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Added some smallish comments to help folks understand why we have two tables

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of builtins and the reasoning behind it.
This commit is contained in:
Mark Whitley 2000-07-12 23:36:17 +00:00
parent c41e8c840f
commit 37653aaf9c
3 changed files with 15 additions and 6 deletions
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7
lash.c
View File

@ -112,7 +112,9 @@ static int runCommand(struct job newJob, struct jobSet *jobList, int inBg);
static int busy_loop(FILE * input); static int busy_loop(FILE * input);
/* Table of built-in functions */ /* Table of built-in functions (these are non-forking builtins, meaning they
* can change global variables in the parent shell process but they will not
* work with pipes and redirects; 'unset foo | whatever' will not work) */
static struct builtInCommand bltins[] = { static struct builtInCommand bltins[] = {
{"bg", "Resume a job in the background", "bg [%%job]", builtin_fg_bg}, {"bg", "Resume a job in the background", "bg [%%job]", builtin_fg_bg},
{"cd", "Change working directory", "cd [dir]", builtin_cd}, {"cd", "Change working directory", "cd [dir]", builtin_cd},
@ -125,7 +127,8 @@ static struct builtInCommand bltins[] = {
{NULL, NULL, NULL, NULL} {NULL, NULL, NULL, NULL}
}; };
/* Table of built-in functions */ /* Table of forking built-in functions (things that fork cannot change global
* variables in the parent process, such as the current working directory) */
static struct builtInCommand bltins_forking[] = { static struct builtInCommand bltins_forking[] = {
{"env", "Print all environment variables", "env", builtin_env}, {"env", "Print all environment variables", "env", builtin_env},
{"pwd", "Print current directory", "pwd", builtin_pwd}, {"pwd", "Print current directory", "pwd", builtin_pwd},

7
sh.c
View File

@ -112,7 +112,9 @@ static int runCommand(struct job newJob, struct jobSet *jobList, int inBg);
static int busy_loop(FILE * input); static int busy_loop(FILE * input);
/* Table of built-in functions */ /* Table of built-in functions (these are non-forking builtins, meaning they
* can change global variables in the parent shell process but they will not
* work with pipes and redirects; 'unset foo | whatever' will not work) */
static struct builtInCommand bltins[] = { static struct builtInCommand bltins[] = {
{"bg", "Resume a job in the background", "bg [%%job]", builtin_fg_bg}, {"bg", "Resume a job in the background", "bg [%%job]", builtin_fg_bg},
{"cd", "Change working directory", "cd [dir]", builtin_cd}, {"cd", "Change working directory", "cd [dir]", builtin_cd},
@ -125,7 +127,8 @@ static struct builtInCommand bltins[] = {
{NULL, NULL, NULL, NULL} {NULL, NULL, NULL, NULL}
}; };
/* Table of built-in functions */ /* Table of forking built-in functions (things that fork cannot change global
* variables in the parent process, such as the current working directory) */
static struct builtInCommand bltins_forking[] = { static struct builtInCommand bltins_forking[] = {
{"env", "Print all environment variables", "env", builtin_env}, {"env", "Print all environment variables", "env", builtin_env},
{"pwd", "Print current directory", "pwd", builtin_pwd}, {"pwd", "Print current directory", "pwd", builtin_pwd},

7
shell/lash.c
View File

@ -112,7 +112,9 @@ static int runCommand(struct job newJob, struct jobSet *jobList, int inBg);
static int busy_loop(FILE * input); static int busy_loop(FILE * input);
/* Table of built-in functions */ /* Table of built-in functions (these are non-forking builtins, meaning they
* can change global variables in the parent shell process but they will not
* work with pipes and redirects; 'unset foo | whatever' will not work) */
static struct builtInCommand bltins[] = { static struct builtInCommand bltins[] = {
{"bg", "Resume a job in the background", "bg [%%job]", builtin_fg_bg}, {"bg", "Resume a job in the background", "bg [%%job]", builtin_fg_bg},
{"cd", "Change working directory", "cd [dir]", builtin_cd}, {"cd", "Change working directory", "cd [dir]", builtin_cd},
@ -125,7 +127,8 @@ static struct builtInCommand bltins[] = {
{NULL, NULL, NULL, NULL} {NULL, NULL, NULL, NULL}
}; };
/* Table of built-in functions */ /* Table of forking built-in functions (things that fork cannot change global
* variables in the parent process, such as the current working directory) */
static struct builtInCommand bltins_forking[] = { static struct builtInCommand bltins_forking[] = {
{"env", "Print all environment variables", "env", builtin_env}, {"env", "Print all environment variables", "env", builtin_env},
{"pwd", "Print current directory", "pwd", builtin_pwd}, {"pwd", "Print current directory", "pwd", builtin_pwd},