src/osdep/generic.h

   1
   2 /* This is... er, the OS-independent part of osdep/ ;-). */
   3
   4 #ifndef EL__OSDEP_GENERIC_H
   5 #define EL__OSDEP_GENERIC_H
   6
   7 #ifdef HAVE_LIMITS_H
   8 #include <limits.h> /* may contain PIPE_BUF definition on some systems */
   9 #endif
  10
  11 #ifdef HAVE_SYS_SIGNAL_H
  12 #include <sys/signal.h> /* may contain SA_RESTART */
  13 #endif
  14
  15 #ifdef HAVE_STDDEF_H
  16 #include <stddef.h> /* may contain offsetof() */
  17 #endif
  18
  19 #ifndef SA_RESTART
  20 #define SA_RESTART      0
  21 #endif
  22
  23 #ifndef PIPE_BUF
  24 #define PIPE_BUF        512 /* POSIX says that. -- Mikulas */
  25 #endif
  26
  27 /* These are not available on some IRIX systems. */
  28 #ifndef INET_ADDRSTRLEN
  29 #define INET_ADDRSTRLEN 16
  30 #endif
  31 #ifndef INET6_ADDRSTRLEN
  32 #define INET6_ADDRSTRLEN 46
  33 #endif
  34
  35 #ifdef CONFIG_IPV6
  36 #define IP_ADDRESS_BUFFER_SIZE INET6_ADDRSTRLEN
  37 #else
  38 #define IP_ADDRESS_BUFFER_SIZE INET_ADDRSTRLEN
  39 #endif
  40
  41
  42 /* Attempt to workaround the EINTR mess. */
  43 #if defined(EINTR) && !defined(CONFIG_WIN32)
  44
  45 #ifdef TEMP_FAILURE_RETRY       /* GNU libc */
  46 #define safe_read(fd, buf, count) TEMP_FAILURE_RETRY(read(fd, buf, count))
  47 #define safe_write(fd, buf, count) TEMP_FAILURE_RETRY(write(fd, buf, count))
  48 #else /* TEMP_FAILURE_RETRY */
  49
  50 #ifdef HAVE_UNISTD_H
  51 #include <unistd.h>
  52 #endif
  53
  54 static inline ssize_t
  55 safe_read(int fd, void *buf, size_t count) {
  56         do {
  57                 ssize_t r = read(fd, buf, count);
  58
  59                 if (r == -1 && errno == EINTR) continue;
  60                 return r;
  61         } while (1);
  62 }
  63
  64 static inline ssize_t
  65 safe_write(int fd, const void *buf, size_t count) {
  66         do {
  67                 ssize_t w = write(fd, buf, count);
  68
  69                 if (w == -1 && errno == EINTR) continue;
  70                 return w;
  71         } while (1);
  72 }
  73 #endif /* TEMP_FAILURE_RETRY */
  74
  75 #else /* EINTR && !CONFIG_WIN32 */
  76
  77 #define safe_read(fd, buf, count) read(fd, buf, count)
  78 #define safe_write(fd, buf, count) write(fd, buf, count)
  79
  80 #endif /* EINTR && !CONFIG_WIN32 */
  81
  82 #ifndef HAVE_FTELLO
  83 #define ftello(stream) ftell(stream)
  84 #endif
  85
  86 #ifndef HAVE_FSEEKO
  87 #define fseeko(stream, offset, whence) fseek(stream, offset, whence)
  88 #endif
  89
  90 /* Compiler area: */
  91
  92 /* Some compilers, like SunOS4 cc, don't have offsetof in <stddef.h>.  */
  93 #ifndef offsetof
  94 #define offsetof(type, ident) ((size_t) &(((type *) 0)->ident))
  95 #endif
  96
  97 /* Alignment of types.  */
  98 #define alignof(TYPE) \
  99     ((int) &((struct { unsigned char dummy1; TYPE dummy2; } *) 0)->dummy2)
 100
 101 /* Using this macro to copy structs is both faster and safer than
 102  * memcpy(destination, source, sizeof(source)). Please, use this macro instead
 103  * of memcpy(). */
 104 #define copy_struct(destination, source) \
 105         do { (*(destination) = *(source)); } while (0)
 106
 107 #define sizeof_array(array) (sizeof(array)/sizeof(*(array)))
 108
 109 #endif