42/42_SIDE_exam_04_microshell
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cd builtin ok

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hugogogo
2022-06-27 22:41:14 +02:00
parent 14130caef7
commit 078dba820d
4 changed files with 39 additions and 22 deletions
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microshell.c
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@@ -1,4 +1,4 @@
#include <unistd.h> // write, fork, execve, pipe #include <unistd.h> // write, fork, execve, pipe, chdir
#include <stdio.h> // printf #include <stdio.h> // printf
#include <string.h> // strcmp #include <string.h> // strcmp
#include <sys/types.h> // pid_t #include <sys/types.h> // pid_t
@@ -8,36 +8,37 @@
#define STDOUT 1 #define STDOUT 1
#define STDERR 2 #define STDERR 2
void print_cmd(char **av) typedef enum {FALSE, TRUE} BOOL;
{
int i;
int size;
i = 0; void builtin_cd(char *av)
while (av[i]) {
{ printf("here\n");
size = 0; if (av)
while (av[i][size] != '\0') chdir(av);
size++;
write(1, av[i], size);
write(1, " ", 1);
i++;
}
write(1, "\n", 1);
} }
//void exec_cmd(char **av, int end, char **en) void exec_cmd(char **av, char **en, int fdin, int fdout)
void exec_cmd(char **av, char **en)
{ {
pid_t pid = fork(); pid_t pid = fork();
// av[end] = NULL;
if (pid == 0) // child process if (pid == 0) // child process
{ {
if (fdin != STDIN_FILENO)
{
dup2(fdin, STDIN_FILENO);
close(fdin);
}
if (fdout != STDOUT_FILENO)
{
dup2(fdout, STDOUT_FILENO);
close(fdout);
}
execve(av[0], av, en); execve(av[0], av, en);
} }
else // parent process else // parent process
{ {
if (fdout != STDOUT_FILENO)
close(fdout);
waitpid(pid, NULL, 0); waitpid(pid, NULL, 0);
} }
} }
@@ -46,22 +47,38 @@ int main(int ac, char **av, char **en)
{ {
int i; int i;
int start; int start;
int fds[2];
int old_fdin;
if (ac <= 1) if (ac <= 1)
return (0); return (0);
i = 1; i = 1;
old_fdin = STDIN_FILENO;
fds[STDIN] = STDIN_FILENO;
fds[STDOUT] = STDOUT_FILENO;
while (i < ac) while (i < ac)
{ {
start = i; start = i;
while (i < ac && strcmp(av[i], "|") && strcmp(av[i], ";")) while (i < ac && strcmp(av[i], "|") && strcmp(av[i], ";"))
i++; i++;
if (av[i] && !strcmp(av[i], "|"))
pipe(fds);
av[i] = NULL; av[i] = NULL;
// print_cmd(&av[start]); if (strcmp(av[start], "cd") == 0)
exec_cmd(&av[start], en); builtin_cd(av[start + 1]);
else
exec_cmd(av + start, en, old_fdin, fds[STDOUT]);
if (old_fdin != STDIN_FILENO)
close(old_fdin);
old_fdin = fds[STDIN];
fds[STDOUT] = STDOUT_FILENO;
if (i < ac) if (i < ac)
i++; i++;
} }
return (0); return (0);
} }
// https://www.rozmichelle.com/pipes-forks-dups/ // pipes fork and dups : https://www.rozmichelle.com/pipes-forks-dups/
// subject and example : https://github.com/Glagan/42-exam-rank-04
// lsof -c microshell : https://www.thegeekstuff.com/2012/08/lsof-command-examples/