libeio/libeio.m4

dnl openbsd in it's neverending brokenness requires stdint.h for intptr_t,
dnl but that header isn't very portable...
AC_CHECK_HEADERS([stdint.h sys/syscall.h sys/prctl.h])

AC_SEARCH_LIBS(
   pthread_create,
   [pthread pthreads pthreadVC2],
   ,
   [AC_MSG_ERROR(pthread functions not found)]
)

AC_CACHE_CHECK(for utimes, ac_cv_utimes, [AC_LINK_IFELSE([AC_LANG_SOURCE([[
#include <sys/types.h>
#include <sys/time.h>
#include <utime.h>
struct timeval tv[2];
int res;
int main (void)
{
   res = utimes ("/", tv);
   return 0;
}
]])],ac_cv_utimes=yes,ac_cv_utimes=no)])
test $ac_cv_utimes = yes && AC_DEFINE(HAVE_UTIMES, 1, utimes(2) is available)

AC_CACHE_CHECK(for futimes, ac_cv_futimes, [AC_LINK_IFELSE([AC_LANG_SOURCE([[
#include <sys/types.h>
#include <sys/time.h>
#include <utime.h>
struct timeval tv[2];
int res;
int fd;
int main (void)
{
   res = futimes (fd, tv);
   return 0;
}
]])],ac_cv_futimes=yes,ac_cv_futimes=no)])
test $ac_cv_futimes = yes && AC_DEFINE(HAVE_FUTIMES, 1, futimes(2) is available)

AC_CACHE_CHECK(for readahead, ac_cv_readahead, [AC_LINK_IFELSE([AC_LANG_SOURCE([
#include <fcntl.h>
int main (void)
{
   int fd = 0;
   size_t count = 2;
   ssize_t res;
   res = readahead (fd, 0, count);
   return 0;
}
])],ac_cv_readahead=yes,ac_cv_readahead=no)])
test $ac_cv_readahead = yes && AC_DEFINE(HAVE_READAHEAD, 1, readahead(2) is available (linux))

AC_CACHE_CHECK(for fdatasync, ac_cv_fdatasync, [AC_LINK_IFELSE([AC_LANG_SOURCE([
#include <unistd.h>
int main (void)
{
   int fd = 0;
   fdatasync (fd);
   return 0;
}
])],ac_cv_fdatasync=yes,ac_cv_fdatasync=no)])
test $ac_cv_fdatasync = yes && AC_DEFINE(HAVE_FDATASYNC, 1, fdatasync(2) is available)

AC_CACHE_CHECK(for sendfile, ac_cv_sendfile, [AC_LINK_IFELSE([AC_LANG_SOURCE([
# include <sys/types.h>
#if __linux
# include <sys/sendfile.h>
#elif __FreeBSD__ || defined __APPLE__
# include <sys/socket.h>
# include <sys/uio.h>
#elif __hpux
# include <sys/socket.h>
#else
# error unsupported architecture
#endif
int main (void)
{
   int fd = 0;
   off_t offset = 1;
   size_t count = 2;
   ssize_t res;
#if __linux
   res = sendfile (fd, fd, &offset, count);
#elif __FreeBSD__
   res = sendfile (fd, fd, offset, count, 0, &offset, 0);
#elif __hpux
   res = sendfile (fd, fd, offset, count, 0, 0);
#endif
   return 0;
}
])],ac_cv_sendfile=yes,ac_cv_sendfile=no)])
test $ac_cv_sendfile = yes && AC_DEFINE(HAVE_SENDFILE, 1, sendfile(2) is available and supported)

AC_CACHE_CHECK(for sync_file_range, ac_cv_sync_file_range, [AC_LINK_IFELSE([AC_LANG_SOURCE([
#include <fcntl.h>
int main (void)
{
   int fd = 0;
   off64_t offset = 1;
   off64_t nbytes = 1;
   unsigned int flags = SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE|SYNC_FILE_RANGE_WAIT_AFTER;
   ssize_t res;
   res = sync_file_range (fd, offset, nbytes, flags);
   return 0;
}
])],ac_cv_sync_file_range=yes,ac_cv_sync_file_range=no)])
test $ac_cv_sync_file_range = yes && AC_DEFINE(HAVE_SYNC_FILE_RANGE, 1, sync_file_range(2) is available)

