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#include <signal.h>
#include <errno.h>
#include "syscall.h"
int sigaltstack(const stack_t *ss, stack_t *old)
{
if (ss) {
if (ss->ss_size < MINSIGSTKSZ) {
errno = ENOMEM;
return -1;
}
if (ss->ss_flags & ~SS_DISABLE) {
errno = EINVAL;
return -1;
}
}
return syscall(SYS_sigaltstack, ss, old);
}
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