{"id":10795,"date":"2020-03-29T10:10:29","date_gmt":"2020-03-29T10:10:29","guid":{"rendered":"http:\/\/blog.bachi.net\/?p=10795"},"modified":"2020-03-29T10:26:03","modified_gmt":"2020-03-29T10:26:03","slug":"freebsd-kvm-kernel-virtual-memory-access","status":"publish","type":"post","link":"https:\/\/blog.bachi.net\/?p=10795","title":{"rendered":"FreeBSD KVM (Kernel Virtual Memory Access)"},"content":{"rendered":"

svnweb.freebsd.org\/base\/release\/10.2.0\/bin\/pkill\/<\/a>
\nTracker<\/a>, is a filesystem indexer, metadata storage system and search tool.
\nfossies.org\/linux\/tracker\/src\/tracker\/tracker-process.c<\/a><\/p>\n

How can a process inquire, when it was started?<\/a>
\ngithub.com\/dnabre\/misc\/tree\/master\/proc_info<\/a>, Get time process started
\ngithub.com\/hishamhm\/htop\/blob\/master\/freebsd\/FreeBSDProcessList.c<\/a><\/p>\n

\r\n#include <stdio.h>\r\n#include <stdlib.h>\r\n#include <string.h>\r\n#include <unistd.h>\r\n\r\n#include <signal.h>\r\n\r\n\/* _POSIX2_LINE_MAX *\/\r\n#include <limits.h>\r\n\r\n\/* kvm_openfiles(), kvm_getprocs() *\/\r\n#include <kvm.h>\r\n\r\n\/* errx() *\/\r\n#include <err.h>\r\n\r\n\/* _PATH_DEVNULL *\/\r\n#include <paths.h>\r\n\r\n\/* O_RDONLY *\/\r\n#include <fcntl.h>\r\n\r\n\/* KERN_PROC_PROC *\/\r\n#include <sys\/sysctl.h>\r\n\r\n\/* struct kinfo_proc *\/\r\n#include <sys\/user.h>\r\n\r\n#define STATUS_MATCH    0\r\n#define STATUS_NOMATCH  1\r\n#define STATUS_BADUSAGE 2\r\n#define STATUS_ERROR    3\r\n\r\nint\r\nmain(int argc, char **argv)\r\n{\r\n    int i;\r\n\r\n    \/* PID *\/\r\n    pid_t mypid;\r\n    pid_t pid;\r\n\r\n    \/* KVM openfiles() *\/\r\n    kvm_t      *kd;\r\n    const char *execf;\r\n    const char *coref;\r\n    char        buf[_POSIX2_LINE_MAX];\r\n\r\n    \/* KVM getprocs() *\/\r\n    int                 nproc;\r\n    struct kinfo_proc  *plist;\r\n    struct kinfo_proc  *kp;\r\n\r\n    \/* KVM getargv() *\/\r\n    char **strv;\r\n\r\n    char *selected;\r\n\r\n    execf = NULL;\r\n    coref = _PATH_DEVNULL;\r\n\r\n    mypid = getpid();\r\n\r\n    \/*\r\n     * Retrieve the list of running processes from the kernel.\r\n     *\/\r\n    kd = kvm_openfiles(execf, coref, NULL, O_RDONLY, buf);\r\n    if (kd == NULL)\r\n        errx(STATUS_ERROR, "Cannot open kernel files (%s)", buf);\r\n\r\n    \/*\r\n     * Use KERN_PROC_PROC instead of KERN_PROC_ALL, since we\r\n     * just want processes and not individual kernel threads.\r\n     *\/\r\n    plist = kvm_getprocs(kd, KERN_PROC_PROC, 0, &nproc);\r\n    if (plist == NULL) {\r\n        errx(STATUS_ERROR, "Cannot get process list (%s)",\r\n            kvm_geterr(kd));\r\n    }\r\n    printf("nproc=%d\\n", nproc);\r\n\r\n    \/*\r\n     * Allocate memory which will be used to keep track of the\r\n     * selection.\r\n     *\/\r\n    if ((selected = malloc(nproc)) == NULL) {\r\n        err(STATUS_ERROR, "Cannot allocate memory for %d processes",\r\n            nproc);\r\n    }\r\n    memset(selected, 0, nproc);\r\n\r\n    \/*\r\n     * Take the appropriate action for each matched process, if any.\r\n     *\/\r\n    for (i = 0, kp = plist; i < nproc; i++, kp++) {\r\n        printf("comm=%s tdname=%s wmesg=%s login=%s lockname=%s emul=%s loginclass=%s",\r\n            kp->ki_comm,\r\n            kp->ki_tdname,\r\n            kp->ki_wmesg,\r\n            kp->ki_login,\r\n            kp->ki_lockname,\r\n            kp->ki_emul,\r\n            kp->ki_loginclass);\r\n        if ((strv = kvm_getargv(kd, kp, 0)) != NULL) {\r\n            printf(" argv=%s", strv[0]);\r\n        }\r\n        printf("\\n");\r\n    }\r\n\r\n    return 0;\r\n}\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"
svnweb.freebsd.org\/base\/release\/10.2.0\/bin\/pkill\/ Tracker, is a filesystem indexer, metadata storage system and search tool. fossies.org\/linux\/tracker\/src\/tracker\/tracker-process.c How can a process inquire, when it was started? github.com\/dnabre\/misc\/tree\/master\/proc_info, Get time process started github.com\/hishamhm\/htop\/blob\/master\/freebsd\/FreeBSDProcessList.c #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <signal.h> \/* _POSIX2_LINE_MAX *\/ #include <limits.h> \/* kvm_openfiles(), kvm_getprocs() *\/ #include <kvm.h> \/* errx() *\/ #include <err.h> \/* […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10795","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/posts\/10795","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10795"}],"version-history":[{"count":5,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/posts\/10795\/revisions"}],"predecessor-version":[{"id":10800,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/posts\/10795\/revisions\/10800"}],"wp:attachment":[{"href":"https:\/\/blog.bachi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10795"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10795"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10795"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}