68 lines
1.0 KiB
C
68 lines
1.0 KiB
C
#include <unistd.h> // write, fork, execve, pipe
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#include <stdio.h> // printf
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#include <string.h> // strcmp
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#include <sys/types.h> // pid_t
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#include <sys/wait.h> // waitpid
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#define STDIN 0
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#define STDOUT 1
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#define STDERR 2
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void print_cmd(char **av)
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{
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int i;
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int size;
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i = 0;
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while (av[i])
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{
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size = 0;
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while (av[i][size] != '\0')
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size++;
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write(1, av[i], size);
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write(1, " ", 1);
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i++;
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}
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write(1, "\n", 1);
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}
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//void exec_cmd(char **av, int end, char **en)
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void exec_cmd(char **av, char **en)
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{
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pid_t pid = fork();
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// av[end] = NULL;
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if (pid == 0) // child process
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{
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execve(av[0], av, en);
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}
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else // parent process
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{
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waitpid(pid, NULL, 0);
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}
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}
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int main(int ac, char **av, char **en)
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{
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int i;
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int start;
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if (ac <= 1)
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return (0);
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i = 1;
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while (i < ac)
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{
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start = i;
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while (i < ac && strcmp(av[i], "|") && strcmp(av[i], ";"))
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i++;
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av[i] = NULL;
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// print_cmd(&av[start]);
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exec_cmd(&av[start], en);
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if (i < ac)
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i++;
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}
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return (0);
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}
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// https://www.rozmichelle.com/pipes-forks-dups/
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