minix/commands/svrctl/svrctl.c
Thomas Veerman 8dd0880985 Add a simple utility to send control messages
The svrctl utility allows you to send control messages to VFS or PM.
This way you can retrieve runtime information or alter behavior.
2012-04-13 12:58:41 +00:00

118 lines
2.7 KiB
C

#include <sys/svrctl.h>
#include <sys/types.h>
#include <ctype.h>
#include <lib.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static void usage(void);
#define VFS "vfs"
#define PM "pm"
#define SET "set"
#define GET "get"
static char *bin_name;
int main (int argc, char *argv[])
{
int r, param;
endpoint_t proc_e = NONE;
struct sysgetenv sysgetenv;
message m;
char *to_whom, *operation, *what, *value;
unsigned i;
bin_name = argv[0];
if (argc < 4 || argc > 5) usage();
if (geteuid() != 0) {
fprintf(stderr, "You have to be root to run this utility\n");
exit(EXIT_FAILURE);
}
/* Make some parameters lower case to ease comparing */
to_whom = argv[1];
operation = argv[2];
what = argv[3];
for (i = 0; i < strlen(to_whom); ++i) to_whom[i] = tolower(to_whom[i]);
for (i = 0; i < strlen(operation); ++i) operation[i] = tolower(operation[i]);
for (i = 0; i < strlen(what); ++i) what[i] = tolower(what[i]);
if (!strncmp(to_whom, VFS, strlen(VFS)+1)) proc_e = VFS_PROC_NR;
else if (!strncmp(to_whom, PM, strlen(PM)+1)) proc_e = PM_PROC_NR;
else usage();
sysgetenv.key = what;
sysgetenv.keylen = strlen(what) + 1;
if (!strncmp(operation, SET, strlen(SET)+1)) {
if (argc != 5) usage();
value = argv[4];
sysgetenv.val = value;
sysgetenv.vallen = strlen(value) + 1;
if (proc_e == VFS_PROC_NR)
param = VFSSETPARAM;
else if (proc_e == PM_PROC_NR)
param = PMSETPARAM;
else
usage();
m.m2_i1 = param;
m.m2_p1 = (char *) &sysgetenv;
r = _syscall(proc_e, SVRCTL, &m);
if (r != 0) {
if (errno == ESRCH)
fprintf(stderr, "invalid parameter: %s\n", what);
else if (errno == EINVAL)
fprintf(stderr, "invalid value: %s\n", value);
else
perror("");
exit(EXIT_FAILURE);
}
return(EXIT_SUCCESS);
} else if (!strncmp(operation, GET, strlen(GET)+1)) {
char get_param_buffer[4096];
memset(get_param_buffer, '\0', sizeof(get_param_buffer));
sysgetenv.val = get_param_buffer;
sysgetenv.vallen = sizeof(get_param_buffer) - 1;
if (proc_e == VFS_PROC_NR)
param = VFSGETPARAM;
else if (proc_e == PM_PROC_NR)
param = PMGETPARAM;
else
usage();
m.m2_i1 = param;
m.m2_p1 = (char *) &sysgetenv;
r = _syscall(proc_e, SVRCTL, &m);
if (r != 0) {
if (errno == ESRCH)
fprintf(stderr, "invalid parameter: %s\n", what);
else
perror("");
return(EXIT_FAILURE);
} else {
if (sysgetenv.vallen > 0) {
get_param_buffer[sysgetenv.vallen] = '\0';
printf("%s\n", get_param_buffer);
}
}
return(EXIT_SUCCESS);
} else
usage();
return(EXIT_FAILURE);
}
static void usage()
{
fprintf(stderr, "Usage:\n");
fprintf(stderr, " %s <vfs|pm> set <request> <value>\n", bin_name);
fprintf(stderr, " %s <vfs|pm> get <request>\n", bin_name);
exit(EXIT_FAILURE);
}