diff options
Diffstat (limited to 'missing/dup2.c')
-rw-r--r-- | missing/dup2.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/missing/dup2.c b/missing/dup2.c new file mode 100644 index 0000000000..c541149d4b --- /dev/null +++ b/missing/dup2.c @@ -0,0 +1,36 @@ +/* + * Copyright (c) 1991, Larry Wall + * + * You may distribute under the terms of either the GNU General Public + * License or the Artistic License, as specified in the README file. + */ + +#include "defines.h" + +#if defined(HAVE_FCNTL) && defined(F_DUPFD) +# include <fcntl.h> +#endif + +int +dup2(oldfd,newfd) +int oldfd; +int newfd; +{ +#if defined(HAVE_FCNTL) && defined(F_DUPFD) + close(newfd); + return fcntl(oldfd, F_DUPFD, newfd); +#else + int fdtmp[256]; + int fdx = 0; + int fd; + + if (oldfd == newfd) + return 0; + close(newfd); + while ((fd = dup(oldfd)) != newfd) /* good enough for low fd's */ + fdtmp[fdx++] = fd; + while (fdx > 0) + close(fdtmp[--fdx]); + return 0; +#endif +} |