/Python/dup2.c
http://unladen-swallow.googlecode.com/ · C · 30 lines · 15 code · 3 blank · 12 comment · 5 complexity · c47aadebd2453d08388531f1b6200576 MD5 · raw file
- /*
- * 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.
- */
- #include <fcntl.h>
- #define BADEXIT -1
- int
- dup2(int fd1, int fd2)
- {
- if (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;
- }