36 lines
591 B
C
36 lines
591 B
C
#include <signal.h>
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#include <unistd.h>
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#include <setjmp.h>
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#include <stdio.h>
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static void sig_alrm(int);
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static jmp_buf env_alrm;
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int main(void) {
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int n;
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char line[256];
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if(signal(SIGALRM, sig_alrm) == SIG_ERR) {
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printf("signal(SIGALRM) error\n");
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return -1;
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}
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if(setjmp(env_alrm) != 0) {
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printf("read timeout\n");
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return -1;
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}
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alarm(5);
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if((n = read(STDIN_FILENO, line, 256) < 0)) {
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printf("read error\n");
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return -1;
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}
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alarm(0);
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write(STDOUT_FILENO, line, n);
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return 0;
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}
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static void sig_alrm(int signo) {
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longjmp(env_alrm, 1);
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}
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