-> Click here to learn how to get live help <-
NAMEmkfifo - make a FIFO special file (a named pipe)
#include <sys/types.h> #include <sys/stat.h> int mkfifo(const char *pathname, mode_t mode);
DESCRIPTIONfBmkfifofP makes a FIFO special file with name fIpathnamefP. fImodefP specifies the FIFO's permissions. It is modified by the process's fBumaskfP in the usual way: the permissions of the created file are fB(fPfImodefPfB & ~umask)fP.
A FIFO special file is similar to a pipe, except that it is created in a different way. Instead of being an anonymous communications channel, a FIFO special file is entered into the file system by calling fBmkfifofP.
Once you have created a FIFO special file in this way, any process can open it for reading or writing, in the same way as an ordinary file. However, it has to be open at both ends simultaneously before you can proceed to do any input or output operations on it. Opening a FIFO for reading normally blocks until some other process opens the same FIFO for writing, and vice versa. See fifo(4) for non-blocking handling of FIFO special files.
RETURN VALUEThe normal, successful return value from fImkfifofP is fB0fP. In the case of an error, fB-1fP is returned (in which case, fIerrnofP is set appropriately).
SEE ALSOmkfifo(1), read(2), write(2), open(2), close(2), stat(2), umask(2), fifo(4)