C 开发札记
1 Executable programs or shell commands2 System calls (functions provided by the kernel)3 Library calls (functions within program libraries)4 Special files (usually found in /dev)5 File formats and conventions eg /etc/passwd6 Games7 Miscellaneous (including macro packages and conventions), e.g. man(7), groff(7)8 System administration commands (usually only for root)9 Kernel routines [Non standard]

? ? ?man 按章节顺序号查找，所以如果想查函数，直接用man 2 XX or man 3 XX。

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2 linux 支持的标准signal （man 7 signal）

        Signal     Value     Action   Comment       ----------------------------------       SIGHUP        1       Term    Hangup detected on controlling terminal                                     or death of controlling process       SIGINT        2       Term    Interrupt from keyboard       SIGQUIT       3       Core    Quit from keyboard       SIGILL        4       Core    Illegal Instruction       SIGABRT       6       Core    Abort signal from abort(3)       SIGFPE        8       Core    Floating point exception       SIGKILL       9       Term    Kill signal       SIGSEGV      11       Core    Invalid memory reference       SIGPIPE      13       Term    Broken pipe: write to pipe with no                                     readers       SIGALRM      14       Term    Timer signal from alarm(2)       SIGTERM      15       Term    Termination signal       SIGUSR1   30,10,16    Term    User-defined signal 1       SIGUSR2   31,12,17    Term    User-defined signal 2       SIGCHLD   20,17,18    Ign     Child stopped or terminated       SIGCONT   19,18,25    Cont    Continue if stopped       SIGSTOP   17,19,23    Stop    Stop process       SIGTSTP   18,20,24    Stop    Stop typed at tty       SIGTTIN   21,21,26    Stop    tty input for background process       SIGTTOU   22,22,27    Stop    tty output for background process       The signals SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.

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