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function old new delta __ppoll_time64 - 211 +211 check_got_signal_and_poll - 164 +164 read_key 607 601 -6 shell_builtin_read 1328 1318 -10 ------------------------------------------------------------------------------ (add/remove: 4/0 grow/shrink: 0/2 up/down: 375/-16) Total: 359 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright (C) 2025 Denys Vlasenko <vda.linux@googlemail.com>
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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//kbuild:lib-y += poll_with_signals.o
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#include "libbb.h"
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/* Shells, for example, need their line input and "read" builtin
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* to be interruptible, and the naive handling of it a-la:
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* if (bb_got_signal) {
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* errno = EINTR;
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* return -1;
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* }
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* poll(pfd, 1, -1); // signal here would set EINTR
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* is racy.
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* This is a bit heavy-handed, but safe wrt races:
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*/
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int FAST_FUNC check_got_signal_and_poll(struct pollfd pfd[1], int timeout)
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{
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int n;
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struct timespec tv;
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sigset_t orig_mask;
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if (bb_got_signal) /* optimization */
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goto eintr;
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if (timeout >= 0) {
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tv.tv_sec = timeout / 1000;
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tv.tv_nsec = (timeout % 1000) * 1000000;
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}
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/* test bb_got_signal, then poll(), atomically wrt signals */
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sigfillset(&orig_mask);
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sigprocmask2(SIG_BLOCK, &orig_mask);
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if (bb_got_signal) {
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sigprocmask2(SIG_SETMASK, &orig_mask);
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eintr:
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errno = EINTR; /* inform the caller that we got a signal */
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return -1;
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}
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n = ppoll(pfd, 1, timeout >= 0 ? &tv : NULL, &orig_mask);
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sigprocmask2(SIG_SETMASK, &orig_mask);
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return n;
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}
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