int
main(int argc, char **argv)
{
printf("SEM_NSEMS_MAX = %ld, SEM_VALUE_MAX = %ld\n",
Sysconf(_SC_SEM_NSEMS_MAX), Sysconf(_SC_SEM_VALUE_MAX));
exit(0);
}
int
main(int argc, char **argv)
{
int fd, i;
char *ptr;
size_t filesize, mmapsize, pagesize;
if (argc != 4)
err_quit("usage: test1 <pathname> <filesize> <mmapsize>");
filesize = atoi(argv[2]);
mmapsize = atoi(argv[3]);
/* 4open file: create or truncate; set file size */
fd = Open(argv[1], O_RDWR | O_CREAT | O_TRUNC, FILE_MODE);
Lseek(fd, filesize-1, SEEK_SET);
Write(fd, "", 1);
ptr = Mmap(NULL, mmapsize, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
Close(fd);
pagesize = Sysconf(_SC_PAGESIZE);
printf("PAGESIZE = %ld\n", (long) pagesize);
for (i = 0; i < max(filesize, mmapsize); i += pagesize) {
printf("ptr[%d] = %d\n", i, ptr[i]);
ptr[i] = 1;
printf("ptr[%d] = %d\n", i + pagesize - 1, ptr[i + pagesize - 1]);
ptr[i + pagesize - 1] = 1;
}
printf("ptr[%d] = %d\n", i, ptr[i]);
exit(0);
}
long
__sysconf (int var)
{
long r;
if ((r = Sysconf(var)) != -ENOSYS)
{
if (r < 0)
return -1;
else
return r;
}
switch(var) {
case _SC_LAST:
return 4;
case _SC_MEMR_MAX:
return UNLIMITED; /* not true for TOS < 1.4 :-( */
case _SC_ARG_MAX:
return 127; /* ignore this, cuz we can pass via the env */
case _SC_OPEN_MAX:
return 45; /* think I read this somewhere */
case _SC_NGROUPS_MAX:
return NGROUPS_MAX;
case _SC_CHILD_MAX:
return UNLIMITED; /* good 'ol TOS :-) */
default:
return -1;
}
}
// FIXME should take a list of supplementary groups to use with setgroups(2)
int drop_privs(const char *username,const char *groupname){
long buflen;
if((buflen = Sysconf(_SC_GETPW_R_SIZE_MAX)) < 0){
nag("Couldn't look up getpwnam_r buffer len\n");
// FIXME this won't allow an overwrite, but it might allow
// a truncation. we ought size based off failed return value
buflen = BUFSIZ;
}
return drop_privs_r(username,groupname,buflen);
}
int main(int argc, char *argv[])
{
printf("MQ_OPEN_MAX = %ld, MQ_PRIO_MAX = %ld\n",
Sysconf(o_SC_MQ_OPEN_MAX), Sysconf(_SC_MQ_PRIO_MAX));
return 0;
}
static long
parse_cpuinfo(void){
return num_cpus = Sysconf(_SC_NPROCESSORS_ONLN);
}
