xv6-65oo2/user/user.h

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struct stat;
struct rtcdate;
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// system calls
int fork(void);
int exit(int) __attribute__((noreturn));
int wait(int*);
int pipe(int*);
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int write(int, const void*, int);
int read(int, void*, int);
int close(int);
int kill(int);
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int exec(char*, char**);
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int open(const char*, int);
int mknod(const char*, short, short);
int unlink(const char*);
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int fstat(int fd, struct stat*);
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int link(const char*, const char*);
int mkdir(const char*);
int chdir(const char*);
int dup(int);
int getpid(void);
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char* sbrk(int);
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int sleep(int);
int uptime(void);
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// ulib.c
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int stat(const char*, struct stat*);
char* strcpy(char*, const char*);
void *memmove(void*, const void*, int);
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char* strchr(const char*, char c);
int strcmp(const char*, const char*);
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void fprintf(int, const char*, ...);
void printf(const char*, ...);
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char* gets(char*, int max);
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uint strlen(const char*);
void* memset(void*, int, uint);
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void* malloc(uint);
void free(void*);
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int atoi(const char*);