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author | Yu Jiung <jiung.yu@samsung.com> | 2016-11-10 16:24:08 +0900 |
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committer | Yu Jiung <jiung.yu@samsung.com> | 2016-11-10 16:25:02 +0900 |
commit | 8166b0204b6945a4fdb89bbae0b0b7168a7cf6e8 (patch) | |
tree | 81f0750d91aa467df3ee81cf30d22a65db2e6685 /m4/ax_check_user_namespace.m4 | |
parent | ccccebb78520ec3a26a18370936516b12ae5d53a (diff) | |
parent | 45e88a8337839e5fd88519bc55467053d521c9f6 (diff) | |
download | c-ares-8166b0204b6945a4fdb89bbae0b0b7168a7cf6e8.tar.gz c-ares-8166b0204b6945a4fdb89bbae0b0b7168a7cf6e8.tar.bz2 c-ares-8166b0204b6945a4fdb89bbae0b0b7168a7cf6e8.zip |
Merge branch 'tizen' into tizen_basetizen_4.0.m2_releasetizen_4.0.IoT.p1_releasesubmit/tizen_base/20170705.023439submit/tizen_base/20170703.013654submit/tizen_4.0_base/20170828.000001submit/tizen_4.0_base/20170828.000000submit/tizen_4.0_base/20170811.071500accepted/tizen/base/20170707.183634accepted/tizen/4.0/base/20170828.221324accepted/tizen/4.0/base/20170811.093019
Conflicts:
packaging/c-ares.spec
Change-Id: I1ec10e394aed3ef19ee21fefbe3aba7d7a615c74
Diffstat (limited to 'm4/ax_check_user_namespace.m4')
-rw-r--r-- | m4/ax_check_user_namespace.m4 | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/m4/ax_check_user_namespace.m4 b/m4/ax_check_user_namespace.m4 new file mode 100644 index 0000000..27ba698 --- /dev/null +++ b/m4/ax_check_user_namespace.m4 @@ -0,0 +1,54 @@ +# -*- Autoconf -*- + +# SYNOPSIS +# +# AX_CHECK_USER_NAMESPACE +# +# DESCRIPTION +# +# This macro checks whether the local system supports Linux user namespaces. +# If so, it calls AC_DEFINE(HAVE_USER_NAMESPACE). + +AC_DEFUN([AX_CHECK_USER_NAMESPACE],[dnl + AC_CACHE_CHECK([whether user namespaces are supported], + ax_cv_user_namespace,[ + AC_LANG_PUSH([C]) + AC_RUN_IFELSE([AC_LANG_SOURCE([[ +#define _GNU_SOURCE +#include <fcntl.h> +#include <sched.h> +#include <signal.h> +#include <stdio.h> +#include <string.h> +#include <sys/types.h> +#include <sys/wait.h> + +int userfn(void *d) { + usleep(100000); /* synchronize by sleep */ + return (getuid() != 0); +} +char userst[1024*1024]; +int main() { + char buffer[1024]; + int rc, status, fd; + pid_t child = clone(userfn, userst + 1024*1024, CLONE_NEWUSER|SIGCHLD, 0); + if (child < 0) return 1; + + sprintf(buffer, "/proc/%d/uid_map", child); + fd = open(buffer, O_CREAT|O_WRONLY|O_TRUNC, 0755); + sprintf(buffer, "0 %d 1\n", getuid()); + write(fd, buffer, strlen(buffer)); + close(fd); + + rc = waitpid(child, &status, 0); + if (rc <= 0) return 1; + if (!WIFEXITED(status)) return 1; + return WEXITSTATUS(status); +} + ]])],[ax_cv_user_namespace=yes],[ax_cv_user_namespace=no],[ax_cv_user_namespace=no]) + AC_LANG_POP([C]) + ]) + if test "$ax_cv_user_namespace" = yes; then + AC_DEFINE([HAVE_USER_NAMESPACE],[1],[Whether user namespaces are available]) + fi +]) # AX_CHECK_USER_NAMESPACE |