isatty (3)
NAME
isatty - test whether a file descriptor refers to a terminalSYNOPSIS
#include <unistd.h> int isatty(int fd);
DESCRIPTION
The isatty() function tests whether fd is an open file descriptor referring to a terminal.RETURN VALUE
isatty() returns 1 if fd is an open file descriptor referring to a terminal; otherwise 0 is returned, and errno is set to indicate the error.ERRORS
- EBADF
- fd is not a valid file descriptor.
- EINVAL
- fd refers to a file other than a terminal. POSIX.1-2001 specifies the error ENOTTY for this case.
CONFORMING TO
SVr4, 4.3BSD, POSIX.1-2001.SEE ALSO
fstat(2), ttyname(3)COLOPHON
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