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util, pasta: Add do_clone() wrapper around __clone2() and clone()
Spotted in Debian's buildd logs: on ia64, clone(2) is not available: the glibc wrapper is named __clone2() and it takes, additionally, the size of the stack area passed by the caller. Add a do_clone() wrapper handling the different cases, and also taking care of pointing the child's stack in the middle of the allocated area: on PA-RISC (hppa), handled by clone(), the stack grows up, and on ia64 the stack grows down, but the register backing store grows up -- and I think it might be actually used here. Suggested-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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3 changed files with 31 additions and 8 deletions
8
util.h
8
util.h
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@ -81,13 +81,15 @@
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(((struct in_addr *)(a))->s_addr == ((struct in_addr *)b)->s_addr)
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#define NS_FN_STACK_SIZE (RLIMIT_STACK_VAL * 1024 / 8)
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int do_clone(int (*fn)(void *), char *stack_area, size_t stack_size, int flags,
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void *arg);
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#define NS_CALL(fn, arg) \
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do { \
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char ns_fn_stack[NS_FN_STACK_SIZE]; \
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\
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clone((fn), ns_fn_stack + sizeof(ns_fn_stack) / 2, \
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CLONE_VM | CLONE_VFORK | CLONE_FILES | SIGCHLD, \
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(void *)(arg)); \
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do_clone((fn), ns_fn_stack, sizeof(ns_fn_stack), \
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CLONE_VM | CLONE_VFORK | CLONE_FILES | SIGCHLD,\
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(void *)(arg)); \
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} while (0)
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#if __BYTE_ORDER == __BIG_ENDIAN
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