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Provide usrstack sysctls, libc backtrace() now works
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+36
src/kernel/emulation/linux/misc/sysctl_kern.c
+36
src/kernel/emulation/linux/misc/sysctl_kern.c
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#include "sysctl_kern.h"
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#include "sysctl_proc.h"
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#include "getrlimit.h"
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#include "../ext/sysinfo.h"
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#include "../ext/syslog.h"
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static sysctl_handler(handle_maxproc);
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static sysctl_handler(handle_netboot);
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static sysctl_handler(handle_safeboot);
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static sysctl_handler(handle_usrstack32);
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static sysctl_handler(handle_usrstack64);
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static sysctl_handler(handle_sysv_semmns);
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extern int _sysctl_proc(int what, int flag, struct kinfo_proc* out, unsigned long* buflen);
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{ .oid = KERN_OSRELEASE, .type = CTLTYPE_STRING, .exttype = "S", .name = "osrelease", .handler = handle_osrelease },
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{ .oid = KERN_VERSION, .type = CTLTYPE_STRING, .exttype = "S", .name = "version", .handler = handle_version },
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{ .oid = KERN_OSVERSION, .type = CTLTYPE_STRING, .exttype = "S", .name = "osversion", .handler = handle_osversion },
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{ .oid = KERN_USRSTACK32, .type = CTLTYPE_INT, .exttype = "I", .name = "usrstack", .handler = handle_usrstack32 },
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{ .oid = KERN_USRSTACK64, .type = CTLTYPE_QUAD, .exttype = "Q", .name = "usrstack64", .handler = handle_usrstack64 },
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{ .oid = KERN_SYSV, .type = CTLTYPE_NODE, .exttype = "", .name = "sysv", .subctls = sysctls_kern_sysv },
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{ .oid = -1 }
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};
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return 0;
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}
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static void* mystack(void)
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{
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char buf[400];
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char* ptr = buf;
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if (!read_string("/proc/self/stat", buf, sizeof(buf)))
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return NULL;
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skip_stat_elems(&ptr, 27);
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const char* stack = next_stat_elem(&ptr);
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return (void*) __simple_atoi(stack, NULL);
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}
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sysctl_handler(handle_usrstack32)
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{
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unsigned int* ovalue = (unsigned int*) old;
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if (ovalue)
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*ovalue = mystack();
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*oldlen = sizeof(*ovalue);
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return 0;
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}
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sysctl_handler(handle_usrstack64)
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{
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unsigned long long* ovalue = (unsigned long long*) old;
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if (ovalue)
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*ovalue = mystack();
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*oldlen = sizeof(*ovalue);
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return 0;
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}