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1 | # =========================================================================== |
2 | # http://www.gnu.org/software/autoconf-archive/ax_have_epoll.html | |
3 | # =========================================================================== | |
4 | # | |
5 | # SYNOPSIS | |
6 | # | |
7 | # AX_HAVE_EPOLL([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]) | |
8 | # AX_HAVE_EPOLL_PWAIT([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]) | |
9 | # | |
10 | # DESCRIPTION | |
11 | # | |
12 | # This macro determines whether the system supports the epoll I/O event | |
13 | # interface. A neat usage example would be: | |
14 | # | |
15 | # AX_HAVE_EPOLL( | |
16 | # [AX_CONFIG_FEATURE_ENABLE(epoll)], | |
17 | # [AX_CONFIG_FEATURE_DISABLE(epoll)]) | |
18 | # AX_CONFIG_FEATURE( | |
19 | # [epoll], [This platform supports epoll(7)], | |
20 | # [HAVE_EPOLL], [This platform supports epoll(7).]) | |
21 | # | |
22 | # The epoll interface was added to the Linux kernel in version 2.5.45, and | |
23 | # the macro verifies that a kernel newer than this is installed. This | |
24 | # check is somewhat unreliable if <linux/version.h> doesn't match the | |
25 | # running kernel, but it is necessary regardless, because glibc comes with | |
26 | # stubs for the epoll_create(), epoll_wait(), etc. that allow programs to | |
27 | # compile and link even if the kernel is too old; the problem would then | |
28 | # be detected only at runtime. | |
29 | # | |
30 | # Linux kernel version 2.6.19 adds the epoll_pwait() call in addition to | |
31 | # epoll_wait(). The availability of that function can be tested with the | |
32 | # second macro. Generally speaking, it is safe to assume that | |
33 | # AX_HAVE_EPOLL would succeed if AX_HAVE_EPOLL_PWAIT has, but not the | |
34 | # other way round. | |
35 | # | |
36 | # LICENSE | |
37 | # | |
38 | # Copyright (c) 2008 Peter Simons <simons@cryp.to> | |
39 | # | |
40 | # Copying and distribution of this file, with or without modification, are | |
41 | # permitted in any medium without royalty provided the copyright notice | |
42 | # and this notice are preserved. This file is offered as-is, without any | |
43 | # warranty. | |
44 | ||
45 | #serial 10 | |
46 | ||
47 | AC_DEFUN([AX_HAVE_EPOLL], [dnl | |
48 | ax_have_epoll_cppflags="${CPPFLAGS}" | |
49 | AC_CHECK_HEADER([linux/version.h], [CPPFLAGS="${CPPFLAGS} -DHAVE_LINUX_VERSION_H"]) | |
50 | AC_MSG_CHECKING([for Linux epoll(7) interface]) | |
51 | AC_CACHE_VAL([ax_cv_have_epoll], [dnl | |
52 | AC_LINK_IFELSE([dnl | |
53 | AC_LANG_PROGRAM([dnl | |
54 | #include <sys/epoll.h> | |
55 | #ifdef HAVE_LINUX_VERSION_H | |
56 | # include <linux/version.h> | |
57 | # if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,45) | |
58 | # error linux kernel version is too old to have epoll | |
59 | # endif | |
60 | #endif | |
61 | ], [dnl | |
62 | int fd, rc; | |
63 | struct epoll_event ev; | |
64 | fd = epoll_create(128); | |
65 | rc = epoll_wait(fd, &ev, 1, 0);])], | |
66 | [ax_cv_have_epoll=yes], | |
67 | [ax_cv_have_epoll=no])]) | |
68 | CPPFLAGS="${ax_have_epoll_cppflags}" | |
69 | AS_IF([test "${ax_cv_have_epoll}" = "yes"], | |
70 | [AC_MSG_RESULT([yes]) | |
71 | $1],[AC_MSG_RESULT([no]) | |
72 | $2]) | |
73 | ])dnl | |
74 | ||
75 | AC_DEFUN([AX_HAVE_EPOLL_PWAIT], [dnl | |
76 | ax_have_epoll_cppflags="${CPPFLAGS}" | |
77 | AC_CHECK_HEADER([linux/version.h], | |
78 | [CPPFLAGS="${CPPFLAGS} -DHAVE_LINUX_VERSION_H"]) | |
79 | AC_MSG_CHECKING([for Linux epoll(7) interface with signals extension]) | |
80 | AC_CACHE_VAL([ax_cv_have_epoll_pwait], [dnl | |
81 | AC_LINK_IFELSE([dnl | |
82 | AC_LANG_PROGRAM([dnl | |
83 | #ifdef HAVE_LINUX_VERSION_H | |
84 | # include <linux/version.h> | |
85 | # if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19) | |
86 | # error linux kernel version is too old to have epoll_pwait | |
87 | # endif | |
88 | #endif | |
89 | #include <sys/epoll.h> | |
90 | #include <signal.h> | |
91 | ], [dnl | |
92 | int fd, rc; | |
93 | struct epoll_event ev; | |
94 | fd = epoll_create(128); | |
95 | rc = epoll_wait(fd, &ev, 1, 0); | |
96 | rc = epoll_pwait(fd, &ev, 1, 0, (sigset_t const *)(0));])], | |
97 | [ax_cv_have_epoll_pwait=yes], | |
98 | [ax_cv_have_epoll_pwait=no])]) | |
99 | CPPFLAGS="${ax_have_epoll_cppflags}" | |
100 | AS_IF([test "${ax_cv_have_epoll_pwait}" = "yes"], | |
101 | [AC_MSG_RESULT([yes]) | |
102 | $1],[AC_MSG_RESULT([no]) | |
103 | $2]) | |
104 | ])dnl | |
105 |