AC_CACHE_CHECK(for fallocate, ac_cv_linux_fallocate, [AC_LINK_IFELSE([AC_LANG_SOURCE([
#include <fcntl.h>
int main (void)
{
   int fd = 0;
   int mode = 0;
   off_t offset = 1;
   off_t len = 1;
   int res;
   res = fallocate (fd, mode, offset, len);
   return 0;
}
])],ac_cv_linux_fallocate=yes,ac_cv_linux_fallocate=no)])
test $ac_cv_linux_fallocate = yes && AC_DEFINE(HAVE_LINUX_FALLOCATE, 1, fallocate(2) is available)

AC_CACHE_CHECK(for sys_syncfs, ac_cv_sys_syncfs, [AC_LINK_IFELSE([AC_LANG_SOURCE([
#include <unistd.h>
#include <sys/syscall.h>
int main (void)
{
  int res = syscall (__NR_syncfs, (int)0);
}
])],ac_cv_sys_syncfs=yes,ac_cv_sys_syncfs=no)])
test $ac_cv_sys_syncfs = yes && AC_DEFINE(HAVE_SYS_SYNCFS, 1, syscall(__NR_syncfs) is available)

AC_CACHE_CHECK(for prctl_set_name, ac_cv_prctl_set_name, [AC_LINK_IFELSE([AC_LANG_SOURCE([
#include <sys/prctl.h>
int main (void)
{
  char *name = "test123";
  int res = prctl (PR_SET_NAME, (unsigned long)name, 0, 0, 0);
}
])],ac_cv_prctl_set_name=yes,ac_cv_prctl_set_name=no)])
test $ac_cv_prctl_set_name = yes && AC_DEFINE(HAVE_PRCTL_SET_NAME, 1, prctl(PR_SET_NAME) is available)

dnl #############################################################################
dnl # these checks exist for the benefit of IO::AIO

AC_CACHE_CHECK(for set/getrlimit, ac_cv_rlimits, [AC_LINK_IFELSE([AC_LANG_SOURCE([[
#include <sys/time.h>
#include <sys/resource.h>
int res;
int main (void)
{
   struct rlimit srl;
   srl.rlim_cur = srl.rlim_max = RLIM_INFINITY;
   res = getrlimit (RLIMIT_NOFILE, &srl);
   res = setrlimit (RLIMIT_NOFILE, &srl);
   return 0;
}
]])],ac_cv_rlimits=yes,ac_cv_rlimits=no)])
test $ac_cv_rlimits = yes && AC_DEFINE(HAVE_RLIMITS, 1, setrlimit/getrlimit is available)

dnl at least uclibc defines _POSIX_ADVISORY_INFO without *any* of the required
dnl functionality actually being present. ugh.
AC_CACHE_CHECK(for posix_madvise, ac_cv_posix_madvise, [AC_LINK_IFELSE([AC_LANG_SOURCE([
#include <sys/mman.h>
int main (void)
{
   int res = posix_madvise ((void *)0, (size_t)0, POSIX_MADV_NORMAL);
   int a = POSIX_MADV_SEQUENTIAL;
   int b = POSIX_MADV_RANDOM;
   int c = POSIX_MADV_WILLNEED;
   int d = POSIX_MADV_DONTNEED;
   return 0;
}
])],ac_cv_posix_madvise=yes,ac_cv_posix_madvise=no)])
test $ac_cv_posix_madvise = yes && AC_DEFINE(HAVE_POSIX_MADVISE, 1, posix_madvise(2) is available)

