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Linux: consolidate dup2 implementation

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Use dup2 syscall if defined, otherwise use dup3.

Checked on x86_64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Adhemerval Zanella Netto 2022-10-19 19:14:08 -03:00 committed by Adhemerval Zanella
parent 1001abfa14
commit 33ef940302
1 changed files with 7 additions and 2 deletions
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9
sysdeps/unix/sysv/linux/generic/dup2.c → sysdeps/unix/sysv/linux/dup2.c
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@ -1,4 +1,5 @@
/* Copyright (C) 2011-2022 Free Software Foundation, Inc.
/* Duplicate a file descriptor. Linux version.
Copyright (C) 2011-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -24,12 +25,16 @@
int
__dup2 (int fd, int fd2)
{
#ifdef __NR_dup2
return INLINE_SYSCALL_CALL (dup2, fd, fd2);
#else
/* For the degenerate case, check if the fd is valid (by trying to
get the file status flags) and return it, or else return EBADF. */
if (fd == fd2)
return __libc_fcntl (fd, F_GETFL, 0) < 0 ? -1 : fd;
return INLINE_SYSCALL (dup3, 3, fd, fd2, 0);
return INLINE_SYSCALL_CALL (dup3, fd, fd2, 0);
#endif
}
libc_hidden_def (__dup2)
weak_alias (__dup2, dup2)