finit-arc/helpers.c

   1
   2 #include <string.h>
   3 #include <limits.h>
   4 #include <stdlib.h>
   5 #include <sys/stat.h>
   6 #include <sys/types.h>
   7 #include <fcntl.h>
   8 #include <unistd.h>
   9 #include <sys/ioctl.h>
  10 #include <sys/socket.h>
  11 #include <net/if.h>
  12 #include <netinet/in.h>
  13 #include <arpa/inet.h>
  14
  15 #ifdef BUILTIN_RUNPARTS
  16 #include <dirent.h>
  17 #include <stdarg.h>
  18 #include <sys/wait.h>
  19 #endif
  20
  21 #include <grp.h>
  22
  23 #include "helpers.h"
  24
  25 /*
  26  * Helpers to replace system() calls
  27  */
  28
  29 int makepath(char *p)
  30 {
  31         char *x, path[PATH_MAX];
  32         int ret;
  33
  34         x = path;
  35
  36         do {
  37                 do { *x++ = *p++; } while (*p && *p != '/');
  38                 *x = 0;
  39                 ret = mkdir(path, 0777);
  40         } while (*p && (*p != '/' || *(p + 1))); /* ignore trailing slash */
  41
  42         return ret;
  43 }
  44
  45 #define BUF_SIZE 4096
  46
  47 void copyfile(char *src, char *dst, int size)
  48 {
  49         char buffer[BUF_SIZE];
  50         int s, d, n;
  51
  52         /* Size == 0 means copy entire file */
  53         if (size == 0)
  54                 size = INT_MAX;
  55
  56         if ((s = open(src, O_RDONLY)) >= 0) {
  57                 if ((d = open(dst, O_WRONLY | O_CREAT, 0644)) >= 0) {
  58                         do {
  59                                 int csize = size > BUF_SIZE ?  BUF_SIZE : size;
  60
  61                                 if ((n = read(s, buffer, csize)) > 0)
  62                                         write(d, buffer, n);
  63                                 size -= csize;
  64                         } while (size > 0 && n == BUF_SIZE);
  65                         close(d);
  66                 }
  67                 close(s);
  68         }
  69 }
  70
  71 #ifdef BUILTIN_RUNPARTS
  72
  73 #define NUM_SCRIPTS 128         /* ought to be enough for anyone */
  74 #define NUM_ARGS 16
  75
  76 static int cmp(const void *s1, const void *s2)
  77 {
  78         return strcmp(*(char **)s1, *(char **)s2);
  79 }
  80
  81 int run_parts(char *dir, ...)
  82 {
  83         DIR *d;
  84         struct dirent *e;
  85         struct stat st;
  86         char *ent[NUM_SCRIPTS];
  87         int i, num = 0, argnum = 1;
  88         char *args[NUM_ARGS];
  89         va_list ap;
  90
  91         if (chdir(dir))
  92                 return -1;
  93
  94         if ((d = opendir(dir)) == NULL)
  95                 return -1;
  96
  97         va_start(ap, dir);
  98         while (argnum < NUM_ARGS && (args[argnum++] = va_arg(ap, char *)));
  99         va_end(ap);
 100
 101         while ((e = readdir(d))) {
 102                 if (e->d_type == DT_REG && stat(e->d_name, &st) == 0) {
 103                         if (st.st_mode & S_IXUSR) {
 104                                 ent[num++] = strdup(e->d_name);
 105                                 if (num >= NUM_SCRIPTS)
 106                                         break;
 107                         }
 108                 }
 109         }
 110
 111         closedir(d);
 112
 113         if (num == 0)
 114                 return 0;
 115
 116         qsort(ent, num, sizeof(char *), cmp);
 117
 118         for (i = 0; i < num; i++) {
 119                 args[0] = ent[i];
 120                 if (!fork()) {
 121                         execv(ent[i], args);
 122                         exit(0);
 123                 }
 124                 wait(NULL);
 125                 free(ent[i]);
 126         }
 127
 128         return 0;
 129 }
 130
 131 int getgroup(char *s)
 132 {
 133         struct group *grp;
 134
 135         if ((grp = getgrnam(s)) == NULL)
 136                 return -1;
 137
 138         return grp->gr_gid;
 139 }
 140
 141 #endif