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daemon: Use ‘close_range’ where available.

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* nix/libutil/util.cc (closeMostFDs) [HAVE_CLOSE_RANGE]: Use
‘close_range’ when ‘exceptions’ is empty.
* config-daemon.ac: Check for <linux/close_range.h> and the
‘close_range’ symbol.

Change-Id: I12fa3bde58b003fcce5ea5a1fee1dcf9a92c0359
This commit is contained in:
Ludovic Courtès 2025-02-11 17:42:37 +01:00
parent 92205bab4d
commit f03e6eff2f
No known key found for this signature in database
GPG key ID: 090B11993D9AEBB5
2 changed files with 20 additions and 8 deletions
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5
config-daemon.ac
View file

@ -78,7 +78,8 @@ if test "x$guix_build_daemon" = "xyes"; then
dnl Chroot support.
AC_CHECK_FUNCS([chroot unshare])
AC_CHECK_HEADERS([sched.h sys/param.h sys/mount.h sys/syscall.h])
AC_CHECK_HEADERS([sched.h sys/param.h sys/mount.h sys/syscall.h \
linux/close_range.h])
if test "x$ac_cv_func_chroot" != "xyes"; then
AC_MSG_ERROR(['chroot' function missing, bailing out])
@ -95,7 +96,7 @@ if test "x$guix_build_daemon" = "xyes"; then
dnl strsignal: for error reporting.
dnl statx: fine-grain 'stat' call, new in glibc 2.28.
AC_CHECK_FUNCS([lutimes lchown posix_fallocate sched_setaffinity \
statvfs nanosleep strsignal statx])
statvfs nanosleep strsignal statx close_range])
dnl Check for <locale>.
AC_LANG_PUSH(C++)

23
nix/libutil/util.cc
View file

@ -23,6 +23,10 @@
#include <sys/prctl.h>
#endif
#ifdef HAVE_LINUX_CLOSE_RANGE_H
# include <linux/close_range.h>
#endif
extern char * * environ;
@ -1087,12 +1091,19 @@ string runProgram(Path program, bool searchPath, const Strings & args)
void closeMostFDs(const set<int> & exceptions)
{
int maxFD = 0;
maxFD = sysconf(_SC_OPEN_MAX);
for (int fd = 0; fd < maxFD; ++fd)
if (fd != STDIN_FILENO && fd != STDOUT_FILENO && fd != STDERR_FILENO
&& exceptions.find(fd) == exceptions.end())
close(fd); /* ignore result */
#ifdef HAVE_CLOSE_RANGE
if (exceptions.empty())
close_range(3, ~0U, 0);
else
#endif
{
int maxFD = 0;
maxFD = sysconf(_SC_OPEN_MAX);
for (int fd = 0; fd < maxFD; ++fd)
if (fd != STDIN_FILENO && fd != STDOUT_FILENO && fd != STDERR_FILENO
&& exceptions.find(fd) == exceptions.end())
close(fd); /* ignore result */
}
}