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Can't call system open(), read(), etc.

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@315 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2007-08-28 01:30:19 +00:00
parent 09e2a0cc1e
commit f5afe99329
1 changed files with 96 additions and 21 deletions
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117
arch/sim/src/up_tapdev.c
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@ -70,6 +70,8 @@
# define DEVTAP "/dev/tap0"
#endif /* linux */
extern int lib_rawprintf(const char *format, ...);
/****************************************************************************
* Private Definitions
****************************************************************************/
@ -81,6 +83,12 @@
#define UIP_DRIPADDR2 0
#define UIP_DRIPADDR3 1
#define READ 3
#define WRITE 4
#define OPEN 5
#define IOCTL 54
#define SELECT 82
/****************************************************************************
* Private Types
****************************************************************************/
@ -94,14 +102,81 @@
****************************************************************************/
#ifdef TAPDEV_DEBUG
static int drop = 0;
static int gdrop = 0;
#endif
static int fd;
static int gtapdevfd;
/****************************************************************************
* Private Functions
****************************************************************************/
/* This is REALLY awkward.. we need to compile using the system header files,
* but we can't use any of the libc calls because all of the symbols are
* defined for NuttX (read, write, etc)! So we do hand rolled syscalls
* to get to the Linux functions.
*/
static inline int up_open(const char *filename, int flags, int mode)
{
int result;
__asm__ volatile ("int $0x80" \
: "=a" (result) \
: "0" (OPEN), "b" ((int)(filename)), "c" ((int)(flags)), "d" ((int)(mode)) \
: "memory");
return (int)result;
}
static inline int up_read(int fd, void* buf, size_t count)
{
ssize_t result;
__asm__ volatile ("int $0x80" \
: "=a" (result) \
: "0" (READ), "b" ((int)(fd)), "c" ((int)(buf)), "d" ((int)(count)) \
: "memory");
return (int)result;
}
static inline int up_write(int fd, const void* buf, size_t count)
{
ssize_t result;
__asm__ volatile ("int $0x80" \
: "=a" (result) \
: "0" (WRITE), "b" ((int)(fd)), "c" ((int)(buf)), "d" ((int)(count)) \
: "memory");
return (int)result;
}
static inline int up_ioctl(int fd, unsigned int cmd, unsigned long arg)
{
ssize_t result;
__asm__ volatile ("int $0x80" \
: "=a" (result) \
: "0" (IOCTL), "b" ((int)(fd)), "c" ((int)(cmd)), "d" ((long)(arg)) \
: "memory");
return (int)result;
}
static inline int up_select(int n, fd_set *inp, fd_set *outp, fd_set *exp, struct timeval *tvp)
{
ssize_t result;
__asm__ volatile ("int $0x80" \
: "=a" (result) \
: "0" (SELECT),"b" ((long)(n)),"c" ((long)(inp)), \
"d" ((long)(outp)),"S" ((long)(exp)), "D"((long)tvp) \
: "memory");
return (int)result;
}
/****************************************************************************
* Public Functions
****************************************************************************/
@ -117,10 +192,10 @@ void tapdev_init(void)
{
char buf[1024];
fd = open(DEVTAP, O_RDWR);
if(fd == -1)
gtapdevfd = up_open(DEVTAP, O_RDWR, 0644);
if(gtapdevfd == -1)
{
printf("tapdev: tapdev_init: open");
lib_rawprintf("tapdev: tapdev_init: open");
return;
}
@ -129,16 +204,16 @@ void tapdev_init(void)
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP|IFF_NO_PI;
if (ioctl(fd, TUNSETIFF, (void *) &ifr) < 0)
if (up_ioctl(gtapdevfd, TUNSETIFF, (void *) &ifr) < 0)
{
printf(buf);
lib_rawprintf(buf);
return;
}
}
#endif /* Linux */
snprintf(buf, sizeof(buf), "ifconfig tap0 inet %d.%d.%d.%d",
UIP_DRIPADDR0, UIP_DRIPADDR1, UIP_DRIPADDR2, UIP_DRIPADDR3);
lib_rawprintf(buf, sizeof(buf), "ifconfig tap0 inet %d.%d.%d.%d",
UIP_DRIPADDR0, UIP_DRIPADDR1, UIP_DRIPADDR2, UIP_DRIPADDR3);
system(buf);
}
@ -152,29 +227,29 @@ unsigned int tapdev_read(char *buf, unsigned int buflen)
tv.tv_usec = 1000;
FD_ZERO(&fdset);
FD_SET(fd, &fdset);
FD_SET(gtapdevfd, &fdset);
ret = select(fd + 1, &fdset, NULL, NULL, &tv);
ret = up_select(gtapdevfd + 1, &fdset, NULL, NULL, &tv);
if(ret == 0)
{
return 0;
}
ret = read(fd, buf, buflen);
ret = up_read(gtapdevfd, buf, buflen);
if(ret == -1)
{
printf("tap_dev: tapdev_read: read");
lib_rawprintf("tap_dev: tapdev_read: read");
}
#ifdef TAPDEV_DEBUG
printf("tap_dev: tapdev_read: read %d bytes\n", ret);
lib_rawprintf("tap_dev: tapdev_read: read %d bytes\n", ret);
{
int i;
for(i = 0; i < 20; i++)
{
printf("%x ", buf[i]);
lib_rawprintf("%x ", buf[i]);
}
printf("\n");
lib_rawprintf("\n");
}
#endif
@ -185,17 +260,17 @@ void tapdev_send(char *buf, unsigned int buflen)
{
int ret;
#ifdef TAPDEV_DEBUG
printf("tapdev_send: sending %d bytes\n", buflen);
lib_rawprintf("tapdev_send: sending %d bytes\n", buflen);
drop++;
if(drop % 8 == 7)
gdrop++;
if(gdrop % 8 == 7)
{
printf("Dropped a packet!\n");
lib_rawprintf("Dropped a packet!\n");
return;
}
#endif
ret = write(fd, buf, buflen);
ret = up_write(gtapdevfd, buf, buflen);
if(ret == -1)
{
perror("tap_dev: tapdev_send: write");