Micropython usignal.py for phusion passenger's my_init

signal.py

import ffilib

# Full linux signal list:   
               #Spec - Default Action - Description
#SIG_DFL = 0
#SIG_IGN = 1
#SIGHUP = 1     # P1990 - Terminate - Hangup detected on controlling terminal or death of controlling process
#SIGINT = 2     # P1990 - Terminate - Interrupt from keyboard
#SIGQUIT = 3    # P1990 - Core dump - Quit from keyboard
#SIGILL = 4     # P1990 - Core dump - Illegal Instruction
#SIGABRT = 5    # P1990 - Core dump - Abort signal from abort(3)
#SIGIOT = 6     #   -   - Core dump - IOT trap. A synonym for SIGABRT
#SIGBUS = 7     # P2001 - Core dump - Bus error (bad memory access)    (Toasty!)
#SIGFPE = 8     # P1990 - Core dump - Floating-point exception
#SIGKILL = 9    # P1990 - Terminate - Kill signal
#SIGUSR1 = 10   # P1990 - Terminate - User-defined signal 1
#SIGSEGV = 11   # P1990 - Core dump - Invalid memory reference   (Toasty!)
#SIGUSR2 = 12   # P1990 - Terminate - User-defined signal 2
#SIGPIPE = 13   # P1990 - Terminate - Broken pipe: write to pipe with no readers; see pipe(7)   (Toasty!)
#SIGALRM = 14   # P1990 - Terminate - Timer signal from alarm(2)
#SIGTERM = 15   # P1990 - Terminate - Termination signal
#SIGSTKFLT = 16 #   -   - Terminate - Stack fault on coprocessor (unused)    (Toasty!)
#SIGCHLD = 17   # P1990 - Ignore    - Child stopped or terminated
#SIGCONT = 18   # P1990 - Continue  - Continue process if stopped
#SIGSTOP = 19   # P1990 - Stop      - Stop process
#SIGTSTP = 20   # P1990 - Stop      - Stop typed at terminal
#SIGTTIN = 21   # P1990 - Stop      - Terminal input for background process
#SIGTTOU = 22   # P1990 - Stop      - Terminal output for background process
#SIGURG = 23    # P2001 - Ignore    - Urgent condition on socket (4.2BSD)
#SIGXCPU = 24   # P2001 - Core dump - CPU time limit exceeded (4.2BSD)   (Toasty!)
#SIGXFSZ = 25   # P2001 - Core dump - File size limit exceeded (4.2BSD)   (Toasty!)
#SIGVTALRM = 26 # P2001 - Terminate - Virtual alarm clock (4.2BSD)
#SIGPROF = 27   # P2001 - Terminate - Profiling timer expired
#SIGWINCH = 28  #   -   - Ignore    - Window resize signal (4.3BSD, Sun)
#SIGIO = 29     #   -   - Terminate - I/O now possible (4.2BSD)
#SIGPOLL = 29   # P2001 - Terminate - Pollable event (Sys V). Synonym for SIGIO
#SIGPWR = 30    #   -   - Terminate - Power failure (System V) (UNUSED)   (Toasty!)
#SIGSYS = 31    # P2001 - Core dump - Bad system call (SVr4); See also: seccomp(2) !gettimeofday64?~   (Toasty!)


# Original:
SIG_DFL = 0
SIG_IGN = 1

SIGHUP = 1  # New!
SIGINT = 2
SIGQUIT = 3 # New!
SIGPIPE = 13
SIGTERM = 15

# We need:
# Needed for my_init
SIGALRM = 14
SIGCHLD = 17
SIGCONT = 18
SIGSTOP = 19
# Remote console Window Changed size
SIGWINCH = 28



libc = ffilib.libc()

signal_i = libc.func("i", "signal", "ii")
signal_p = libc.func("i", "signal", "ip")

def signal(n, handler):
    if isinstance(handler, int):
        return signal_i(n, handler)
    import ffi
    cb = ffi.callback("v", handler, "i")
    return signal_p(n, cb)