52 lines
783 B
C
52 lines
783 B
C
/* this tests whether we can use mremap */
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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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#ifndef MAP_FAILED
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#define MAP_FAILED (int *)-1
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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 fd;
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int err = 1;
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fd = open(DATA, O_RDWR|O_CREAT|O_TRUNC, 0666);
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if (fd == -1) {
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exit(1);
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}
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buf = (int *)mmap(NULL, 0x1000, PROT_READ | PROT_WRITE,
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MAP_FILE | MAP_SHARED, fd, 0);
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if (buf == MAP_FAILED) {
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goto done;
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}
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buf = mremap(buf, 0x1000, 0x2000, MREMAP_MAYMOVE);
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if (buf == MAP_FAILED) {
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goto done;
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}
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err = 0;
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done:
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close(fd);
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unlink(DATA);
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exit(err);
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}
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