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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/wait.h>
#include "utils.h"
#include "exec.h"
#include "preproc.h"
#include "expand.h"
void execute_command(Command cmd, int* pgid) {
pid_t pid = fork();
if (pid == 0) {
if (*pgid == -1) {
setpgid(0, 0);
} else {
setpgid(0, *pgid);
}
dup2(cmd.stdin_fd, STDIN_FILENO);
dup2(cmd.stdout_fd, STDOUT_FILENO);
for (int j = 0; j < cmd.redirs.count; j++) {
FdRedirect fd_rd = *get_from_FdRedirectVec(&cmd.redirs, j);
dup2(fd_rd.new_fd, fd_rd.old_fd);
}
for (int i = 0; i < cmd.child_close_fds.count; i++) {
close(*get_from_IntVec(&cmd.child_close_fds, i));
}
signal(SIGINT, SIG_DFL);
signal(SIGQUIT, SIG_DFL);
signal(SIGTSTP, SIG_DFL);
signal(SIGTTIN, SIG_DFL);
signal(SIGTTOU, SIG_DFL);
execvp(cmd.args[0], cmd.args);
exit(67);
}
if (*pgid == -1) {
setpgid(pid, pid);
*pgid = pid;
} else {
setpgid(pid, *pgid);
}
}
Command make_command(ExpandedPipelineElement elem) {
Command cmd = {
.child_close_fds = make_IntVec(64),
.parent_close_fds = make_IntVec(64),
.redirs = make_FdRedirectVec(32),
.term = elem.conn,
};
StrVec arg_strs = make_StrVec(256);
for (int i = 0; i < elem.cmd_slots.count; i++) {
Slot curr_slot = *get_from_SlotVec(&elem.cmd_slots, i);
Slot next_slot;
int fd;
FdRedirect redir;
switch (curr_slot.kind) {
case SLOT_STR:
push_to_StrVec(&arg_strs, curr_slot.as.str);
break;
case SLOT_SPEC:
switch (curr_slot.as.spec) {
case READ_REDIR:
i++;
next_slot = *get_from_SlotVec(&elem.cmd_slots, i);
if (next_slot.kind != SLOT_STR) exit(6);
fd = open(next_slot.as.str, O_RDONLY, 0644);
redir = (FdRedirect){.old_fd = STDIN_FILENO, .new_fd = fd};
push_to_FdRedirectVec(&cmd.redirs, redir);
push_to_IntVec(&cmd.parent_close_fds, fd);
push_to_IntVec(&cmd.child_close_fds, fd);
break;
case WRITE_REDIR_TRUNC:
i++;
next_slot = *get_from_SlotVec(&elem.cmd_slots, i);
if (next_slot.kind != SLOT_STR) exit(6);
fd = open(next_slot.as.str, O_WRONLY | O_CREAT | O_TRUNC , 0644);
redir = (FdRedirect){.old_fd = STDOUT_FILENO, .new_fd = fd};
push_to_FdRedirectVec(&cmd.redirs, redir);
push_to_IntVec(&cmd.parent_close_fds, fd);
push_to_IntVec(&cmd.child_close_fds, fd);
break;
case WRITE_REDIR_APPEND:
i++;
next_slot = *get_from_SlotVec(&elem.cmd_slots, i);
if (next_slot.kind != SLOT_STR) exit(6);
fd = open(next_slot.as.str, O_WRONLY | O_CREAT | O_APPEND, 0644);
redir = (FdRedirect){.old_fd = STDOUT_FILENO, .new_fd = fd};
push_to_FdRedirectVec(&cmd.redirs, redir);
push_to_IntVec(&cmd.parent_close_fds, fd);
push_to_IntVec(&cmd.child_close_fds, fd);
break;
default:
exit(7);
}
break;
default:
exit(67);
// TODO: other slot kinds
}
}
cmd.args = malloc(sizeof(char*) * arg_strs.count);
for (int j = 0; j < arg_strs.count; j++) {
cmd.args[j] = *get_from_StrVec(&arg_strs, j);
}
return cmd;
}
void run_cmds(CommandVec cmds) {
signal(SIGTTIN, SIG_IGN);
signal(SIGTTOU, SIG_IGN);
int trunk_fd = STDIN_FILENO;
int pgid = -1;
for (int i = 0; i < cmds.count; i++) {
Command cmd = *get_from_CommandVec(&cmds, i);
cmd.stdin_fd = trunk_fd;
if (i > 0) {
push_to_IntVec(&cmd.child_close_fds, trunk_fd);
push_to_IntVec(&cmd.parent_close_fds, trunk_fd);
}
cmd.stdout_fd = STDOUT_FILENO;
if (cmd.term == CONN_PIPE) {
int pipe_fds[2];
pipe(pipe_fds);
cmd.stdout_fd = pipe_fds[1];
push_to_IntVec(&cmd.child_close_fds, pipe_fds[1]);
push_to_IntVec(&cmd.parent_close_fds, pipe_fds[1]);
trunk_fd = pipe_fds[0];
}
execute_command(cmd, &pgid);
for (int j = 0; j < cmd.parent_close_fds.count; j++) {
close(*get_from_IntVec(&cmd.parent_close_fds, j));
}
}
tcsetpgrp(STDIN_FILENO, pgid);
while (waitpid(-pgid, NULL, 0) > 0);
tcsetpgrp(STDIN_FILENO, getpgrp());
}
CommandVec make_cmd_vec_pl(ExpandedPipeline pl) {
CommandVec cmds = make_CommandVec(256);
for (int i = 0; i < pl.count; i++) {
ExpandedPipelineElement elem = *get_from_ExpandedPipeline(&pl, i);
Command cmd = make_command(elem);
push_to_CommandVec(&cmds, cmd);
}
return cmds;
}
void process_input_line(char* line, ShellState* shstate) {
PreprocArena arena = {
.tokens = make_TokenVec(256),
.chunks = make_ChunkVec(256),
.regions = make_RegionVec(256),
};
TokenPtrVec line_tok_ptrs = lex(line, &arena);
Token* line_toks = malloc(sizeof(Token) * line_tok_ptrs.count);
for (int i = 0; i < line_tok_ptrs.count; i++) {
line_toks[i] = **get_from_TokenPtrVec(&line_tok_ptrs, i);
}
Pipeline pl = parse_tokstream(line_toks);
ExpandedPipeline exp_pl = expand_pipeline(&pl, shstate);
CommandVec cmds = make_cmd_vec_pl(exp_pl);
run_cmds(cmds);
free(line_toks);
}
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