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#include "builtins.h"
#include "shell.h"
#include <camellia.h>
#include <camellia/compat.h>
#include <camellia/flags.h>
#include <camellia/fs/misc.h>
#include <camellia/intr.h>
#include <camellia/syscalls.h>
#include <err.h>
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
#include <unistd.h>
#include <x86intrin.h>
int main();
static void execp(char **argv) {
if (!argv || !*argv) return;
if (strncmp(argv[0], "/", 1) == 0 ||
strncmp(argv[0], "./", 2) == 0 ||
strncmp(argv[0], "../", 3) == 0)
{
execv(argv[0], argv);
} else {
size_t cmdlen = strlen(argv[0]);
char *s = malloc(cmdlen + 6);
if (!s) err(1, "malloc");
memcpy(s, "/bin/", 5);
memcpy(s + 5, argv[0], cmdlen + 1);
execv(s, argv);
free(s);
}
}
void run_args(int argc, char **argv, struct redir *redir) {
if (!*argv) return;
/* "special" commands that can't be handled in a subprocess */
if (!strcmp(argv[0], "mount")) {
if (argc < 3) {
fprintf(stderr, "mount: not enough arguments\n");
return;
}
MOUNT_AT("/") {
fs_dirinject(argv[1]);
}
MOUNT_AT(argv[1]) {
run_args(argc - 2, argv + 2, redir);
exit(1);
}
return;
} else if (!strcmp(argv[0], "shadow")) {
if (argc < 2) {
fprintf(stderr, "shadow: missing path\n");
} else {
_sys_mount(-1, argv[1], strlen(argv[1]));
}
} else if (!strcmp(argv[0], "procmnt")) {
if (argc < 2) {
fprintf(stderr, "procmnt: missing mountpoint\n");
return;
}
camellia_procfs(argv[1]);
/*
if (!(3 <= argc && !strcmp(argv[2], "raw"))) {
if (!mount_at("/")) {
fs_dirinject(argv[1]);
exit(1);
}
}
*/
return;
} else if (!strcmp(argv[0], "cd")) {
if (chdir(argc > 1 ? argv[1] : "/") < 0)
perror("cd");
return;
} else if (!strcmp(argv[0], "time")) {
uint64_t time = __rdtsc();
uint64_t div = 3000;
run_args(argc - 1, argv + 1, redir);
time = __rdtsc() - time;
printf("%lu ns (assuming 3GHz)\n", time / div);
return;
} else if (!strcmp(argv[0], "exit")) {
exit(0);
} else if (!strcmp(argv[0], "getpid")) {
printf("my\t%d\nparent\t%d\n", getpid(), getppid());
return;
}
int pid = fork();
if (pid < 0) {
warn("fork");
return;
} else if (pid == 0) {
if (redir && redir->stdout) {
FILE *f = fopen(redir->stdout, redir->append ? "a" : "w");
if (!f) {
err(1, "couldn't open %s for redirection", redir->stdout);
}
// TODO fileno error checking
if (_sys_dup(fileno(f), 1, 0) < 0) {
errx(1, "dup() failed when redirecting");
}
}
for (struct builtin *iter = builtins; iter->name; iter++) {
if (!strcmp(argv[0], iter->name)) {
setprogname(argv[0]);
iter->fn(argc, argv);
exit(0);
}
}
execp(argv);
if (errno == EINVAL) {
errx(1, "%s isn't a valid executable", argv[0]);
} else {
errx(1, "unknown command: %s", argv[0]);
}
} else {
waitpid(pid, NULL, 0);
}
}
static void run(char *cmd) {
#define ARGV_MAX 16
char *argv[ARGV_MAX];
struct redir redir;
int argc = parse(cmd, argv, ARGV_MAX, &redir);
if (argc < 0) {
warn("parsing error");
} else {
run_args(argc, argv, &redir);
}
}
int main(int argc, char **argv) {
static char buf[256];
FILE *f = stdin;
intr_set(NULL);
if (argc > 1) {
f = fopen(argv[1], "r");
if (!f) {
err(1, "couldn't open %s", argv[1]);
return 1;
}
}
for (;;) {
if (f == stdin) {
printf("%s $ ", getcwd(buf, sizeof buf));
}
if (!fgets(buf, 256, f)) {
return 0;
}
run(buf);
}
}
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