write_or_die.c

   1 #include "cache.h"
   2
   3 int read_in_full(int fd, void *buf, size_t count)
   4 {
   5         char *p = buf;
   6         ssize_t total = 0;
   7
   8         while (count > 0) {
   9                 ssize_t loaded = xread(fd, p, count);
  10                 if (loaded <= 0)
  11                         return total ? total : loaded;
  12                 count -= loaded;
  13                 p += loaded;
  14                 total += loaded;
  15         }
  16
  17         return total;
  18 }
  19
  20 int write_in_full(int fd, const void *buf, size_t count)
  21 {
  22         const char *p = buf;
  23         ssize_t total = 0;
  24
  25         while (count > 0) {
  26                 ssize_t written = xwrite(fd, p, count);
  27                 if (written < 0)
  28                         return -1;
  29                 if (!written) {
  30                         errno = ENOSPC;
  31                         return -1;
  32                 }
  33                 count -= written;
  34                 p += written;
  35                 total += written;
  36         }
  37
  38         return total;
  39 }
  40
  41 void write_or_die(int fd, const void *buf, size_t count)
  42 {
  43         if (write_in_full(fd, buf, count) < 0) {
  44                 if (errno == EPIPE)
  45                         exit(0);
  46                 die("write error (%s)", strerror(errno));
  47         }
  48 }
  49
  50 int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg)
  51 {
  52         if (write_in_full(fd, buf, count) < 0) {
  53                 if (errno == EPIPE)
  54                         exit(0);
  55                 fprintf(stderr, "%s: write error (%s)\n",
  56                         msg, strerror(errno));
  57                 return 0;
  58         }
  59
  60         return 1;
  61 }
  62
  63 int write_or_whine(int fd, const void *buf, size_t count, const char *msg)
  64 {
  65         if (write_in_full(fd, buf, count) < 0) {
  66                 fprintf(stderr, "%s: write error (%s)\n",
  67                         msg, strerror(errno));
  68                 return 0;
  69         }
  70
  71         return 1;
  72 }