From b20760c02318fa6da228587c401a8b2bb22a1aab Mon Sep 17 00:00:00 2001 From: Szabolcs Nagy Date: Sun, 15 Sep 2013 02:00:32 +0000 Subject: support configurable page size on mips, powerpc and microblaze PAGE_SIZE was hardcoded to 4096, which is historically what most systems use, but on several archs it is a kernel config parameter, user space can only know it at execution time from the aux vector. PAGE_SIZE and PAGESIZE are not defined on archs where page size is a runtime parameter, applications should use sysconf(_SC_PAGE_SIZE) to query it. Internally libc code defines PAGE_SIZE to libc.page_size, which is set to aux[AT_PAGESZ] in __init_libc and early in __dynlink as well. (Note that libc.page_size can be accessed without GOT, ie. before relocations are done) Some fpathconf settings are hardcoded to 4096, these should be actually queried from the filesystem using statfs. --- src/conf/sysconf.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'src/conf/sysconf.c') diff --git a/src/conf/sysconf.c b/src/conf/sysconf.c index 5dc1e453..97fd4fad 100644 --- a/src/conf/sysconf.c +++ b/src/conf/sysconf.c @@ -3,6 +3,7 @@ #include #include #include "syscall.h" +#include "libc.h" #define VER (-2) #define OFLOW (-3) @@ -42,7 +43,7 @@ long sysconf(int name) [_SC_MQ_OPEN_MAX] = -1, [_SC_MQ_PRIO_MAX] = OFLOW, [_SC_VERSION] = VER, - [_SC_PAGE_SIZE] = PAGE_SIZE, + [_SC_PAGE_SIZE] = OFLOW, [_SC_RTSIG_MAX] = 63, /* ?? */ [_SC_SEM_NSEMS_MAX] = SEM_NSEMS_MAX, [_SC_SEM_VALUE_MAX] = OFLOW, @@ -222,6 +223,8 @@ long sysconf(int name) if (name == _SC_ARG_MAX) return ARG_MAX; if (name == _SC_SEM_VALUE_MAX) return SEM_VALUE_MAX; if (name == _SC_MQ_PRIO_MAX) return MQ_PRIO_MAX; + /* name == _SC_PAGE_SIZE */ + return PAGE_SIZE; } else if (values[name] == CPUCNT) { unsigned char set[128] = {1}; int i, cnt; -- cgit v1.2.1