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exec.c
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exec.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* exec.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: dcelsa <dcelsa@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2022/03/04 19:57:04 by dcelsa #+# #+# */
/* Updated: 2022/04/11 20:51:19 by dcelsa ### ########.fr */
/* */
/* ************************************************************************** */
#include "minishell.h"
static char *pathdefiner(char *prog, char **env)
{
char **path;
char *bpath;
int acs;
int i;
i = -1;
while (env[++i])
if (ft_strnstr(env[i], "PATH=", ft_strlen("PATH=")))
break ;
if (!ft_strnstr(env[i], "PATH=", -1))
return (NULL);
path = ft_split(env[i] + ft_strlen("PATH="), ':');
i = arrsize(path);
while (--i >= 0)
{
bpath = ft_strjoin(path[i], prog);
acs = access_checker(bpath);
if (!acs && eraser(path))
return (bpath);
free(bpath);
if (acs == -2 && eraser(path))
return (NULL);
}
eraser(path);
return (NULL);
}
static int executor(t_cmd *cmd, char **env, char *prog, t_bool isbuiltin)
{
char **flags;
char *buf;
char *path;
flags = cmdarr(cmd->args);
if (!flags)
return (error_handler(prog, cmd->args->content, -1));
signal(SIGQUIT, SIG_DFL);
if (ft_strchr(flags[0 + isbuiltin], '/'))
{
path = flags[isbuiltin];
flags[isbuiltin] = ft_strrchr(flags[isbuiltin], '/') + 1;
return (error_handler(prog, path, execve(path, flags, env)));
}
buf = ft_strjoin("/", flags[isbuiltin]);
path = pathdefiner(buf, env);
free(buf);
if (!path || !*flags[isbuiltin])
return (cmdnotfound(prog, flags[isbuiltin]));
return (error_handler(prog, flags[isbuiltin], execve(path, flags, env)));
}
static t_bool closefds(t_fds *fds, int leftpfd[2])
{
if (leftpfd && leftpfd[0])
close(leftpfd[0]);
if (leftpfd && leftpfd[1])
close(leftpfd[1]);
if (fds->envfds)
close(((int *)ft_lstlast(fds->envfds)->content)[1]);
return (TRUE);
}
int forker(t_list *curcmd, t_head *head, int rightpfd[2], pid_t *pidsfd)
{
int leftpfd[2];
int strindx;
t_bool isbuiltin;
ft_bzero(leftpfd, sizeof(*leftpfd) * 2);
if (getprevstruct(head->pipe, curcmd))
error_handler(head->prog, NULL, pipe(leftpfd));
if (getprevstruct(head->pipe, curcmd))
forker(getprevstruct(head->pipe, curcmd), head, leftpfd, pidsfd);
strindx = structindex(head->pipe, curcmd);
arghndlr(cmdcast(curcmd)->args, &cmdcast(curcmd)->args, head);
pidsfd[strindx] = error_handler(head->prog, NULL, fork());
if (pidsfd[strindx] && closefds(&head->fds, leftpfd))
return (0);
free(pidsfd);
if (head->fds.envfds)
close(((int *)ft_lstlast(head->fds.envfds)->content)[0]);
rdrhndlr(cmdcast(curcmd), &head->fds, head);
builtinhndlr(cmdcast(curcmd), head, &isbuiltin);
mounter(leftpfd, rightpfd, cmdcast(curcmd)->fd, head->prog);
return (executor(cmdcast(curcmd), cmdarr(head->env), head->prog,
isbuiltin));
}