AC_CACHE_CHECK(for posix_fadvise, ac_cv_posix_fadvise, [AC_LINK_IFELSE([AC_LANG_SOURCE([
#define _XOPEN_SOURCE 600
#include <fcntl.h>
int main (void)
{
   int res = posix_fadvise ((int)0, (off_t)0, (off_t)0, POSIX_FADV_NORMAL);
   int a = POSIX_FADV_SEQUENTIAL;
   int b = POSIX_FADV_NOREUSE;
   int c = POSIX_FADV_RANDOM;
   int d = POSIX_FADV_WILLNEED;
   int e = POSIX_FADV_DONTNEED;
   return 0;
}
])],ac_cv_posix_fadvise=yes,ac_cv_posix_fadvise=no)])
test $ac_cv_posix_fadvise = yes && AC_DEFINE(HAVE_POSIX_FADVISE, 1, posix_fadvise(2) is available)

dnl lots of linux specifics
AC_CHECK_HEADERS([linux/fs.h linux/fiemap.h])

AC_CACHE_CHECK([for splice, vmsplice and tee], ac_cv_linux_splice, [AC_LINK_IFELSE([AC_LANG_SOURCE([
#include <fcntl.h>
int main (void)
{
   ssize_t res;
   res = splice ((int)0, (loff_t)0, (int)0, (loff_t *)0, (size_t)0, SPLICE_F_MOVE | SPLICE_F_NONBLOCK | SPLICE_F_MORE);
   res = tee ((int)0, (int)0, (size_t)0, SPLICE_F_NONBLOCK);
   res = vmsplice ((int)0, (struct iovec *)0, 0, SPLICE_F_NONBLOCK | SPLICE_F_GIFT);
   return 0;
}
])],ac_cv_linux_splice=yes,ac_cv_linux_splice=no)])
test $ac_cv_linux_splice = yes && AC_DEFINE(HAVE_LINUX_SPLICE, 1, splice/vmsplice/tee(2) are available)

AC_CACHE_CHECK(for pipe2, ac_cv_pipe2, [AC_LINK_IFELSE([AC_LANG_SOURCE([[
#include <fcntl.h>
#include <unistd.h>
int res;
int main (void)
{
   res = pipe2 (0, 0);
   return 0;
}
]])],ac_cv_pipe2=yes,ac_cv_pipe2=no)])
test $ac_cv_pipe2 = yes && AC_DEFINE(HAVE_PIPE2, 1, pipe2(2) is available)

AC_CACHE_CHECK(for eventfd, ac_cv_eventfd, [AC_LINK_IFELSE([AC_LANG_SOURCE([[
#include <sys/eventfd.h>
int res;
int main (void)
{
   res = eventfd (1, EFD_CLOEXEC | EFD_NONBLOCK);
   return 0;
}
]])],ac_cv_eventfd=yes,ac_cv_eventfd=no)])
test $ac_cv_eventfd = yes && AC_DEFINE(HAVE_EVENTFD, 1, eventfd(2) is available)

AC_CACHE_CHECK(for timerfd, ac_cv_timerfd, [AC_LINK_IFELSE([AC_LANG_SOURCE([[
#include <sys/timerfd.h>
int res;
int main (void)
{
   struct itimerspec its;
   res = timerfd_create (CLOCK_REALTIME, TFD_CLOEXEC | TFD_NONBLOCK);
   res = timerfd_settime (res, TFD_TIMER_ABSTIME /*| TFD_TIMER_CANCEL_ON_SET*/, &its, 0);
   res = timerfd_gettime (res, &its);
   return 0;
}
]])],ac_cv_timerfd=yes,ac_cv_timerfd=no)])
test $ac_cv_timerfd = yes && AC_DEFINE(HAVE_TIMERFD, 1, timerfd_*(2) are available)

AC_CACHE_CHECK(for renameat2, ac_cv_renameat2, [AC_LINK_IFELSE([AC_LANG_SOURCE([[
#include <unistd.h>
#include <sys/syscall.h>
#include <linux/fs.h>
int res;
int main (void)
{
   res = syscall (SYS_renameat2, 0, 0, 0, 0, RENAME_EXCHANGE | RENAME_NOREPLACE);
   return 0;
}
]])],ac_cv_renameat2=yes,ac_cv_renameat2=no)])
test $ac_cv_renameat2 = yes && AC_DEFINE(HAVE_RENAMEAT2, 1, renameat2(2) is available)

