public domain dup2() should work on most Unix systems
R. Curtis Jackson
rcj at burl.UUCP
Wed Oct 10 09:50:22 AEST 1984
/*
* 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
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