meetbill / supervise Goto Github PK
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基于 D. J. Bernstein's daemontools https://cr.yp.to/daemontools.html
如果用 od -d status 或 od -t u2 status 读取 2 字节,无符号短整型,最大值是 65535。
-d 此参数的效果和同时指定"-tu2"参数相同
如果 cat /proc/sys/kernel/pid_max 大于这个数。od -d status
读出来的 pid 就有可能是错的。
static void pidchange()
{
struct taia now;
unsigned long u;
taia_now(&now);
taia_pack(status, &now);
u = (unsigned long) pid;
status[16] = u; u >>= 8;
status[17] = u; u >>= 8;
status[18] = u; u >>= 8;
status[19] = u;
}
需要修改为
旧:
pid=$(od -d status | head -n 2 | tail -n 1 | awk '{print $2}')
需要改为:
od -An -j16 -N4 -tu4 status
make
make --directory=supervise
make[1]: Entering directory '/home/meetbill/supervise/supervise'
sh find-systype.sh > systype
rm -f compile
sh print-cc.sh > compile
chmod 555 compile
./compile byte_chr.c
./compile byte_copy.c
./compile byte_cr.c
./compile byte_diff.c
./compile byte_rchr.c
./compile fmt_uint.c
./compile fmt_uint0.c
./compile fmt_ulong.c
rm -f makelib
sh print-ar.sh > makelib
chmod 555 makelib
./compile scan_ulong.c
./compile str_chr.c
./compile str_diff.c
./compile str_len.c
./compile str_start.c
./makelib byte.a byte_chr.o byte_copy.o byte_cr.o byte_diff.o \
byte_rchr.o fmt_uint.o fmt_uint0.o fmt_ulong.o scan_ulong.o str_chr.o \
str_diff.o str_len.o str_start.o
make[1]: *** No rule to make target 'home', needed by 'choose'. Stop.
make[1]: Leaving directory '/home/meetbill/supervise/supervise'
make: *** [Makefile:6: supervise] Error 2
执行文件会输出信息到 stdout & stderr,如
test.sh
while :
do
date
sleep 1
done
直接执行如下命令
./supervise -p "status/test" -f "./test.sh 1>>__stdout 2>&1"
发现并没有产生 __stdout 文件
执行 lsof -p ${pid}
输出如下
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
...
test.sh 22878 work 0u CHR 1,3 0t0 1028 /dev/null
test.sh 22878 work 1u CHR 1,3 0t0 1028 /dev/null
test.sh 22878 work 2u CHR 1,3 0t0 1028 /dev/null
如果不想改动原进程,可以在 supervise 上进行改动
diff --git a/supervise/supervise.c b/supervise/supervise.c
--- a/supervise/supervise.c
+++ b/supervise/supervise.c
@@ -463,6 +463,8 @@ static void trystart()
case 0:
sig_uncatch(sig_child);
sig_unblock(sig_child);
+ freopen("_stdout.log", "a+", stdout);
+ freopen("_stderr.log", "a+", stderr);
execvp(cmd[0], cmdp);
write_log(fdlogwf, FATAL, "unable to start ", cmd[0], "\n");
_exit(1);
如果想可配置,可以将配置项配置到 supervise.conf 中
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