74 lines
1.4 KiB
C
74 lines
1.4 KiB
C
/* This module should be dynamically loaded with enable -f
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* which would create a new builtin named mypid. You'll need
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* the source code for GNU bash to recompile this module.
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*
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* Then, from within bash, enable -f ./mypid enable_mypid, where ./mypid
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* is the binary obtained from running make. Hereafter, `${MYPID}'
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* is a shell builtin variable.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include "builtins.h"
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#include "shell.h"
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#define INIT_DYNAMIC_VAR(var, val, gfunc, afunc) \
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do \
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{ SHELL_VAR *v = bind_variable (var, (val), 0); \
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v->dynamic_value = gfunc; \
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v->assign_func = afunc; \
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} \
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while (0)
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static SHELL_VAR *
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assign_mypid (
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SHELL_VAR *self,
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char *value,
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arrayind_t unused,
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char *key )
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{
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return (self);
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}
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static SHELL_VAR *
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get_mypid (SHELL_VAR *var)
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{
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int rv;
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char *p;
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rv = getpid();
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p = itos (rv);
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FREE (value_cell (var));
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VSETATTR (var, att_integer);
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var_setvalue (var, p);
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return (var);
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}
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int
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enable_mypid_builtin(WORD_LIST *list)
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{
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INIT_DYNAMIC_VAR ("MYPID", (char *)NULL, get_mypid, assign_mypid);
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return 0;
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}
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char const *enable_mypid_doc[] = {
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"Enable $MYPID.",
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"",
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"Enables use of the ${MYPID} dynamic variable. ",
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"It will yield the current pid of a subshell.",
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(char *)0
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};
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struct builtin enable_mypid_struct = {
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"enable_mypid",
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enable_mypid_builtin,
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BUILTIN_ENABLED,
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(char**)(void*)enable_mypid_doc,
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"enable_mypid N",
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0
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};
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