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mmap.c
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C/C++ Source or Header
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1994-10-16
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662b
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43 lines
/*
** A small test program to see if we can do shared read/write mapped
** regions.
**
** bambi
*/
#include <stdio.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/mman.h>
#define PATH "/tmp/MmAp-TeSt"
main()
{
int fd,
res;
static char text[] = "Test Data";
caddr_t cp;
fd = open(PATH,O_CREAT|O_RDWR|O_TRUNC);
if (fd < 0)
{
fprintf(stderr,"mmap test : couldn't create tmp file!\n\n");
exit(1);
}
write(fd,text,strlen(text));
cp = mmap(NULL,strlen(text), PROT_READ|PROT_WRITE, MAP_SHARED, fd,0);
if (cp == (caddr_t) -1)
{
res = 1;
}
else
{
res=0;
munmap(cp,strlen(text));
}
close(fd);
unlink(PATH);
exit(res);
}