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Diffstat (limited to 'src/parse.y')
| -rw-r--r-- | src/parse.y | 269 |
1 files changed, 269 insertions, 0 deletions
diff --git a/src/parse.y b/src/parse.y new file mode 100644 index 0000000..8c7ae24 --- /dev/null +++ b/src/parse.y @@ -0,0 +1,269 @@ +/* + * Copyright IBM Corporation. 2007 + * + * Authors: Balbir Singh <balbir@linux.vnet.ibm.com> + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2.1 of the GNU Lesser General Public License + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it would be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + * + * NOTE: The grammar has been modified, not to be the most efficient, but + * to allow easy updation of internal data structures. + */ +%{ +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <libcgroup.h> +#include <libcgroup-internal.h> + +int yylex(void); +extern int line_no; +extern char *yytext; + +void yyerror(char *s) +{ + fprintf(stderr, "error at line number %d at %c:%s", line_no, *yytext, + s); +} + +int yywrap(void) +{ + return 1; +} + +%} + +%token ID MOUNT GROUP PERM TASK ADMIN + +%union { + char *name; + char chr; + int val; +} +%type <name> ID namevalue_conf +%type <val> mountvalue_conf mount task_namevalue_conf admin_namevalue_conf +%type <val> admin_conf task_conf task_or_admin group_conf group start +%start start +%% + +start : start group + { + $$ = $1; + } + | start mount + { + $$ = $1; + } + | + { + $$ = 1; + } + ; + +group : GROUP ID '{' group_conf '}' + { + $$ = $4; + if ($$) + cgroup_config_insert_cgroup($2); + else { + fprintf(stderr, "parsing failed at line number %d\n", + line_no); + $$ = 0; + return $$; + } + } + ; + +group_conf + : ID '{' namevalue_conf '}' + { + $$ = cgroup_config_parse_controller_options($1, $3); + if (!$$) { + fprintf(stderr, "parsing failed at line number %d\n", + line_no); + $$ = 0; + return $$; + } + } + | group_conf ID '{' namevalue_conf '}' + { + $$ = cgroup_config_parse_controller_options($2, $4); + if (!$$) { + fprintf(stderr, "parsing failed at line number %d\n", + line_no); + $$ = 0; + return $$; + } + } + | PERM '{' task_or_admin '}' + { + $$ = $3; + if (!$$) { + fprintf(stderr, "parsing failed at line number %d\n", + line_no); + $$ = 0; + return $$; + } + } + ; + +namevalue_conf + : ID '=' ID ';' + { + $1 = realloc($1, strlen($1) + strlen($3) + 2); + $1 = strncat($1, " ", strlen(" ")); + $$ = strncat($1, $3, strlen($3)); + free($3); + } + | namevalue_conf ID '=' ID ';' + { + int len = 0; + if ($1) + len = strlen($1); + $2 = realloc($2, len + strlen($2) + strlen($4) + 3); + $2 = strncat($2, " ", strlen(" ")); + $$ = strncat($2, $4, strlen($4)); + if ($1) { + $2 = strncat($2, ":", strlen(":")); + $$ = strncat($2, $1, strlen($1)); + } + free($4); + } + | + { + $$ = NULL; + } + ; + +task_namevalue_conf + : ID '=' ID ';' + { + $$ = cgroup_config_group_task_perm($1, $3); + if (!$$) { + fprintf(stderr, "parsing failed at line number %d\n", + line_no); + $$ = 0; + return $$; + } + } + | task_namevalue_conf ID '=' ID ';' + { + $$ = $1 && cgroup_config_group_task_perm($2, $4); + if (!$$) { + fprintf(stderr, "parsing failed at line number %d\n", + line_no); + $$ = 0; + return $$; + } + } + ; + +admin_namevalue_conf + : ID '=' ID ';' + { + $$ = cgroup_config_group_admin_perm($1, $3); + if (!$$) { + fprintf(stderr, "parsing failed at line number %d\n", + line_no); + $$ = 0; + return $$; + } + } + | admin_namevalue_conf ID '=' ID ';' + { + $$ = $1 && cgroup_config_group_admin_perm($2, $4); + if (!$$) { + fprintf(stderr, "parsing failed at line number %d\n", + line_no); + $$ = 0; + return $$; + } + } + ; + +task_or_admin + : TASK '{' task_namevalue_conf '}' admin_conf + { + $$ = $3 && $5; + if (!$$) { + fprintf(stderr, "parsing failed at line number %d\n", + line_no); + $$ = 0; + return $$; + } + } + | ADMIN '{' admin_namevalue_conf '}' task_conf + { + $$ = $3 && $5; + if (!$$) { + fprintf(stderr, "parsing failed at line number %d\n", + line_no); + $$ = 0; + return $$; + } + } + ; + +admin_conf: ADMIN '{' admin_namevalue_conf '}' + { + $$ = $3; + if (!$$) { + fprintf(stderr, "parsing failed at line number %d\n", + line_no); + $$ = 0; + return $$; + } + } + ; + +task_conf: TASK '{' task_namevalue_conf '}' + { + $$ = $3; + if (!$$) { + fprintf(stderr, "parsing failed at line number %d\n", + line_no); + $$ = 0; + return $$; + } + } + ; + +mountvalue_conf + : ID '=' ID ';' + { + if (!cgroup_config_insert_into_mount_table($1, $3)) { + cgroup_config_cleanup_mount_table(); + $$ = 0; + return $$; + } + $$ = 1; + } + | mountvalue_conf ID '=' ID ';' + { + if (!cgroup_config_insert_into_mount_table($2, $4)) { + cgroup_config_cleanup_mount_table(); + $$ = 0; + return $$; + } + $$ = 1; + } + ; + +mount : MOUNT '{' mountvalue_conf '}' + { + $$ = $3; + if (!$$) { + fprintf(stderr, "parsing failed at line number %d\n", + line_no); + $$ = 0; + return $$; + } + } + ; + + +%% |