DO_CALL (syscall_name, args);
cmpl $-4095, %eax;
jae SYSCALL_ERROR_LABEL;
rather than a simple test on the sign that is currently in rtl/linux/i386/syscalls.inc. There is a helpful comment explaining this (in glibc/sysdeps/unix/sysv/linux/i386/sysdeps.h):
/* Linux uses a negative return value to indicate syscall errors, unlike most Unices, which use the condition codes' carry flag.
Since version 2.1 the return value of a system call might be negative even if the call succeeded. E.g., the `lseek' system call might return a large offset. Therefore we must not anymore test for < 0, but test for a real error by making sure the value in %eax is a real error number. Linus said he will make sure the no syscall returns a value in -1 .. -4095 as a valid result so we can savely test with -4095. */
Colin
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