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    Contents of /trunk/mkinitrd-magellan/klibc/usr/klibc/sigaction.c

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    Revision 532 - (show annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
    File MIME type: text/plain
    File size: 1321 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    1 /*
    2 * sigaction.c
    3 */
    4
    5 #include <signal.h>
    6 #include <sys/syscall.h>
    7 #include <klibc/sysconfig.h>
    8
    9 __extern void __sigreturn(void);
    10 __extern int __sigaction(int, const struct sigaction *, struct sigaction *);
    11 #ifdef __sparc__
    12 __extern int __rt_sigaction(int, const struct sigaction *, struct sigaction *,
    13 void (*)(void), size_t);
    14 #else
    15 __extern int __rt_sigaction(int, const struct sigaction *, struct sigaction *,
    16 size_t);
    17 #endif
    18
    19 int sigaction(int sig, const struct sigaction *act, struct sigaction *oact)
    20 {
    21 int rv;
    22
    23 #if _KLIBC_NEEDS_SA_RESTORER
    24 struct sigaction sa;
    25
    26 if (act && !(act->sa_flags & SA_RESTORER)) {
    27 sa = *act;
    28 act = &sa;
    29
    30 /* The kernel can't be trusted to have a valid default
    31 restorer */
    32 sa.sa_flags |= SA_RESTORER;
    33 sa.sa_restorer = &__sigreturn;
    34 }
    35 #endif
    36
    37 #if _KLIBC_USE_RT_SIG
    38 # ifdef __sparc__
    39 {
    40 void (*restorer)(void);
    41 restorer = (act && act->sa_flags & SA_RESTORER)
    42 ? (void (*)(void))((uintptr_t)act->sa_restorer - 8)
    43 : NULL;
    44 rv = __rt_sigaction(sig, act, oact, restorer, sizeof(sigset_t));
    45 }
    46 # else
    47 rv = __rt_sigaction(sig, act, oact, sizeof(sigset_t));
    48 # endif
    49 #else
    50 rv = __sigaction(sig, act, oact);
    51 #endif
    52
    53 #if _KLIBC_NEEDS_SA_RESTORER
    54 if (oact && (oact->sa_restorer == &__sigreturn)) {
    55 oact->sa_flags &= ~SA_RESTORER;
    56 }
    57 #endif
    58
    59 return rv;
    60 }