rcj@burl.UUCP (R. Curtis Jackson) (10/10/84)
/* * Public domain dup2() lookalike * by Curtis Jackson @ AT&T Technologies, Burlington, NC * electronic address: burl!rcj * * dup2 performs the following functions: * * Check to make sure that fd1 is a valid open file descriptor. * Check to see if fd2 is already open; if so, close it. * Duplicate fd1 onto fd2; checking to make sure fd2 is a valid fd. * Return fd2 if all went well; return BADEXIT otherwise. */ # define BADEXIT -1 # include <fcntl.h> extern int errno; dup2(fd1, fd2) int fd1, fd2; { if (fcntl(fd1,F_GETFL) < 0) { return(BADEXIT); } if (fcntl(fd2,F_GETFL) >= 0) { close(fd2); } if (fcntl(fd1,F_DUPFD,fd2) < 0) { return(BADEXIT); } return(fd2); } -- The MAD Programmer -- 919-228-3313 (Cornet 291) alias: Curtis Jackson ...![ ihnp4 ulysses cbosgd mgnetp ]!burl!rcj ...![ ihnp4 cbosgd akgua masscomp ]!clyde!rcj