source: mainline/uspace/lib/c/generic/task.c@ b538ca5c

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since b538ca5c was 3815efb, checked in by Martin Decky <martin@…>, 14 years ago

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1/*
2 * Copyright (c) 2006 Jakub Jermar
3 * Copyright (c) 2008 Jiri Svoboda
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * - Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * - Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * - The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30/** @addtogroup libc
31 * @{
32 */
33/** @file
34 */
35
36#include <task.h>
37#include <loader/loader.h>
38#include <stdarg.h>
39#include <str.h>
40#include <ipc/ns.h>
41#include <macros.h>
42#include <assert.h>
43#include <async.h>
44#include <errno.h>
45#include <malloc.h>
46#include <libc.h>
47#include "private/ns.h"
48
49task_id_t task_get_id(void)
50{
51#ifdef __32_BITS__
52 task_id_t task_id;
53 (void) __SYSCALL1(SYS_TASK_GET_ID, (sysarg_t) &task_id);
54
55 return task_id;
56#endif /* __32_BITS__ */
57
58#ifdef __64_BITS__
59 return (task_id_t) __SYSCALL0(SYS_TASK_GET_ID);
60#endif /* __64_BITS__ */
61}
62
63/** Set the task name.
64 *
65 * @param name The new name, typically the command used to execute the
66 * program.
67 *
68 * @return Zero on success or negative error code.
69 */
70int task_set_name(const char *name)
71{
72 assert(name);
73
74 return __SYSCALL2(SYS_TASK_SET_NAME, (sysarg_t) name, str_size(name));
75}
76
77/** Kill a task.
78 *
79 * @param task_id ID of task to kill.
80 *
81 * @return Zero on success or negative error code.
82 */
83
84int task_kill(task_id_t task_id)
85{
86 return (int) __SYSCALL1(SYS_TASK_KILL, (sysarg_t) &task_id);
87}
88
89/** Create a new task by running an executable from the filesystem.
90 *
91 * This is really just a convenience wrapper over the more complicated
92 * loader API. Arguments are passed as a null-terminated array of strings.
93 *
94 * @param id If not NULL, the ID of the task is stored here on success.
95 * @param path Pathname of the binary to execute.
96 * @param argv Command-line arguments.
97 *
98 * @return Zero on success or negative error code.
99 *
100 */
101int task_spawnv(task_id_t *id, const char *path, const char *const args[])
102{
103 /* Send default files */
104 fdi_node_t *files[4];
105 fdi_node_t stdin_node;
106 fdi_node_t stdout_node;
107 fdi_node_t stderr_node;
108
109 if ((stdin != NULL) && (fnode(stdin, &stdin_node) == EOK))
110 files[0] = &stdin_node;
111 else
112 files[0] = NULL;
113
114 if ((stdout != NULL) && (fnode(stdout, &stdout_node) == EOK))
115 files[1] = &stdout_node;
116 else
117 files[1] = NULL;
118
119 if ((stderr != NULL) && (fnode(stderr, &stderr_node) == EOK))
120 files[2] = &stderr_node;
121 else
122 files[2] = NULL;
123
124 files[3] = NULL;
125
126 return task_spawnvf(id, path, args, files);
127}
128
129/** Create a new task by running an executable from the filesystem.
130 *
131 * This is really just a convenience wrapper over the more complicated
132 * loader API. Arguments are passed as a null-terminated array of strings.
133 * Files are passed as null-terminated array of pointers to fdi_node_t.
134 *
135 * @param id If not NULL, the ID of the task is stored here on success.
136 * @param path Pathname of the binary to execute.
137 * @param argv Command-line arguments.
138 * @param files Standard files to use.
139 *
140 * @return Zero on success or negative error code.
141 *
142 */
143int task_spawnvf(task_id_t *id, const char *path, const char *const args[],
144 fdi_node_t *const files[])
145{
146 /* Connect to a program loader. */
147 loader_t *ldr = loader_connect();
148 if (ldr == NULL)
149 return EREFUSED;
150
151 /* Get task ID. */
152 task_id_t task_id;
153 int rc = loader_get_task_id(ldr, &task_id);
154 if (rc != EOK)
155 goto error;
156
157 /* Send spawner's current working directory. */
158 rc = loader_set_cwd(ldr);
159 if (rc != EOK)
160 goto error;
161
162 /* Send program pathname. */
163 rc = loader_set_pathname(ldr, path);
164 if (rc != EOK)
165 goto error;
166
167 /* Send arguments. */
168 rc = loader_set_args(ldr, args);
169 if (rc != EOK)
170 goto error;
171
172 /* Send files */
173 rc = loader_set_files(ldr, files);
174 if (rc != EOK)
175 goto error;
176
177 /* Load the program. */
178 rc = loader_load_program(ldr);
179 if (rc != EOK)
180 goto error;
181
182 /* Run it. */
183 rc = loader_run(ldr);
184 if (rc != EOK)
185 goto error;
186
187 /* Success */
188 if (id != NULL)
189 *id = task_id;
190
191 return EOK;
192
193error:
194 /* Error exit */
195 loader_abort(ldr);
196 return rc;
197}
198
199/** Create a new task by running an executable from the filesystem.
200 *
201 * This is really just a convenience wrapper over the more complicated
202 * loader API. Arguments are passed as a null-terminated list of arguments.
203 *
204 * @param id If not NULL, the ID of the task is stored here on success.
205 * @param path Pathname of the binary to execute.
206 * @param ... Command-line arguments.
207 *
208 * @return Zero on success or negative error code.
209 *
210 */
211int task_spawnl(task_id_t *task_id, const char *path, ...)
212{
213 /* Count the number of arguments. */
214
215 va_list ap;
216 const char *arg;
217 const char **arglist;
218 int cnt = 0;
219
220 va_start(ap, path);
221 do {
222 arg = va_arg(ap, const char *);
223 cnt++;
224 } while (arg != NULL);
225 va_end(ap);
226
227 /* Allocate argument list. */
228 arglist = malloc(cnt * sizeof(const char *));
229 if (arglist == NULL)
230 return ENOMEM;
231
232 /* Fill in arguments. */
233 cnt = 0;
234 va_start(ap, path);
235 do {
236 arg = va_arg(ap, const char *);
237 arglist[cnt++] = arg;
238 } while (arg != NULL);
239 va_end(ap);
240
241 /* Spawn task. */
242 int rc = task_spawnv(task_id, path, arglist);
243
244 /* Free argument list. */
245 free(arglist);
246 return rc;
247}
248
249int task_wait(task_id_t id, task_exit_t *texit, int *retval)
250{
251 assert(texit);
252 assert(retval);
253
254 async_exch_t *exch = async_exchange_begin(session_ns);
255 sysarg_t te, rv;
256 int rc = (int) async_req_2_2(exch, NS_TASK_WAIT, LOWER32(id),
257 UPPER32(id), &te, &rv);
258 async_exchange_end(exch);
259
260 *texit = te;
261 *retval = rv;
262
263 return rc;
264}
265
266int task_retval(int val)
267{
268 async_exch_t *exch = async_exchange_begin(session_ns);
269 int rc = (int) async_req_1_0(exch, NS_RETVAL, val);
270 async_exchange_end(exch);
271
272 return rc;
273}
274
275/** @}
276 */
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