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141 Kevin 1 
/*
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 * An example plug-in, which implements the 'cd' command.
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 */
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#include <stdbool.h>
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#include <stdio.h>
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#include <pwd.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include "../esh.h"
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#include <signal.h>
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#include "../esh-sys-utils.h"
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static bool
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init_plugin(struct esh_shell *shell)
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{
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    printf("Plugin 'cd' initialized...\n");
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    return true;
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}
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/* Implement chdir built-in.
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 * Returns true if handled, false otherwise. */
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static bool
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chdir_builtin(struct esh_command *cmd)
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{
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    if (strcmp(cmd->argv[0], "cd"))
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        return false;
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    char *dir = cmd->argv[1];
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    // if no argument is given, default to home directory
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    if (dir == NULL) {
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        struct passwd *pw = getpwuid(getuid());
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        if (pw == NULL) {
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            esh_sys_error("Could not obtain home directory.\n"
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                          "getpwuid(%d) failed: ", getuid());
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        } else {
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            dir = pw->pw_dir;
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        }
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    }
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    if (chdir(dir) != 0)
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        esh_sys_error("chdir: ");
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    return true;
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}
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struct esh_plugin esh_module = {
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  .rank = 1,
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  .init = init_plugin,
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  .process_builtin = chdir_builtin
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};