45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
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#include <sys/select.h>
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#include <signal.h>
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#include <stdint.h>
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#include <errno.h>
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#include "syscall.h"
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#define IS32BIT(x) !((x)+0x80000000ULL>>32)
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#define CLAMP(x) (int)(IS32BIT(x) ? (x) : 0x7fffffffU+((0ULL+(x))>>63))
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int select(int n, fd_set *restrict rfds, fd_set *restrict wfds, fd_set *restrict efds, struct timeval *restrict tv)
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{
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time_t s = tv ? tv->tv_sec : 0;
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suseconds_t us = tv ? tv->tv_usec : 0;
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long ns;
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const time_t max_time = (1ULL<<8*sizeof(time_t)-1)-1;
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if (s<0 || us<0) return __syscall_ret(-EINVAL);
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if (us/1000000 > max_time - s) {
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s = max_time;
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us = 999999;
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ns = 999999999;
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} else {
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s += us/1000000;
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us %= 1000000;
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ns = us*1000;
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}
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#ifdef SYS_pselect6_time64
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int r = -ENOSYS;
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if (SYS_pselect6 == SYS_pselect6_time64 || !IS32BIT(s))
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r = __syscall_cp(SYS_pselect6_time64, n, rfds, wfds, efds,
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tv ? ((long long[]){s, ns}) : 0,
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((syscall_arg_t[]){ 0, _NSIG/8 }));
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if (SYS_pselect6 == SYS_pselect6_time64 || r!=-ENOSYS)
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return __syscall_ret(r);
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#endif
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#ifdef SYS_select
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return syscall_cp(SYS_select, n, rfds, wfds, efds,
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tv ? ((long[]){s, us}) : 0);
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#else
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return syscall_cp(SYS_pselect6, n, rfds, wfds, efds,
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tv ? ((long[]){s, ns}) : 0, ((syscall_arg_t[]){ 0, _NSIG/8 }));
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#endif
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}
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