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Mini Shell
Mini Shell
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
static size_t r(char* buf, size_t buf_size) {
ssize_t read_count;
do
read_count = read(0, buf, buf_size);
while (read_count < 0 && errno == EINTR);
if (read_count <= 0)
abort();
return (size_t)read_count;
}
static void w(const char* buf, size_t count) {
const char* end = buf + count;
while (buf < end) {
ssize_t write_count;
do
write_count = write(1, buf, count);
while (write_count < 0 && errno == EINTR);
if (write_count <= 0)
abort();
buf += write_count;
}
fprintf(stderr, "%zu", count);
fflush(stderr);
}
int main(void) {
w("0", 1);
while (1) {
char buf[256];
size_t read_count = r(buf, sizeof(buf));
// The JS part (test-child-process-stdio-overlapped.js) only writes the
// "exit" string when the buffer is empty, so the read is guaranteed to be
// atomic due to it being less than PIPE_BUF.
if (!strncmp(buf, "exit", read_count)) {
break;
}
w(buf, read_count);
}
return 0;
}
Zerion Mini Shell 1.0