AC_CACHE_CHECK(for copy_file_range, ac_cv_copy_file_range, [AC_LINK_IFELSE([AC_LANG_SOURCE([[
#include <unistd.h>
#include <sys/syscall.h>
/*#include <linux/copy.h>*/
int res;
int main (void)
{
   /*res = syscall (SYS_copy_file_range, 0, 0, 0, 0, 0, COPY_FR_REFLINK | COPY_FR_DEDUP | COPY_FR_COPY);*/
   res = syscall (SYS_copy_file_range, 0, 0, 0, 0, 0, 0);
   return 0;
}
]])],ac_cv_copy_file_range=yes,ac_cv_copy_file_range=no)])
test $ac_cv_copy_file_range = yes && AC_DEFINE(HAVE_COPY_FILE_RANGE, 1, copy_file_range(2) is available)

AC_CACHE_CHECK(for posix_close, ac_cv_posix_close, [AC_LINK_IFELSE([AC_LANG_SOURCE([[
#include <unistd.h>
int res;
int main (void)
{
   res = posix_close (0, 0); /* we do not need any flags */
   return 0;
}
]])],ac_cv_posix_close=yes,ac_cv_posix_close=no)])
test $ac_cv_posix_close = yes && AC_DEFINE(HAVE_POSIX_CLOSE, 1, posix_close(2) is available)

