This is procres/print_rlimit.c (Listing 36-2, page 758), an example from the book, The Linux Programming Interface.

The source code file is copyright 2022, Michael Kerrisk, and is licensed under the GNU Lesser General Public License, version 3.

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/* print_rlimit.c

   Print the soft and hard values of a specified resource limit.
#include <sys/resource.h>
#include "print_rlimit.h"       /* Declares function defined here */
#include "tlpi_hdr.h"
int                     /* Print 'msg' followed by limits for 'resource' */
printRlimit(const char *msg, int resource)
    struct rlimit rlim;

    if (getrlimit(resource, &rlim) == -1)
        return -1;

    printf("%s soft=", msg);
    if (rlim.rlim_cur == RLIM_INFINITY)
#ifdef RLIM_SAVED_CUR           /* Not defined on some implementations */
    else if (rlim.rlim_cur == RLIM_SAVED_CUR)
        printf("%lld", (long long) rlim.rlim_cur);

    printf("; hard=");
    if (rlim.rlim_max == RLIM_INFINITY)
#ifdef RLIM_SAVED_MAX           /* Not defined on some implementations */
    else if (rlim.rlim_max == RLIM_SAVED_MAX)
        printf("%lld\n", (long long) rlim.rlim_max);

    return 0;


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