31 lines
856 B
C
31 lines
856 B
C
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// Redirect standard output temporarily to a pipe, then restore
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// standard output and retrieve the captured output
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#define PREAD 0 // index of read end of pipe
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#define PWRITE 1 // index of write end of pipe
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int main(){
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setvbuf(stdout, NULL, _IONBF, 0); // Turn off buffering
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printf("Piping\n");
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int my_pipe[2];
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pipe(my_pipe);
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int stdout_bak = dup(STDOUT_FILENO);
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// int stderr_bak = dup(STDERR_FILENO);
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dup2(my_pipe[PWRITE],STDOUT_FILENO);
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printf("In the my_pipe, five by five");
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dup2(stdout_bak, STDOUT_FILENO);
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close(my_pipe[PWRITE]);
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printf("Read from the my_pipe\n");
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char buf[2048];
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int bytes_read = read(my_pipe[PREAD], buf, 2048);
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buf[bytes_read] = '\0';
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close(my_pipe[PREAD]);
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printf("Read: '%s'\n",buf);
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return 0;
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}
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