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FreeBSD 11.0 - man page for dup3 (freebsd section 3)

DUP3(3) 						   BSD Library Functions Manual 						   DUP3(3)

dup3 -- duplicate an existing file descriptor
Standard C Library (libc, -lc)
#include <fcntl.h> #include <unistd.h> int dup3(int oldd, int newd, int flags);
The dup3() function duplicates an existing object descriptor while allowing the value of the new descriptor to be specified. The close-on-exec flag on the new file descriptor is determined by the O_CLOEXEC bit in flags. If oldd != newd and flags == 0, the behavior is identical to dup2(oldd, newd). If oldd == newd, then dup3() fails, unlike dup2(2).
The value -1 is returned if an error occurs. The external variable errno indicates the cause of the error.
The dup3() function fails if: [EBADF] The oldd argument is not a valid active descriptor or the newd argument is negative or exceeds the maximum allowable descriptor number [EINVAL] The oldd argument is equal to the newd argument. [EINVAL] The flags argument has bits set other than O_CLOEXEC.
accept(2), close(2), dup2(2), fcntl(2), getdtablesize(2), open(2), pipe(2), socket(2), socketpair(2)
The dup3() function does not conform to any standard.
The dup3() function appeared in FreeBSD 10.0.
August 16, 2013 BSD

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