src/osdep/generic.h

   1 /* This is... er, the OS-independent part of osdep/ ;-). */
   2
   3 #ifndef EL__OSDEP_GENERIC_H
   4 #define EL__OSDEP_GENERIC_H
   5
   6 #ifdef HAVE_LIMITS_H
   7 #include <limits.h> /* may contain PIPE_BUF definition on some systems */
   8 #endif
   9
  10 #ifdef HAVE_SYS_SIGNAL_H
  11 #include <sys/signal.h> /* may contain SA_RESTART */
  12 #endif
  13
  14 #ifdef HAVE_STDDEF_H
  15 #include <stddef.h> /* may contain offsetof() */
  16 #endif
  17
  18 #ifndef SA_RESTART
  19 #define SA_RESTART      0
  20 #endif
  21
  22 #ifndef PIPE_BUF
  23 #define PIPE_BUF        512 /* POSIX says that. -- Mikulas */
  24 #endif
  25
  26 /* These are not available on some IRIX systems. */
  27 #ifndef INET_ADDRSTRLEN
  28 #define INET_ADDRSTRLEN 16
  29 #endif
  30 #ifndef INET6_ADDRSTRLEN
  31 #define INET6_ADDRSTRLEN 46
  32 #endif
  33
  34 #ifdef CONFIG_IPV6
  35 #define IP_ADDRESS_BUFFER_SIZE INET6_ADDRSTRLEN
  36 #else
  37 #define IP_ADDRESS_BUFFER_SIZE INET_ADDRSTRLEN
  38 #endif
  39
  40 #ifndef PF_INET
  41 #define PF_INET AF_INET
  42 #endif
  43
  44 #ifndef PF_INET6
  45 #define PF_INET6 AF_INET6
  46 #endif
  47
  48 /* Attempt to workaround the EINTR mess. */
  49 #if defined(EINTR) && !defined(CONFIG_OS_WIN32)
  50
  51 #ifdef TEMP_FAILURE_RETRY       /* GNU libc */
  52 #define safe_read(fd, buf, count) TEMP_FAILURE_RETRY(read(fd, buf, count))
  53 #define safe_write(fd, buf, count) TEMP_FAILURE_RETRY(write(fd, buf, count))
  54 #else /* TEMP_FAILURE_RETRY */
  55
  56 #ifdef HAVE_UNISTD_H
  57 #include <unistd.h>
  58 #endif
  59
  60 static inline ssize_t
  61 safe_read(int fd, void *buf, size_t count) {
  62         do {
  63                 ssize_t r = read(fd, buf, count);
  64
  65                 if (r == -1 && errno == EINTR) continue;
  66                 return r;
  67         } while (1);
  68 }
  69
  70 static inline ssize_t
  71 safe_write(int fd, const void *buf, size_t count) {
  72         do {
  73                 ssize_t w = write(fd, buf, count);
  74
  75                 if (w == -1 && errno == EINTR) continue;
  76                 return w;
  77         } while (1);
  78 }
  79 #endif /* TEMP_FAILURE_RETRY */
  80
  81 #else /* EINTR && !CONFIG_OS_WIN32 */
  82
  83 #define safe_read(fd, buf, count) read(fd, buf, count)
  84 #define safe_write(fd, buf, count) write(fd, buf, count)
  85
  86 #endif /* EINTR && !CONFIG_OS_WIN32 */
  87
  88 #ifndef HAVE_FTELLO
  89 #define ftello(stream) ftell(stream)
  90 #endif
  91
  92 #ifndef HAVE_FSEEKO
  93 #define fseeko(stream, offset, whence) fseek(stream, offset, whence)
  94 #endif
  95
  96 /* Compiler area: */
  97
  98 /* Some compilers, like SunOS4 cc, don't have offsetof in <stddef.h>.  */
  99 #ifndef offsetof
 100 #define offsetof(type, ident) ((size_t) &(((type *) 0)->ident))
 101 #endif
 102
 103 /* Alignment of types.  */
 104 #define alignof(TYPE) \
 105     offsetof(struct { unsigned char dummy1; TYPE dummy2; }, dummy2)
 106
 107 /* Using this macro to copy structs is both faster and safer than
 108  * memcpy(destination, source, sizeof(source)). Please, use this macro instead
 109  * of memcpy(). */
 110 #define copy_struct(destination, source) \
 111         do { (*(destination) = *(source)); } while (0)
 112
 113 #define sizeof_array(array) (sizeof(array)/sizeof(*(array)))
 114
 115 #endif