_syscall0() and gettid()
i was debugging a DirectFB build failure when i noticed that _syscall0() doesnt seem to be quite right ...
going by this little bit of code (see gettid(2) for info):
#include <sys/types.h>
#include <linux/unistd.h>
#include <errno.h>_syscall0(pid_t,gettid)pid_t gettid(void);
int main() { return 0; }
it fails to compile :(gettid.c: In function `gettid':
gettid.c:5: error: parse error before ')' token
tried with gcc-3.3.5 and gcc-3.4.3 ...
using linux-2.6.8.1 headers here, but the define for _syscall0() doesnt seem to be different in 2.4 or 2.6 ... so what am i missing here ? :) -mike
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Quoted 2 lines · Mike Frysinger
gettid.c: In function `gettid':
gettid.c:5: error: parse error before ')' token
ok, the error is K_INLINE_SYSCALL in asm/unistd.h in the last if statement:
__sys_res = (long)__res; \
} \
if ( (unsigned long)__sys_res >= (unsigned long)-4095 ){ \
- errno = -__sys_res); \
+ errno = -__sys_res; \
__sys_res = -1; \
} \
__sys_res; \that assignment to errno ... the parentheses is unbalanced ... i guess it could just be removed altogether :)
-mike
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Quoted 4 lines · Mike Frysinger
(quoted diff) +1
-1- errno = -__sys_res); \ + errno = -__sys_res; \that assignment to errno ... the parentheses is unbalanced ... i guess it could just be removed altogether :)
Checked in. Thanks!
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