Revision:	1.31
Committed:	Tue Feb 20 05:23:47 2018 UTC (6 years, 2 months ago) by root
Branch:	MAIN
CVS Tags:	rel-4_4, rel-4_5
Changes since 1.30:	+14 -0 lines
Log Message:	* empty log message *
#	Content
1	dnl openbsd in it's neverending brokenness requires stdint.h for intptr_t,
2	dnl but that header isn't very portable...
3	AC_CHECK_HEADERS([stdint.h sys/syscall.h sys/prctl.h])
4
5	AC_SEARCH_LIBS(
6	pthread_create,
7	[pthread pthreads pthreadVC2],
8	,
9	[AC_MSG_ERROR(pthread functions not found)]
10	)
11
12	AC_CACHE_CHECK(for utimes, ac_cv_utimes, [AC_LINK_IFELSE([AC_LANG_SOURCE([[
13	#include <sys/types.h>
14	#include <sys/time.h>
15	#include <utime.h>
16	struct timeval tv[2];
17	int res;
18	int main (void)
19	{
20	res = utimes ("/", tv);
21	return 0;
22	}
23	]])],ac_cv_utimes=yes,ac_cv_utimes=no)])
24	test $ac_cv_utimes = yes && AC_DEFINE(HAVE_UTIMES, 1, utimes(2) is available)
25
26	AC_CACHE_CHECK(for futimes, ac_cv_futimes, [AC_LINK_IFELSE([AC_LANG_SOURCE([[
27	#include <sys/types.h>
28	#include <sys/time.h>
29	#include <utime.h>
30	struct timeval tv[2];
31	int res;
32	int fd;
33	int main (void)
34	{
35	res = futimes (fd, tv);
36	return 0;
37	}
38	]])],ac_cv_futimes=yes,ac_cv_futimes=no)])
39	test $ac_cv_futimes = yes && AC_DEFINE(HAVE_FUTIMES, 1, futimes(2) is available)
40
41	AC_CACHE_CHECK(for readahead, ac_cv_readahead, [AC_LINK_IFELSE([AC_LANG_SOURCE([
42	#include <fcntl.h>
43	int main (void)
44	{
45	int fd = 0;
46	size_t count = 2;
47	ssize_t res;
48	res = readahead (fd, 0, count);
49	return 0;
50	}
51	])],ac_cv_readahead=yes,ac_cv_readahead=no)])
52	test $ac_cv_readahead = yes && AC_DEFINE(HAVE_READAHEAD, 1, readahead(2) is available (linux))
53
54	AC_CACHE_CHECK(for fdatasync, ac_cv_fdatasync, [AC_LINK_IFELSE([AC_LANG_SOURCE([
55	#include <unistd.h>
56	int main (void)
57	{
58	int fd = 0;
59	fdatasync (fd);
60	return 0;
61	}
62	])],ac_cv_fdatasync=yes,ac_cv_fdatasync=no)])
63	test $ac_cv_fdatasync = yes && AC_DEFINE(HAVE_FDATASYNC, 1, fdatasync(2) is available)
64
65	AC_CACHE_CHECK(for sendfile, ac_cv_sendfile, [AC_LINK_IFELSE([AC_LANG_SOURCE([
66	# include <sys/types.h>
67	#if __linux
68	# include <sys/sendfile.h>
69	#elif __FreeBSD__ \|\| defined __APPLE__
70	# include <sys/socket.h>
71	# include <sys/uio.h>
72	#elif __hpux
73	# include <sys/socket.h>
74	#else
75	# error unsupported architecture
76	#endif
77	int main (void)
78	{
79	int fd = 0;
80	off_t offset = 1;
81	size_t count = 2;
82	ssize_t res;
83	#if __linux
84	res = sendfile (fd, fd, &offset, count);
85	#elif __FreeBSD__
86	res = sendfile (fd, fd, offset, count, 0, &offset, 0);
87	#elif __hpux
88	res = sendfile (fd, fd, offset, count, 0, 0);
89	#endif
90	return 0;
91	}
92	])],ac_cv_sendfile=yes,ac_cv_sendfile=no)])
93	test $ac_cv_sendfile = yes && AC_DEFINE(HAVE_SENDFILE, 1, sendfile(2) is available and supported)
94
95	AC_CACHE_CHECK(for sync_file_range, ac_cv_sync_file_range, [AC_LINK_IFELSE([AC_LANG_SOURCE([
96	#include <fcntl.h>
97	int main (void)
98	{
99	int fd = 0;
100	off64_t offset = 1;
101	off64_t nbytes = 1;
102	unsigned int flags = SYNC_FILE_RANGE_WAIT_BEFORE\|SYNC_FILE_RANGE_WRITE\|SYNC_FILE_RANGE_WAIT_AFTER;
103	ssize_t res;
104	res = sync_file_range (fd, offset, nbytes, flags);
105	return 0;
106	}
107	])],ac_cv_sync_file_range=yes,ac_cv_sync_file_range=no)])
