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open.2: In O_TMPFILE example, describe alternative linkat() call 

This was already shown in an earlier version of the page,
but Adam Borowski's patch replaced it with an alternative.
Probably, it is better to show both possibilities.

Reported-by: "Joseph C. Sible" <josephcsible@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2020-02-07 17:39:51 +01:00
parent fc29a199d9
commit a2587fbb2e
1 changed files with 10 additions and 0 deletions
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man2/open.2
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@ -812,6 +812,16 @@ fd = open("/path/to/dir", O_TMPFILE | O_RDWR,
/* File I/O on 'fd'... */
linkat(fd, NULL, AT_FDCWD, "/path/for/file", AT_EMPTY_PATH);
/* If the caller doesn't have the CAP_DAC_READ_SEARCH
capability (needed to use AT_EMPTY_PATH with linkat(2)),
and there is a proc(5) filesystem mounted, then the
linkat(2) call above can be replaced with:
snprintf(path, PATH_MAX, "/proc/self/fd/%d", fd);
linkat(AT_FDCWD, path, AT_FDCWD, "/path/for/file",
AT_SYMLINK_FOLLOW);
*/
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