generic.h

一个很有名的浏览器

/* $Id: generic.h,v 1.19.6.6 2005/05/01 22:49:10 jonas Exp $ */

/* This is... er, the OS-independent part of osdep/ ;-). */

#ifndef EL__OSDEP_GENERIC_H
#define EL__OSDEP_GENERIC_H

#ifdef HAVE_LIMITS_H
#include <limits.h> /* may contain PIPE_BUF definition on some systems */
#endif

#ifdef HAVE_SYS_SIGNAL_H
#include <sys/signal.h> /* may contain SA_RESTART */
#endif

#ifdef HAVE_STDDEF_H
#include <stddef.h> /* may contain offsetof() */
#endif

#ifndef INT_MAX
#ifdef MAXINT
#define INT_MAX MAXINT
#else
/* XXX: We could use util/types.h to determine something useful? --pasky */
#define INT_MAX 0x7fffffff
#endif
#endif

#ifndef LONG_MAX
#ifdef MAXLONG
#define LONG_MAX MAXLONG
#else
/* XXX: We could use util/types.h to determine something useful? --pasky */
#define LONG_MAX 0x7fffffff
#endif
#endif

#ifndef SA_RESTART
#define SA_RESTART	0
#endif

#ifndef PIPE_BUF
#define PIPE_BUF	512 /* POSIX says that. -- Mikulas */
#endif

/* File permission flags not available on win32 systems. */
#ifndef S_ISUID
#define S_ISUID 0004000                 /* set user id on execution */
#endif
#ifndef S_IRGRP
#define S_IRGRP 0000040                 /* R for group */
#endif
#ifndef S_IWGRP
#define S_IWGRP 0000020                 /* W for group */
#endif
#ifndef S_IXGRP
#define S_IXGRP 0000010                 /* X for group */
#endif
#ifndef S_ISGID
#define S_ISGID 0002000                 /* set group id on execution */
#endif
#ifndef S_IROTH
#define S_IROTH 0000004                 /* R for other */
#endif
#ifndef S_IWOTH
#define S_IWOTH 0000002                 /* W for other */
#endif
#ifndef S_IXOTH
#define S_IXOTH 0000001                 /* X for other */
#endif
#ifndef S_ISVTX
#define S_ISVTX  0001000                /* save swapped text even after use */
#endif

/* These are not available on some IRIX systems. */
#ifndef INET_ADDRSTRLEN
#define INET_ADDRSTRLEN 16
#endif
#ifndef INET6_ADDRSTRLEN
#define INET6_ADDRSTRLEN 46
#endif

#ifdef CONFIG_IPV6
#define IP_ADDRESS_BUFFER_SIZE INET6_ADDRSTRLEN
#else
#define IP_ADDRESS_BUFFER_SIZE INET_ADDRSTRLEN
#endif


/* Attempt to workaround the EINTR mess. */
#if defined(EINTR) && !defined(CONFIG_WIN32)

#ifdef TEMP_FAILURE_RETRY	/* GNU libc */
#define safe_read(fd, buf, count) TEMP_FAILURE_RETRY(read(fd, buf, count))
#define safe_write(fd, buf, count) TEMP_FAILURE_RETRY(write(fd, buf, count))
#else /* TEMP_FAILURE_RETRY */

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

static inline ssize_t
safe_read(int fd, void *buf, size_t count) {
	do {
		int r = read(fd, buf, count);

		if (r == -1 && errno == EINTR) continue;
		return r;
	} while (1);
}

static inline ssize_t
safe_write(int fd, const void *buf, size_t count) {
	do {
		int w = write(fd, buf, count);

		if (w == -1 && errno == EINTR) continue;
		return w;
	} while (1);
}
#endif /* TEMP_FAILURE_RETRY */

#else /* EINTR && !CONFIG_WIN32 */

#define safe_read(fd, buf, count) read(fd, buf, count)
#define safe_write(fd, buf, count) write(fd, buf, count)

#endif /* EINTR && !CONFIG_WIN32 */


/* Compiler area: */

/* Some compilers, like SunOS4 cc, don't have offsetof in <stddef.h>.  */
#ifndef offsetof
#define offsetof(type, ident) ((size_t) &(((type *) 0)->ident))
#endif

/* Alignment of types.  */
#define alignof(TYPE) \
    ((int) &((struct { unsigned char dummy1; TYPE dummy2; } *) 0)->dummy2)

/* Using this macro to copy structs is both faster and safer than
 * memcpy(destination, source, sizeof(source)). Please, use this macro instead
 * of memcpy(). */
#define copy_struct(destination, source) \
	do { (*(destination) = *(source)); } while (0)

#endif