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gh-112970: Detect and use closefrom() on platforms where it is available#112969

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1 @@
Use :c:func:`!closefrom` on Linux where available (e.g. glibc-2.34), rather than only FreeBSD.
6 changes: 3 additions & 3 deletionsPython/fileutils.c
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Original file line numberDiff line numberDiff line change
Expand Up@@ -2878,9 +2878,9 @@ _Py_GetLocaleconvNumeric(struct lconv *lc,
* non-opened fd in the middle.
* 2b. If fdwalk(3) isn't available, just do a plain close(2) loop.
*/
#ifdef__FreeBSD__
#ifdefHAVE_CLOSEFROM
# define USE_CLOSEFROM
#endif /*__FreeBSD__ */
#endif /*HAVE_CLOSEFROM */

#ifdef HAVE_FDWALK
# define USE_FDWALK
Expand DownExpand Up@@ -2922,7 +2922,7 @@ _Py_closerange(int first, int last)
#ifdef USE_CLOSEFROM
if (last >= sysconf(_SC_OPEN_MAX)) {
/* Any errors encountered while closing file descriptors are ignored */
closefrom(first);
(void)closefrom(first);
}
else
#endif /* USE_CLOSEFROM */
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6 changes: 6 additions & 0 deletionsconfigure
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2 changes: 1 addition & 1 deletionconfigure.ac
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Expand Up@@ -4743,7 +4743,7 @@ fi

# checks for library functions
AC_CHECK_FUNCS([ \
accept4 alarm bind_textdomain_codeset chmod chown clock close_range confstr \
accept4 alarm bind_textdomain_codeset chmod chown clockclosefromclose_range confstr \
copy_file_range ctermid dup dup3 execv explicit_bzero explicit_memset \
faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
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3 changes: 3 additions & 0 deletionspyconfig.h.in
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Expand Up@@ -157,6 +157,9 @@
/* Define to 1 if you have the `clock_settime' function. */
#undef HAVE_CLOCK_SETTIME

/* Define to 1 if you have the `closefrom' function. */
#undef HAVE_CLOSEFROM

/* Define to 1 if you have the `close_range' function. */
#undef HAVE_CLOSE_RANGE

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