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Add renameat2 function [BZ #17662]

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The implementation falls back to renameat if renameat2 is not available
in the kernel (or in the kernel headers) and the flags argument is zero.
Without kernel support, a non-zero argument returns EINVAL, not ENOSYS.
This mirrors what the kernel does for invalid renameat2 flags.
This commit is contained in:
Florian Weimer
2018-07-05 18:59:02 +02:00
parent 1002d70823
commit d6da5cb6a8
45 changed files with 400 additions and 5 deletions
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12
libio/stdio.h
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@ -153,6 +153,18 @@ extern int renameat (int __oldfd, const char *__old, int __newfd,
const char *__new) __THROW;
#endif
#ifdef __USE_GNU
/* Flags for renameat2. */
# define RENAME_NOREPLACE (1 << 0)
# define RENAME_EXCHANGE (1 << 1)
# define RENAME_WHITEOUT (1 << 2)
/* Rename file OLD relative to OLDFD to NEW relative to NEWFD, with
additional flags. */
extern int renameat2 (int __oldfd, const char *__old, int __newfd,
const char *__new, unsigned int __flags) __THROW;
#endif
/* Create a temporary file and open it read/write.
This function is a possible cancellation point and therefore not