test/src/fd.c

   1 /* A program to check on open file descriptors. There are some weird options
   2 for running it in Exim testing. If -q is given, make output suitable for
   3 queryprogram. If -f is given, copy the input as for a transport filter. If -s
   4 is given, add extra output from stat(). */
   5
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <sys/types.h>
  10 #include <fcntl.h>
  11 #include <limits.h>
  12 #include <errno.h>
  13 #include <sys/stat.h>
  14 #include <unistd.h>
  15
  16
  17 /* The way of finding out the maximum file descriptor various between OS.
  18 Most have sysconf(), but a few don't. */
  19
  20 #ifdef _SC_OPEN_MAX
  21   #define mac_maxfd (sysconf(_SC_OPEN_MAX) - 1)
  22 #elif defined OPEN_MAX
  23   #define mac_maxfd (OPEN_MAX - 1)
  24 #elif defined NOFILE
  25   #define mac_maxfd (NOFILE - 1)
  26 #else
  27   #define mac_maxfd 255;    /* just in case */
  28 #endif
  29
  30
  31 int main(int argc, char **argv)
  32 {
  33 int fd;
  34 int qpgm = 0;
  35 int filter = 0;
  36 int use_stat = 0;
  37 struct stat statbuf;
  38 char buffer[8192];
  39 char *p = buffer;
  40
  41 while (argc > 1)
  42   {
  43   char *arg = argv[--argc];
  44   if (strcmp(arg, "-q") == 0) qpgm = 1;
  45   if (strcmp(arg, "-f") == 0) filter = 1;
  46   if (strcmp(arg, "-s") == 0) use_stat = 1;
  47   }
  48
  49 if (filter)
  50   {
  51   int len;
  52   while ((len = read(0, buffer, sizeof(buffer))) > 0)
  53     write(1, buffer, len);
  54   }
  55
  56 p += sprintf(p, "max fd = %d\n", (int)mac_maxfd);
  57
  58 for (fd = 0; fd <= mac_maxfd; fd++)
  59   {
  60   int options = fcntl(fd, F_GETFD);
  61   if (options >= 0)
  62     {
  63     int status = fcntl(fd, F_GETFL);
  64     p += sprintf(p, "%3d opt=%d status=%X ", fd, options, status);
  65     switch(status & 3)
  66       {
  67       case 0: p += sprintf(p, "RDONLY");
  68       break;
  69       case 1: p += sprintf(p, "WRONLY");
  70       break;
  71       case 2: p += sprintf(p, "RDWR");
  72       break;
  73       }
  74     if (isatty(fd)) p += sprintf(p, " TTY");
  75     if ((status & 8) != 0) p += sprintf(p, " APPEND");
  76
  77     if (use_stat && fstat(fd, &statbuf) >= 0)
  78       {
  79       p += sprintf(p, " mode=%o uid=%d size=%d", (int)statbuf.st_mode,
  80         (int)statbuf.st_uid, (int)statbuf.st_size);
  81       }
  82
  83     p += sprintf(p, "\n");
  84     }
  85   else if (errno != EBADF)
  86     {
  87     p += sprintf(p, "%3d errno=%d %s\n", fd, errno, strerror(errno));
  88     }
  89   }
  90
  91 if (qpgm)
  92   {
  93   for (p = buffer; *p != 0; p++)
  94     if (*p == '\n') *p = ' ';
  95   printf("ACCEPT DATA=\"%s\"\n", buffer);
  96   }
  97 else printf("%s", buffer);
  98
  99 exit(0);
 100 }
 101
 102 /* End */