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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define BUF_SIZE 32
int pipe_fds[2];
void term(const char *msg) {
if (msg) {
fprintf(stderr, "Error: %s\n", msg);
fflush(stderr);
}
int close_fail = 0;
int ret = close(pipe_fds[0]);
if (ret < 0) {
fprintf(stderr, "Error: Couldn't close reading end of pipe\n");
fflush(stderr);
close_fail = 1;
}
ret = close(pipe_fds[1]);
if (ret < 0) {
fprintf(stderr, "Error: Couldn't close writing end of pipe\n");
fflush(stderr);
close_fail = 1;
}
exit((msg || close_fail) ? EXIT_FAILURE : EXIT_SUCCESS);
}
int main(void) {
int ret = pipe(pipe_fds);
if (ret < 0)
term("Couldn't create pipe");
char out_buf[] = "hello";
ret = write(pipe_fds[1], out_buf, strlen(out_buf) + 1);
if (ret < 0)
term("Couldn't write to pipe");
printf("send msg: %s\n", out_buf);
char in_buf[BUF_SIZE];
memset(in_buf, 0, BUF_SIZE);
ret = read(pipe_fds[0], in_buf, BUF_SIZE - 1);
if (ret < 0)
term("Couldn't read from pipe");
printf("recv msg: %s\n", in_buf);
return 0;
}
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