?? syscalls.c
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/* System Calls Remapping */#include <sys/stat.h>#include <stdlib.h>#include <errno.h>#undef errnoextern int errno;int _read (int file, char * ptr, int len) { return 0;}int _lseek (int file, int ptr, int dir) { return 0;}extern int putchar (int ch);int _write (int file, char * ptr, int len) { int i; for (i = 0; i < len; i++) putchar (*ptr++); return len;}int _open (const char * path, int flags, ...) { return -1;}int _close (int file) { return -1;}void _exit (int n) {label: goto label; /* endless loop */}int _kill (int n, int m) { errno = EINVAL; return(-1);}int _getpid (int n) { return 1;}register char * stack_ptr asm ("sp");caddr_t _sbrk (int incr) { extern char end asm ("end"); /* Defined by the linker */ static char * heap_end; char * prev_heap_end; if (heap_end == NULL) heap_end = &end; prev_heap_end = heap_end; if (heap_end + incr > stack_ptr) { _write (1, "_sbrk: Heap and stack collision\n", 32); abort (); } heap_end += incr; return (caddr_t) prev_heap_end;}int _fstat (int file, struct stat * st) { st->st_mode = S_IFCHR; return 0;}int _link (void) { errno = EMLINK; return -1;}int _unlink (void) { errno = ENOENT; return -1;}void _raise (void) {}int isatty (int fd) { return 1;}
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