| /* pending.c - reusable stuff awaiting review |
| * |
| * new lib entries for stuff in toys/pending |
| */ |
| |
| #include "toys.h" |
| |
| // Execute a callback for each PID that matches a process name from a list. |
| void name_to_pid(char **names, int (*callback)(pid_t pid, char *name)) |
| { |
| DIR *dp; |
| struct dirent *entry; |
| |
| if (!(dp = opendir("/proc"))) perror_exit("opendir"); |
| |
| while ((entry = readdir(dp))) { |
| int fd, n; |
| unsigned u; |
| char *cmd, **curname; |
| |
| if (!(u = atoi(entry->d_name))) continue; |
| sprintf(libbuf, "/proc/%u/cmdline", u); |
| if (!(cmd = readfile(libbuf, libbuf, sizeof(libbuf)))) continue; |
| |
| for (curname = names; *curname; curname++) |
| if (*curname == '/' ? !strcmp(cmd, *curname) |
| : !strcmp(basename(cmd), basename(*curname)) |
| if (!callback(u, *curname)) break; |
| if (*curname) break; |
| } |
| closedir(dp); |
| } |
| |
| /* |
| * used to get the interger value. |
| */ |
| unsigned long get_int_value(const char *numstr, unsigned long lowrange, unsigned long highrange) |
| { |
| unsigned long rvalue = 0; |
| char *ptr; |
| if(*numstr == '-' || *numstr == '+' || isspace(*numstr)) perror_exit("invalid number '%s'", numstr); |
| errno = 0; |
| rvalue = strtoul(numstr, &ptr, 10); |
| if(errno || numstr == ptr) perror_exit("invalid number '%s'", numstr); |
| if(*ptr) perror_exit("invalid number '%s'", numstr); |
| if(rvalue >= lowrange && rvalue <= highrange) return rvalue; |
| else { |
| perror_exit("invalid number '%s'", numstr); |
| return rvalue; //Not reachable; to avoid waring message. |
| } |
| } |
| |
| /* |
| * strcat to mallocated buffer |
| * reallocate if need be |
| */ |
| char *astrcat (char *x, char *y) { |
| char *z; |
| z = x; |
| x = realloc (x, (x ? strlen (x) : 0) + strlen (y) + 1); |
| if (!x) return 0; |
| (z ? strcat : strcpy) (x, y); |
| return x; |
| } |
| |
| /* |
| * astrcat, but die on failure |
| */ |
| char *xastrcat (char *x, char *y) { |
| x = astrcat (x, y); |
| if (!x) error_exit ("xastrcat"); |
| return x; |
| } |
| |
| void daemonize(void) |
| { |
| int fd = open("/dev/null", O_RDWR); |
| if (fd < 0) fd = xcreate("/", O_RDONLY, 0666); |
| |
| pid_t pid = fork(); |
| if (pid < 0) perror_exit("DAEMON: failed to fork"); |
| if (pid) exit(EXIT_SUCCESS); |
| |
| setsid(); |
| dup2(fd, 0); |
| dup2(fd, 1); |
| dup2(fd, 2); |
| if (fd > 2) close(fd); |
| } |