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44 lines
833 B
44 lines
833 B
#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#define r_stdin 0
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#define r_stdout 1
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#define r_stderr 2
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#define LIKELY(e) __builtin_expect(!!(e), 1)
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#define UNLIKELY(e) __builtin_expect(!!(e), 0)
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static inline int dupall(int from)
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{
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if(UNLIKELY(dup2(from, r_stdin) < 0)) {
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perror("failed to dup2() stdin to sink");
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return 1;
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}
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if(UNLIKELY(dup2(from, r_stdout) < 0)) {
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perror("failed to dup2() stdout to sink");
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return 2;
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}
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#ifdef REPLACE_STDERR
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if(UNLIKELY(dup2(from, r_stderr) < 0)) {
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perror("failed to dup2() stderr to sink");
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#else
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if(UNLIKELY(close(r_stderr) != 0)) {
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perror("failed to close stderr");
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#endif
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return 3;
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}
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return 0;
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}
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int main(void)
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{
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int null = open("/dev/null", O_RDWR);
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if(UNLIKELY(null<0)) {
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perror("failed to open /dev/null");
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return 1;
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}
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return dupall(null);
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}
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