Advanced Programming in the UNIX® Environment

ptg10805159

224 Process Environment Chapter 7

#endif

#ifdef RLIMIT_SIGPENDING

doit(RLIMIT_SIGPENDING);

#endif

doit(RLIMIT_STACK);

#ifdef RLIMIT_SWAP

doit(RLIMIT_SWAP);

#endif

#ifdef RLIMIT_VMEM

doit(RLIMIT_VMEM);

#endif

exit(0);

}

static void

pr_limits(char *name, int resource)

{

struct rlimit limit;

unsigned long long lim;

if (getrlimit(resource, &limit) < 0)

err_sys("getrlimit error for %s", name);

printf("%-14s ", name);

if (limit.rlim_cur == RLIM_INFINITY) {

printf("(infinite) ");

}else {

lim = limit.rlim_cur;

printf("%10lld ", lim);

}

if (limit.rlim_max == RLIM_INFINITY) {

printf("(infinite)");

}else {

lim = limit.rlim_max;

printf("%10lld", lim);

}

putchar((int)’\n’);

}

Figure 7.16Print the current resource limits

Note that we’ve used the ISO C string-creation operator (#) in thedoitmacro, to

generate the string value for each resource name. When we say

doit(RLIMIT_CORE);

the C preprocessor expands this into

pr_limits("RLIMIT_CORE", RLIMIT_CORE);