I re-implemented it in C and for some reason O_APPEND is set on stdout by default. But aside from that it works just as the Rust version. #define _GNU_SOURC

I re-implemented it in C and for some reason O_APPEND is set on stdout by default. But aside from that it works just as the Rust version. #define _GNU_SOURCE #include <fcntl.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #define BUF_SIZE 16384 static void unset_flag(int fd, int flag) { int flags = fcntl(fd, F_GETFL, 0); flags &= ~flags; fcntl(fd, F_SETFL, flags); } int main(int argc, char** argv) { int pipefd[2]; pipe(pipefd); unset_flag(STDOUT_FILENO, O_APPEND); for (int i = 1; i < argc; ++i) { int fd = strcmp(argv[i], "-") ? open(argv[i], O_RDONLY) : STDIN_FILENO; if (fd < 0) { fprintf(stderr, "%s: No such file or directory\n", argv[i]); exit(1); } while (splice(fd, NULL, pipefd[1], NULL, BUF_SIZE, 0)) splice(pipefd[0], NULL, STDOUT_FILENO, NULL, BUF_SIZE, 0); close(fd); } return 0; } WTFPL if anyone cares.