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1175 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2006 Jakub Jermar
3148 svoboda 3
 * Copyright (c) 2008 Jiri Svoboda
1175 jermar 4
 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1653 cejka 28
 */
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1866 jermar 30
/** @addtogroup libc
1653 cejka 31
 * @{
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 */
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/** @file
1175 jermar 34
 */
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#include <task.h>
3004 svoboda 37
#include <ipc/ipc.h>
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#include <ipc/loader.h>
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#include <libc.h>
3148 svoboda 40
#include <string.h>
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#include <stdlib.h>
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#include <async.h>
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#include <errno.h>
3403 svoboda 44
#include <vfs/vfs.h>
1175 jermar 45
 
1228 jermar 46
task_id_t task_get_id(void)
1175 jermar 47
{
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    task_id_t task_id;
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1228 jermar 50
    (void) __SYSCALL1(SYS_TASK_GET_ID, (sysarg_t) &task_id);
1175 jermar 51
 
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    return task_id;
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}
1653 cejka 54
 
3004 svoboda 55
static int task_spawn_loader(void)
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{
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    int phone_id, rc;
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3203 svoboda 59
    rc = __SYSCALL1(SYS_PROGRAM_SPAWN_LOADER, (sysarg_t) &phone_id);
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    if (rc != 0)
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        return rc;
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63
    return phone_id;
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}
3148 svoboda 65
 
3174 svoboda 66
static int loader_set_args(int phone_id, const char *argv[])
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{
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    aid_t req;
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    ipc_call_t answer;
3202 svoboda 70
    ipcarg_t rc;
3174 svoboda 71
 
72
    const char **ap;
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    char *dp;
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    char *arg_buf;
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    size_t buffer_size;
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    size_t len;
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78
    /*
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     * Serialize the arguments into a single array. First
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     * compute size of the buffer needed.
81
     */
82
    ap = argv;
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    buffer_size = 0;
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    while (*ap != NULL) {
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        buffer_size += strlen(*ap) + 1;
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        ++ap;
87
    }
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89
    arg_buf = malloc(buffer_size);
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    if (arg_buf == NULL) return ENOMEM;
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92
    /* Now fill the buffer with null-terminated argument strings */
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    ap = argv;
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    dp = arg_buf;
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    while (*ap != NULL) {
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        strcpy(dp, *ap);
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        dp += strlen(*ap) + 1;
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99
        ++ap;
100
    }
101
 
102
    /* Send serialized arguments to the loader */
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104
    req = async_send_0(phone_id, LOADER_SET_ARGS, &answer);
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    rc = ipc_data_write_start(phone_id, (void *)arg_buf, buffer_size);
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    if (rc != EOK) {
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        async_wait_for(req, NULL);
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        return rc;
109
    }
110
 
111
    async_wait_for(req, &rc);
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    if (rc != EOK) return rc;
113
 
114
    /* Free temporary buffer */
115
    free(arg_buf);
116
 
117
    return EOK;
118
}
119
 
3148 svoboda 120
/** Create a new task by running an executable from VFS.
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 *
122
 * @param path  pathname of the binary to execute
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 * @param argv  command-line arguments
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 * @return  ID of the newly created task or zero on error.
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 */
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task_id_t task_spawn(const char *path, const char *argv[])
3004 svoboda 127
{
128
    int phone_id;
129
    ipc_call_t answer;
130
    aid_t req;
131
    int rc;
3216 svoboda 132
    ipcarg_t retval;
3148 svoboda 133
 
3403 svoboda 134
    char *pa;
135
    size_t pa_len;
136
 
137
    pa = absolutize(path, &pa_len);
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    if (!pa)
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        return 0;
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3148 svoboda 141
    /* Spawn a program loader */   
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    phone_id = task_spawn_loader();
3403 svoboda 143
    if (phone_id < 0)
144
        return 0;
3004 svoboda 145
 
3148 svoboda 146
    /*
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     * Say hello so that the loader knows the incoming connection's
148
     * phone hash.
149
     */
150
    rc = async_req_0_0(phone_id, LOADER_HELLO);
3403 svoboda 151
    if (rc != EOK)
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        return 0;
3004 svoboda 153
 
3148 svoboda 154
    /* Send program pathname */
155
    req = async_send_0(phone_id, LOADER_SET_PATHNAME, &answer);
3403 svoboda 156
    rc = ipc_data_write_start(phone_id, (void *)pa, pa_len);
3004 svoboda 157
    if (rc != EOK) {
3148 svoboda 158
        async_wait_for(req, NULL);
3004 svoboda 159
        return 1;
160
    }
161
 
3216 svoboda 162
    async_wait_for(req, &retval);
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    if (retval != EOK)
164
        goto error;
3004 svoboda 165
 
3174 svoboda 166
    /* Send arguments */
167
    rc = loader_set_args(phone_id, argv);
3403 svoboda 168
    if (rc != EOK)
169
        goto error;
3174 svoboda 170
 
3148 svoboda 171
    /* Request loader to start the program */  
172
    rc = async_req_0_0(phone_id, LOADER_RUN);
3403 svoboda 173
    if (rc != EOK)
174
        goto error;
3004 svoboda 175
 
3174 svoboda 176
    /* Success */
3148 svoboda 177
    ipc_hangup(phone_id);
3174 svoboda 178
    return 1;
3148 svoboda 179
 
3174 svoboda 180
    /* Error exit */
181
error:
182
    ipc_hangup(phone_id);
183
    return 0;
3004 svoboda 184
}
185
 
1866 jermar 186
/** @}
1653 cejka 187
 */