108	test $ac_cv_sync_file_range = yes && AC_DEFINE(HAVE_SYNC_FILE_RANGE, 1, sync_file_range(2) is available)
109
110	AC_CACHE_CHECK(for fallocate, ac_cv_linux_fallocate, [AC_LINK_IFELSE([AC_LANG_SOURCE([
111	#include <fcntl.h>
112	int main (void)
113	{
114	int fd = 0;
115	int mode = 0;
116	off_t offset = 1;
117	off_t len = 1;
118	int res;
119	res = fallocate (fd, mode, offset, len);
120	return 0;
121	}
122	])],ac_cv_linux_fallocate=yes,ac_cv_linux_fallocate=no)])
123	test $ac_cv_linux_fallocate = yes && AC_DEFINE(HAVE_LINUX_FALLOCATE, 1, fallocate(2) is available)
124
125	AC_CACHE_CHECK(for sys_syncfs, ac_cv_sys_syncfs, [AC_LINK_IFELSE([AC_LANG_SOURCE([
126	#include <unistd.h>
127	#include <sys/syscall.h>
128	int main (void)
129	{
130	int res = syscall (__NR_syncfs, (int)0);
131	}
132	])],ac_cv_sys_syncfs=yes,ac_cv_sys_syncfs=no)])
133	test $ac_cv_sys_syncfs = yes && AC_DEFINE(HAVE_SYS_SYNCFS, 1, syscall(__NR_syncfs) is available)
134
135	AC_CACHE_CHECK(for prctl_set_name, ac_cv_prctl_set_name, [AC_LINK_IFELSE([AC_LANG_SOURCE([
136	#include <sys/prctl.h>
137	int main (void)
138	{
139	char *name = "test123";
140	int res = prctl (PR_SET_NAME, (unsigned long)name, 0, 0, 0);
141	}
142	])],ac_cv_prctl_set_name=yes,ac_cv_prctl_set_name=no)])
143	test $ac_cv_prctl_set_name = yes && AC_DEFINE(HAVE_PRCTL_SET_NAME, 1, prctl(PR_SET_NAME) is available)
144
145	dnl #############################################################################
146	dnl # these checks exist for the benefit of IO::AIO
147
148	AC_CACHE_CHECK(for set/getrlimit, ac_cv_rlimits, [AC_LINK_IFELSE([AC_LANG_SOURCE([[
149	#include <sys/time.h>
150	#include <sys/resource.h>
151	int res;
152	int main (void)
153	{
154	struct rlimit srl;
155	srl.rlim_cur = srl.rlim_max = RLIM_INFINITY;
156	res = getrlimit (RLIMIT_NOFILE, &srl);
157	res = setrlimit (RLIMIT_NOFILE, &srl);
158	return 0;
159	}
160	]])],ac_cv_rlimits=yes,ac_cv_rlimits=no)])
161	test $ac_cv_rlimits = yes && AC_DEFINE(HAVE_RLIMITS, 1, setrlimit/getrlimit is available)
162
163	dnl at least uclibc defines _POSIX_ADVISORY_INFO without any of the required
164	dnl functionality actually being present. ugh.
165	AC_CACHE_CHECK(for posix_madvise, ac_cv_posix_madvise, [AC_LINK_IFELSE([AC_LANG_SOURCE([
166	#include <sys/mman.h>
167	int main (void)
168	{
169	int res = posix_madvise ((void *)0, (size_t)0, POSIX_MADV_NORMAL);
170	int a = POSIX_MADV_SEQUENTIAL;
171	int b = POSIX_MADV_RANDOM;
172	int c = POSIX_MADV_WILLNEED;
173	int d = POSIX_MADV_DONTNEED;
174	return 0;
175	}
176	])],ac_cv_posix_madvise=yes,ac_cv_posix_madvise=no)])
177	test $ac_cv_posix_madvise = yes && AC_DEFINE(HAVE_POSIX_MADVISE, 1, posix_madvise(2) is available)
178
179	AC_CACHE_CHECK(for posix_fadvise, ac_cv_posix_fadvise, [AC_LINK_IFELSE([AC_LANG_SOURCE([
180	#define _XOPEN_SOURCE 600
181	#include <fcntl.h>
182	int main (void)
183	{
184	int res = posix_fadvise ((int)0, (off_t)0, (off_t)0, POSIX_FADV_NORMAL);
185	int a = POSIX_FADV_SEQUENTIAL;
186	int b = POSIX_FADV_NOREUSE;
187	int c = POSIX_FADV_RANDOM;
188	int d = POSIX_FADV_WILLNEED;
189	int e = POSIX_FADV_DONTNEED;
190	return 0;
191	}
192	])],ac_cv_posix_fadvise=yes,ac_cv_posix_fadvise=no)])
193	test $ac_cv_posix_fadvise = yes && AC_DEFINE(HAVE_POSIX_FADVISE, 1, posix_fadvise(2) is available)
194
195	dnl lots of linux specifics
