diff options
Diffstat (limited to 'src/conf/sysconf.c')
| -rw-r--r-- | src/conf/sysconf.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/conf/sysconf.c b/src/conf/sysconf.c index 3baaed32..8dd5c725 100644 --- a/src/conf/sysconf.c +++ b/src/conf/sysconf.c @@ -4,6 +4,7 @@ #include <sys/resource.h> #include <signal.h> #include <sys/sysinfo.h> +#include <sys/auxv.h> #include "syscall.h" #include "libc.h" @@ -19,6 +20,8 @@ #define JT_AVPHYS_PAGES JT(9) #define JT_ZERO JT(10) #define JT_DELAYTIMER_MAX JT(11) +#define JT_MINSIGSTKSZ JT(12) +#define JT_SIGSTKSZ JT(13) #define RLIM(x) (-32768|(RLIMIT_ ## x)) @@ -165,6 +168,9 @@ long sysconf(int name) [_SC_XOPEN_STREAMS] = JT_ZERO, [_SC_THREAD_ROBUST_PRIO_INHERIT] = -1, [_SC_THREAD_ROBUST_PRIO_PROTECT] = -1, + + [_SC_MINSIGSTKSZ] = JT_MINSIGSTKSZ, + [_SC_SIGSTKSZ] = JT_SIGSTKSZ, }; if (name >= sizeof(values)/sizeof(values[0]) || !values[name]) { @@ -212,6 +218,18 @@ long sysconf(int name) mem *= si.mem_unit; mem /= PAGE_SIZE; return (mem > LONG_MAX) ? LONG_MAX : mem; + case JT_MINSIGSTKSZ & 255: + case JT_SIGSTKSZ & 255: ; + /* Value from auxv/kernel is only sigfame size. Clamp it + * to at least 1k below arch's traditional MINSIGSTKSZ, + * then add 1k of working space for signal handler. */ + unsigned long sigframe_sz = __getauxval(AT_MINSIGSTKSZ); + if (sigframe_sz < MINSIGSTKSZ - 1024) + sigframe_sz = MINSIGSTKSZ - 1024; + unsigned val = sigframe_sz + 1024; + if (values[name] == JT_SIGSTKSZ) + val += SIGSTKSZ - MINSIGSTKSZ; + return val; case JT_ZERO & 255: return 0; } |