xv6/user.h

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