FreeBSD source tree https://cgit-dev.freebsd.org/src-test2/atom?h=releng%2F6.3 2003-07-24T07:34:31Z 2003-07-24T07:34:31Z Marcel Moolenaar marcel@FreeBSD.org 2003-07-24T07:34:31Z urn:sha1:286cc4901448f19261ed2a665200899106cf29f6 is only read and written by set_mcontext() and get_mcontext() for use by threading libraries. 2002-11-16T06:35:53Z Daniel Eischen deischen@FreeBSD.org 2002-11-16T06:35:53Z urn:sha1:2be05b70c9be806a2e5edf3fda36628a81ed3595 Previously these were libc functions but were requested to be made into system calls for atomicity and to coalesce what might be two entrances into the kernel (signal mask setting and floating point trap) into one. A few style nits and comments from bde are also included. Tested on alpha by: gallatin 2002-10-25T19:10:58Z Peter Wemm peter@FreeBSD.org 2002-10-25T19:10:58Z urn:sha1:23eeeff7bee66bd81fa2d7ec9d648339bd0d041f handling clean and functional as 5.x evolves. This allows some of the nasty bandaids in the 5.x codepaths to be unwound. Encapsulate 4.x signal handling under COMPAT_FREEBSD4 (there is an anti-foot-shooting measure in place, 5.x folks need this for a while) and finish encapsulating the older stuff under COMPAT_43. Since the ancient stuff is required on alpha (longjmp(3) passes a 'struct osigcontext *' to the current sigreturn(2), instead of the 'ucontext_t *' that sigreturn is supposed to take), add a compile time check to prevent foot shooting there too. Add uniform COMPAT_43 stubs for ia64/sparc64/powerpc. Tested on: i386, alpha, ia64. Compiled on sparc64 (a few days ago). Approved by: re 2002-01-10T02:36:30Z Daniel Eischen deischen@FreeBSD.org 2002-01-10T02:36:30Z urn:sha1:8ec12ea9ce96e6395207d6d3334a7ed7d76749cf and to inherently verify its validity. Alpha signal frames and trap frames are different; this field identifies which format the context is Set the machine context format (signal frame) before copying it out when sending a signal. Approved by: -arch 1999-10-08T09:09:13Z Doug Rabson dfr@FreeBSD.org 1999-10-08T09:09:13Z urn:sha1:648f4ed3ded97cb43ec575ba53cddff3025997de 1999-10-04T19:33:58Z Marcel Moolenaar marcel@FreeBSD.org 1999-10-04T19:33:58Z urn:sha1:c5c6b7b38e4bca2844dc9f7e10f5791100c72b4c struct sigcontext and ucontext_t/mcontext_t are defined in such a way that both (ie struct sigcontext and ucontext_t) can be passed on to sigreturn. The signal handler is still given a ucontext_t for maximum flexibility. For backward compatibility sigreturn restores the state for the alternate signal stack from sigcontext.sc_onstack and not from ucontext_t.uc_stack. A good way to determine which value the application has set and thus which value to use, is still open for discussion. NOTE: This change should only affect those binaries that use sigcontext and/or ucontext_t. In the source tree itself this is only doscmd. Recompilation is required for those applications. This commit also fixes a lot of style bugs without hopefully adding new ones. NOTE: struct sigaltstack.ss_size now has type size_t again. For some reason I changed that into unsigned int. Parts submitted by: bde sigaltstack bug found by: bde 1999-09-29T15:06:27Z Marcel Moolenaar marcel@FreeBSD.org 1999-09-29T15:06:27Z urn:sha1:91078fca0cb2bb1d02316eeb7d2dd5ab422f00e4 ----------------------------- By introducing a new sigframe so that the signal handler operates on the new siginfo_t and on ucontext_t instead of sigcontext, we now need two version of sendsig and sigreturn. A flag in struct proc determines whether the process expects an old sigframe or a new sigframe. The signal trampoline handles which sigreturn to call. It does this by testing for a magic cookie in the frame. The alpha uses osigreturn to implement longjmp. This means that osigreturn is not only used for compatibility with existing binaries. To handle the new sigset_t, setjmp saves it in sc_reserved (see NOTE). the struct sigframe has been moved from frame.h to sigframe.h to handle the complex header dependencies that was caused by the new sigframe. NOTE: For the i386, the size of jmp_buf has been increased to hold the new sigset_t. On the alpha this has been prevented by using sc_reserved in sigcontext.