diff options
Diffstat (limited to 'vms/vms.c')
| -rw-r--r-- | vms/vms.c | 100 |
1 files changed, 100 insertions, 0 deletions
@@ -1093,6 +1093,106 @@ Perl_my_sigaction (pTHX_ int sig, const struct sigaction* act, /*}}}*/ #endif +#ifdef KILL_BY_SIGPRC +#include <errnodef.h> + +/* okay, this is some BLATENT hackery ... + we use this if the kill() in the CRTL uses sys$forcex, causing the + target process to do a sys$exit, which usually can't be handled + gracefully...certainly not by Perl and the %SIG{} mechanism. + + Instead we use the (undocumented) system service sys$sigprc. + It has the same parameters as sys$forcex, but throws an exception + in the target process rather than calling sys$exit. + + Note that distinguishing SIGSEGV from SIGBUS requires an extra arg + on the ACCVIO condition, which sys$sigprc (and sys$forcex) don't + provide. On VMS 7.0+ this is taken care of by doing sys$sigprc + with condition codes C$_SIG0+nsig*8, catching the exception on the + target process and resignaling with appropriate arguments. + + But we don't have that VMS 7.0+ exception handler, so if you + Perl_my_kill(.., SIGSEGV) it will show up as a SIGBUS. Oh well. + + Also note that SIGTERM is listed in the docs as being "unimplemented", + yet always seems to be signaled with a VMS condition code of 4 (and + correctly handled for that code). So we hardwire it in. + + Unlike the VMS 7.0+ CRTL kill() function, we actually check the signal + number to see if it's valid. So Perl_my_kill(pid,0) returns -1 rather + than signalling with an unrecognized (and unhandled by CRTL) code. +*/ + +#define _MY_SIG_MAX 17 + +int +Perl_my_kill(int pid, int sig) +{ + int iss; + int sys$sigprc(unsigned int *pidadr, + struct dsc$descriptor_s *prcname, + unsigned int code); + static unsigned long sig_code[_MY_SIG_MAX+1] = + { + 0, /* 0 ZERO */ + SS$_HANGUP, /* 1 SIGHUP */ + SS$_CONTROLC, /* 2 SIGINT */ + SS$_CONTROLY, /* 3 SIGQUIT */ + SS$_RADRMOD, /* 4 SIGILL */ + SS$_BREAK, /* 5 SIGTRAP */ + SS$_OPCCUS, /* 6 SIGABRT */ + SS$_COMPAT, /* 7 SIGEMT */ +#ifdef __VAX + SS$_FLTOVF, /* 8 SIGFPE VAX */ +#else + SS$_HPARITH, /* 8 SIGFPE AXP */ +#endif + SS$_ABORT, /* 9 SIGKILL */ + SS$_ACCVIO, /* 10 SIGBUS */ + SS$_ACCVIO, /* 11 SIGSEGV */ + SS$_BADPARAM, /* 12 SIGSYS */ + SS$_NOMBX, /* 13 SIGPIPE */ + SS$_ASTFLT, /* 14 SIGALRM */ + 4, /* 15 SIGTERM */ + 0, /* 16 SIGUSR1 */ + 0 /* 17 SIGUSR2 */ + }; + +#if __VMS_VER >= 60200000 + static int initted = 0; + if (!initted) { + initted = 1; + sig_code[16] = C$_SIGUSR1; + sig_code[17] = C$_SIGUSR2; + } +#endif + + if (!pid || sig < _SIG_MIN || sig > _SIG_MAX || sig > _MY_SIG_MAX || !sig_code[sig]) { + return -1; + } + + iss = sys$sigprc((unsigned int *)&pid,0,sig_code[sig]); + if (iss&1) return 0; + + switch (iss) { + case SS$_NOPRIV: + set_errno(EPERM); break; + case SS$_NONEXPR: + case SS$_NOSUCHNODE: + case SS$_UNREACHABLE: + set_errno(ESRCH); break; + case SS$_INSFMEM: + set_errno(ENOMEM); break; + default: + _ckvmssts(iss); + set_errno(EVMSERR); + } + set_vaxc_errno(iss); + + return -1; +} +#endif + /* default piping mailbox size */ #define PERL_BUFSIZ 512 |