196	AC_CHECK_HEADERS([linux/fs.h linux/fiemap.h])
197
198	AC_CACHE_CHECK([for splice, vmsplice and tee], ac_cv_linux_splice, [AC_LINK_IFELSE([AC_LANG_SOURCE([
199	#include <fcntl.h>
200	int main (void)
201	{
202	ssize_t res;
203	res = splice ((int)0, (loff_t)0, (int)0, (loff_t *)0, (size_t)0, SPLICE_F_MOVE \| SPLICE_F_NONBLOCK \| SPLICE_F_MORE);
204	res = tee ((int)0, (int)0, (size_t)0, SPLICE_F_NONBLOCK);
205	res = vmsplice ((int)0, (struct iovec *)0, 0, SPLICE_F_NONBLOCK \| SPLICE_F_GIFT);
206	return 0;
207	}
208	])],ac_cv_linux_splice=yes,ac_cv_linux_splice=no)])
209	test $ac_cv_linux_splice = yes && AC_DEFINE(HAVE_LINUX_SPLICE, 1, splice/vmsplice/tee(2) are available)
210
211	AC_CACHE_CHECK(for pipe2, ac_cv_pipe2, [AC_LINK_IFELSE([AC_LANG_SOURCE([[
212	#include <fcntl.h>
213	#include <unistd.h>
214	int res;
215	int main (void)
216	{
217	res = pipe2 (0, 0);
218	return 0;
219	}
220	]])],ac_cv_pipe2=yes,ac_cv_pipe2=no)])
221	test $ac_cv_pipe2 = yes && AC_DEFINE(HAVE_PIPE2, 1, pipe2(2) is available)
222
223	AC_CACHE_CHECK(for eventfd, ac_cv_eventfd, [AC_LINK_IFELSE([AC_LANG_SOURCE([[
224	#include <sys/eventfd.h>
225	int res;
226	int main (void)
227	{
228	res = eventfd (1, EFD_CLOEXEC \| EFD_NONBLOCK);
229	return 0;
230	}
231	]])],ac_cv_eventfd=yes,ac_cv_eventfd=no)])
232	test $ac_cv_eventfd = yes && AC_DEFINE(HAVE_EVENTFD, 1, eventfd(2) is available)
233
234	AC_CACHE_CHECK(for timerfd, ac_cv_timerfd, [AC_LINK_IFELSE([AC_LANG_SOURCE([[
235	#include <sys/timerfd.h>
236	int res;
237	int main (void)
238	{
239	struct itimerspec its;
240	res = timerfd_create (CLOCK_REALTIME, TFD_CLOEXEC \| TFD_NONBLOCK);
241	res = timerfd_settime (res, TFD_TIMER_ABSTIME /\| TFD_TIMER_CANCEL_ON_SET/, &its, 0);
242	res = timerfd_gettime (res, &its);
243	return 0;
244	}
245	]])],ac_cv_timerfd=yes,ac_cv_timerfd=no)])
246	test $ac_cv_timerfd = yes && AC_DEFINE(HAVE_TIMERFD, 1, timerfd_*(2) are available)
247
248	AC_CACHE_CHECK(for renameat2, ac_cv_renameat2, [AC_LINK_IFELSE([AC_LANG_SOURCE([[
249	#include <unistd.h>
250	#include <sys/syscall.h>
251	#include <linux/fs.h>
252	int res;
253	int main (void)
254	{
255	res = syscall (SYS_renameat2, 0, 0, 0, 0, RENAME_EXCHANGE \| RENAME_NOREPLACE);
256	return 0;
257	}
258	]])],ac_cv_renameat2=yes,ac_cv_renameat2=no)])
259	test $ac_cv_renameat2 = yes && AC_DEFINE(HAVE_RENAMEAT2, 1, renameat2(2) is available)
260
261	AC_CACHE_CHECK(for copy_file_range, ac_cv_copy_file_range, [AC_LINK_IFELSE([AC_LANG_SOURCE([[
262	#include <unistd.h>
263	#include <sys/syscall.h>
264	/#include <linux/copy.h>/
265	int res;
266	int main (void)
267	{
268	/res = syscall (SYS_copy_file_range, 0, 0, 0, 0, 0, COPY_FR_REFLINK \| COPY_FR_DEDUP \| COPY_FR_COPY);/
269	res = syscall (SYS_copy_file_range, 0, 0, 0, 0, 0, 0);
270	return 0;
271	}
272	]])],ac_cv_copy_file_range=yes,ac_cv_copy_file_range=no)])
273	test $ac_cv_copy_file_range = yes && AC_DEFINE(HAVE_COPY_FILE_RANGE, 1, copy_file_range(2) is available)
274
275	AC_CACHE_CHECK(for posix_close, ac_cv_posix_close, [AC_LINK_IFELSE([AC_LANG_SOURCE([[
276	#include <unistd.h>
277	int res;
278	int main (void)
279	{
280	res = posix_close (0, 0); /* we do not need any flags */
281	return 0;
282	}
283	]])],ac_cv_posix_close=yes,ac_cv_posix_close=no)])
284	test $ac_cv_posix_close = yes && AC_DEFINE(HAVE_POSIX_CLOSE, 1, posix_close(2) is available)
285