test linux sleep

test.md

test.c

#include <unistd.h>
void main() {
  sleep(5);
}

1. gcc test.c -o test.out
2. strace ./test.out

out

strace ./test.out
execve("./test.out", ["./test.out"], 0x7ffea75e6b50 /* 25 vars */) = 0
brk(NULL)                               = 0x55b534a49000
#....省略中间输出
nanosleep({tv_sec=5, tv_nsec=0}, 0x7ffc08dcebe0) = 0
exit_group(0)                           = ?
+++ exited with 0 +++

sleep 时间可以稍微调大一些， 这样在输出nanosleep后会有明显的等待