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generate_svn_version.sh
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Eric J. Korpela authored
on unix systems that don't synchronize writes to the same file from opposite sides of a pipe. svn path=/trunk/boinc/; revision=26058
Eric J. Korpela authoredon unix systems that don't synchronize writes to the same file from opposite sides of a pipe. svn path=/trunk/boinc/; revision=26058
sysconf.c 2.87 KiB
/*
* Copyright (c) 2019
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* MP support header */
#include "MacportsLegacySupport.h"
/* sysconf wrap */
#if __MPLS_LIB_SUPPORT_SYSCONF_WRAP__
#include <sys/types.h>
#include <sys/sysctl.h>
#include <unistd.h>
#include <dlfcn.h>
#include <stdlib.h>
/*
* Emulate several commonly used but missing (or broken) selectors from
* sysconf() on various OS versions.
*/
long sysconf(int name) {
static long (*os_sysconf)(int);
#if __MPLS_LIB_SUPPORT_SYSCONF_NPROCESSORS__
if ( name == _SC_NPROCESSORS_ONLN ) {
int nm[2];
int ret;
size_t len = 4;
uint32_t count;
nm[0] = CTL_HW; nm[1] = HW_AVAILCPU;
ret = sysctl(nm, 2, &count, &len, NULL, 0);
if (ret < 0 || count < 1) {
/* try again with _SC_NPROCESSORS_CONF */
return sysconf(_SC_NPROCESSORS_CONF);
} else {
return (long)count;
}
}
if ( name == _SC_NPROCESSORS_CONF ) {
int nm[2];
int ret;
size_t len = 4;
uint32_t count;
nm[0] = CTL_HW; nm[1] = HW_NCPU;
ret = sysctl(nm, 2, &count, &len, NULL, 0);
/* there has to be at least 1 processor */
if (ret < 0 || count < 1) { count = 1; }
return (long)count;
}
#endif /* __MPLS_LIB_SUPPORT_SYSCONF_NPROCESSORS__ */
#if __MPLS_LIB_SUPPORT_SYSCONF_PHYS_PAGES__
if ( name == _SC_PHYS_PAGES ) {
/* the number of pages is the total memory / pagesize */
uint64_t mem_size;
size_t len = sizeof(mem_size);
int pagesize = getpagesize();
sysctlbyname("hw.memsize", &mem_size, &len, NULL, 0);
return (long)(mem_size/pagesize);
}
#endif /* __MPLS_LIB_SUPPORT_SYSCONF_PHYS_PAGES__ */
/* for any other values of "name", call the real sysconf() */
if (!os_sysconf) {
os_sysconf = dlsym(RTLD_NEXT, "sysconf");
/* Something's badly broken if this fails */
if (!os_sysconf) {
abort();
}
}
return (*os_sysconf)(name);
}
/* compatibility function so code does not have to be recompiled */
long macports_legacy_sysconf(int name) { return sysconf(name); }
#endif /*__MPLS_LIB_SUPPORT_SYSCONF_WRAP__*/