HelenOS sources
This source file includes following definitions.
- try_access
- find_command
- try_exec
#include <stdio.h>
#include <stdlib.h>
#include <str.h>
#include <str_error.h>
#include <errno.h>
#include <vfs/vfs.h>
#include "config.h"
#include "util.h"
#include "exec.h"
#include "errors.h"
static errno_t find_command(char *, char **);
static int try_access(const char *);
const char *search_dir[] = { "/app", NULL };
static int try_access(const char *f)
{
int fd;
errno_t rc = vfs_lookup_open(f, WALK_REGULAR, MODE_READ, &fd);
if (rc == EOK) {
vfs_put(fd);
return 0;
} else
return -1;
}
static errno_t find_command(char *cmd, char **found)
{
if (is_path(cmd)) {
if (-1 != try_access(cmd)) {
*found = str_dup(cmd);
return EOK;
}
*found = NULL;
return EOK;
}
*found = (char *)malloc(PATH_MAX);
if (*found == NULL) {
return ENOMEM;
}
size_t i;
size_t cmd_length = str_length(cmd);
for (i = 0; search_dir[i] != NULL; i++) {
if (str_length(search_dir[i]) + cmd_length + 2 > PATH_MAX) {
free(*found);
return ENOMEM;
}
memset(*found, 0, PATH_MAX);
snprintf(*found, PATH_MAX, "%s/%s", search_dir[i], cmd);
if (-1 != try_access(*found)) {
return EOK;
}
}
free(*found);
*found = NULL;
return EOK;
}
unsigned int try_exec(char *cmd, char **argv, iostate_t *io)
{
task_id_t tid;
task_wait_t twait;
task_exit_t texit;
char *tmp;
errno_t rc;
int retval, i;
int file_handles[3] = { -1, -1, -1 };
FILE *files[3];
rc = find_command(cmd, &tmp);
if (rc != EOK) {
cli_error(CL_ENOMEM, "%s: failure executing find_command()", progname);
return 1;
}
if (tmp == NULL) {
cli_error(CL_EEXEC, "%s: Command not found '%s'", progname, cmd);
return 1;
}
files[0] = io->stdin;
files[1] = io->stdout;
files[2] = io->stderr;
for (i = 0; i < 3 && files[i] != NULL; i++) {
vfs_fhandle(files[i], &file_handles[i]);
}
rc = task_spawnvf(&tid, &twait, tmp, (const char **) argv,
file_handles[0], file_handles[1], file_handles[2]);
free(tmp);
if (rc != EOK) {
cli_error(CL_EEXEC, "%s: Cannot spawn `%s' (%s)", progname, cmd,
str_error(rc));
return 1;
}
rc = task_wait(&twait, &texit, &retval);
if (rc != EOK) {
printf("%s: Failed waiting for command (%s)\n", progname,
str_error(rc));
return 1;
} else if (texit != TASK_EXIT_NORMAL) {
printf("%s: Command failed (unexpectedly terminated)\n", progname);
return 1;
} else if (retval != 0) {
printf("%s: Command failed (exit code %d)\n",
progname, retval);
return 1;
}
return 0;
}
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