©2004 by Marc J. Rochkind. All rights reserved. Portions marked "Open Source" may be copied under license.

 

                 

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c1/sysconf.c

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/*
    Using sysconf
    Sec. 1.5.5

    Copyright 2003 by Marc J. Rochkind. All rights reserved.
    May be copied only for purposes and under conditions described
    on the Web page www.basepath.com/aup/copyright.htm.

    The Example Files are provided "as is," without any warranty;
    without even the implied warranty of merchantability or fitness
    for a particular purpose. The author and his publisher are not
    responsible for any damages, direct or incidental, resulting
    from the use or non-use of these Example Files.

    The Example Files may contain defects, and some contain deliberate
    coding mistakes that were included for educational reasons.
    You are responsible for determining if and how the Example Files
    are to be used.

*/

#include "defs.h"
#include <sys/utsname.h>

int main(void)
{
    bool lookup, optsymdefined;
    char *when, *sc_symb;
    struct utsname name;
    FILE *out = fopen("/aup/c1/susopen.txt", "w");

/*[sysconf1]*/
    long value;

#if defined(_POSIX_ASYNCHRONOUS_IO)
    printf("_POSIX_ASYNCHRONOUS_IO = %ld\n", (long)_POSIX_ASYNCHRONOUS_IO);
#else
    printf("_POSIX_ASYNCHRONOUS_IO undefined\n");
#endif
#if defined(_SC_ASYNCHRONOUS_IO)
    errno = 0;
    if ((value = sysconf(_SC_ASYNCHRONOUS_IO)) == -1)
        if (errno == EINVAL)
            EC_FAIL
        else
            printf("sysconf(...) = unsupported\n");
    else
        printf("sysconf(...) = %ld\n", value);
#else
    printf("_SC_ASYNCHRONOUS_IO undefined\n");
#endif
/*[]*/
{
/*[sysconf2]*/
    long value;

#if defined(_SC_ATEXIT_MAX)
    errno = 0;
    if ((value = sysconf(_SC_ATEXIT_MAX)) == -1)
        if (errno == EINVAL)
            EC_FAIL
        else
            printf("max atexit registrations: unlimited\n");
    else
        printf("max atexit registrations: %ld\n", value);
#else
    printf("_SC_ATEXIT_MAX undefined\n");
#endif
/*[]*/
    printf("LONG_MAX = %ld\n", LONG_MAX);
}

    ec_null( out )
    ec_neg1( uname(&name) )
#if 0
    printf("sysname = %s\n", name.sysname);
    printf("nodename = %s\n", name.nodename);
    printf("release = %s\n", name.release);
    printf("version = %s\n", name.version);
    printf("machine = %s\n", name.machine);
#endif
    printf("_POSIX_VERSION = %ld\n", _POSIX_VERSION);
#ifdef _XOPEN_UNIX
    printf("_XOPEN_VERSION = %ld\n", (long)_XOPEN_VERSION);
#else
    printf("_XOPEN_UNIX undefined\n");
#endif
return 0;

EC_CLEANUP_BGN
    exit(EXIT_FAILURE);
EC_CLEANUP_END
}

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