learn-c.md

Learn C Library

stdio.h

printf

// print to stdout
int printf(const char* str, ...); 
// print to buffer
int sprintf(char *str, const char *string,...); 
// print to file
int fprintf(FILE *fptr, const char *str, ...);

fopen

FILE *fopen(const char *pathname, const char *mode);
FILE *fdopen(int fd, const char *mode);
FILE *freopen(const char *pathname, const char *mode, FILE *stream);

signal.h

signal

• SIGABRT
• SIGFPE
• SIGILL
• SIGINT
• SIGSEGV
• SIGTERM

gerneration

• raise()
  • current process
• kill()
  • specific process

handler

• signal()
• sigaction()

fcntl.h

open

int open(const char *pathname, int flags);
int open(const char *pathname, int flags, mode_t mode);
int creat(const char *pathname, mode_t mode);
int openat(int dirfd, const char *pathname, int flags);
int openat(int dirfd, const char *pathname, int flags, mode_t mode);

math.h

trigonometric