputation: 1353
isatty checks for a tty, not a pipe. Use fstat(STDIN_FILENO, &sb) instead and check for S_ISFIFO(sb.st_mode).
To check whether there is anything "in" stdin that you could possibly read, you use, for example poll(2) with an event mask of POLLIN.
Upvotes: 3
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