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b7ae41e6ca
If configure script is executed with stricter cflags
"-Werrorr=implicit-function-declaration -Werror=implicit-int"
then detection of few features will fail.
Checking for C99 vsnprintf : not found
Checking for HAVE_SHARED_MMAP : not found
Checking for HAVE_MREMAP : not found
lib/replace/test/shared_mmap.c:18:1:
error: return type defaults to ‘int’ [-Werror=implicit-int]
main()
^~~~
lib/replace/test/shared_mmap.c: In function ‘main’:
lib/replace/test/shared_mmap.c:25:16:
error: implicit declaration of function ‘exit’
[-Werror=implicit-function-declaration]
if (fd == -1) exit(1);
^~~~
lib/replace/test/shared_mmap.c:25:16:
warning: incompatible implicit declaration of built-in function ‘exit’
lib/replace/test/shared_mmap.c:25:16:
note: include ‘<stdlib.h>’ or provide a declaration of ‘exit’
Signed-off-by: Lukas Slebodnik <lslebodn@redhat.com>
Reviewed-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
72 lines
1.2 KiB
C
72 lines
1.2 KiB
C
/* this tests whether we can use a shared writeable mmap on a file -
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as needed for the mmap variant of FAST_SHARE_MODES */
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#if defined(HAVE_UNISTD_H)
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#include <unistd.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#define DATA "conftest.mmap"
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#ifndef MAP_FILE
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#define MAP_FILE 0
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#endif
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int main(void)
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{
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int *buf;
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int i;
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int fd = open(DATA,O_RDWR|O_CREAT|O_TRUNC,0666);
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int count=7;
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if (fd == -1) exit(1);
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for (i=0;i<10000;i++) {
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write(fd,&i,sizeof(i));
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}
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close(fd);
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if (fork() == 0) {
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fd = open(DATA,O_RDWR);
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if (fd == -1) exit(1);
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buf = (int *)mmap(NULL, 10000*sizeof(int),
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(PROT_READ | PROT_WRITE),
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MAP_FILE | MAP_SHARED,
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fd, 0);
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while (count-- && buf[9124] != 55732) sleep(1);
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if (count <= 0) exit(1);
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buf[1763] = 7268;
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exit(0);
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}
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fd = open(DATA,O_RDWR);
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if (fd == -1) exit(1);
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buf = (int *)mmap(NULL, 10000*sizeof(int),
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(PROT_READ | PROT_WRITE),
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MAP_FILE | MAP_SHARED,
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fd, 0);
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if (buf == (int *)-1) exit(1);
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buf[9124] = 55732;
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while (count-- && buf[1763] != 7268) sleep(1);
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unlink(DATA);
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if (count > 0) exit(0);
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exit(1);
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}
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