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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* cmd.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: charles <charles.cabergs@gmail.com> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/06/14 10:41:31 by charles #+# #+# */
/* Updated: 2020/06/14 21:23:20 by charles ### ########.fr */
/* */
/* ************************************************************************** */
#include "eval.h"
#define MS_NO_FD -2
/*
** \brief Wrap a function in a fork
** \param fd_in fork input file descriptor
** \param fd_out fork output file descriptor
** \param passed param of the wrapped function
** \param wrapped function to wrap
*/
int fork_wrap(
int fd_in,
int fd_out,
void *passed,
int (*wrapped)(void *param))
{
int status;
pid_t child_pid;
if ((child_pid = fork()) == -1)
return (-1);
if (child_pid == 0)
{
if (dup2(fd_in, STDIN_FILENO) == -1 ||
dup2(fd_out, STDOUT_FILENO) == -1)
exit(EXIT_FAILURE);
if ((status = wrapped(passed)) == -1)
exit(EXIT_FAILURE);
exit(status);
}
wait(&child_pid);
return (WEXITSTATUS(child_pid));
}
/*
** \brief execve syscall wrapper passed it to fork_wrap
** \param param function params
** \return execve return value
*/
int forked_cmd(void *void_param)
{
t_fork_param_cmd *param;
param = void_param;
if (param->builtin != NULL)
return (param->builtin(param->argv, param->env));
else
return (execve(param->exec_path, param->argv, (char**)param->env->data));
}
int open_redirection(t_ftlst *filename_tokens, t_env env, int oflag)
{
// check in and out (single string)
// argv[0]: [string]: ambiguous redirect code 1
// check in and out (exist)
// argv[0]: [string]: No such file or directory (probably from errno)
char *filename;
int fd;
if (filename_tokens == NULL)
return (MS_NO_FD);
if ((filename = preprocess_filename(filename_tokens, env)) == NULL)
return (-1);
if ((fd = open(filename, oflag)) == -1)
return (-1); //file error;
return (fd);
}
bool redir_has_tag(t_ftlst *redir, enum e_token_tag tags)
{
return (((t_token*)redir->data)->tag & tags);
}
bool redir_extract(t_ftlst *redirs, t_env env, int *fd_in, int *fd_out)
{
t_ftlst *after;
t_ftlst *curr;
char *filename;
if (redirs == NULL)
return (true);
if (!redir_has_tag(redirs, TAG_REDIR_IN | TAG_REDIR_OUT | TAG_REDIR_APPEND)
|| redirs->next == NULL
|| !redir_has_tag(redirs->next, TAG_STR | TAG_STR_SINGLE | TAG_STR_DOUBLE))
return (false);
curr = redirs->next;
while (curr != NULL && redir_has_tag(curr, TAG_STR | TAG_STR_SINGLE | TAG_STR_DOUBLE))
{
if (curr->next == NULL || redir_has_tag(curr->next, TAG_REDIR_IN | TAG_REDIR_OUT | TAG_REDIR_APPEND))
{
after = curr->next;
curr->next = NULL;
}
curr = curr->next;
}
filename = preprocess_filename(redirs->next, env);
if (redir_has_tag(redirs, TAG_REDIR_IN))
{
if (*fd_in != STDIN_FILENO)
close(*fd_in);
if ((*fd_in = open(filename, O_RDONLY)) == -1)
return (false);
}
else if (redir_has_tag(redirs, TAG_REDIR_OUT | TAG_REDIR_APPEND))
{
if (*fd_out != STDOUT_FILENO)
close(*fd_out);
if ((*fd_out = open(filename,
(redir_has_tag(redirs, TAG_REDIR_APPEND) ? O_APPEND : O_WRONLY)
| O_CREAT | O_TRUNC, 0644)) == -1)
return (false);
}
return (redir_extract(after, env, fd_in, fd_out));
}
int eval_cmd(t_env env, t_path path, t_ast *ast)
{
t_fork_param_cmd param;
int fd_in;
int fd_out;
char **argv;
fd_in = STDIN_FILENO;
fd_out = STDOUT_FILENO;
if (!redir_extract(ast->redirs, env, &fd_in, &fd_out))
return (-1);
argv = preprocess(ast->cmd_argv, env);
param.builtin = builtin_search_func(argv[0]);
if (param.builtin == NULL)
{
param.exec_path = exec_search_path(path, env_search(env, "PATH"), argv[0]);
/* // get cmd path */
/* // argv[0]: [string]: command not found code 127 */
if (param.exec_path == NULL)
return (-1); //not_found;
}
param.argv = argv;
param.env = env;
return (fork_wrap(fd_in, fd_out, ¶m, &forked_cmd));
}
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