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/*
* Copyright (C) 2010 Michael Buesch <m@bues.ch>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "util.h"
#include "log.h"
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <errno.h>
void msleep(unsigned int msecs)
{
int err;
struct timespec time;
time.tv_sec = 0;
while (msecs >= 1000) {
time.tv_sec++;
msecs -= 1000;
}
time.tv_nsec = msecs;
time.tv_nsec *= 1000000;
do {
err = nanosleep(&time, &time);
} while (err && errno == EINTR);
if (err) {
fprintf(stderr, "nanosleep() failed with: %s\n",
strerror(errno));
}
}
char * string_strip(char *str)
{
char *start = str;
size_t len;
if (!str)
return NULL;
while (*start != '\0' && isspace(*start))
start++;
len = strlen(start);
while (len && isspace(start[len - 1])) {
start[len - 1] = '\0';
len--;
}
return start;
}
char * string_split(char *str, int (*sep_match)(int c))
{
char c;
if (!str)
return NULL;
for (c = *str; c != '\0'; c = *str) {
if (sep_match(c)) {
*str = '\0';
return str + 1;
}
str++;
}
return NULL;
}
uint_fast8_t tiny_hash(const char *str)
{
uint8_t c, hash = 21;
while ((c = *str++) != '\0')
hash = ((hash << 3) + hash) + c;
return hash;
}
pid_t subprocess_exec(const char *_command)
{
char command_buf[4096] = { };
char *command;
char *argv[32] = { };
unsigned int i;
long err = 0;
pid_t pid;
if (strlen(_command) >= sizeof(command_buf) - 1) {
logerr("subprocess_exec: Command too long");
err = -E2BIG;
goto out;
}
strcpy(command_buf, _command);
command = command_buf;
for (i = 0; i < ARRAY_SIZE(argv) - 1; i++) {
argv[i] = command;
command = string_split(command, isspace);
if (strempty(argv[i])) {
/* Skip empty elements */
argv[i] = NULL;
i--;
}
if (!command)
break;
}
if (command) {
logerr("subprocess_exec: Too many arguments: '%s'\n", _command);
err = -EINVAL;
goto out;
}
if (!argv[0]) {
logerr("subprocess_exec: Too few arguments\n");
err = -EINVAL;
goto out;
}
pid = vfork();
if (pid < 0) {
logerr("subprocess_exec: Failed to fork (%s)\n", strerror(errno));
err = -errno;
goto out;
}
if (pid == 0) { /* Child */
execv(argv[0], argv);
logerr("subprocess_exec: Failed to exec '%s': %s\n",
_command, strerror(errno));
exit(0);
while (1);
}
err = pid;
out:
return err;
}
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