进程管理函数

7.1 atexit()

7.2 execl()

7.3 execlp()

7.4 execv()

7.5 execve()

7.6 execvp()

7.7 exit()

7.8 vfork()

7.9 _exit()

7.10 getpgid()

7.11 getpgrp()

7.12 getpid()

7.13 getppid()

7.14 getpriority()

7.15 nice()

7.16 on_exit()

7.17 setpgid()

7.18 setpgrp()

7.19 setpriority()

7.20 system()

7.21 wait()

7.22 waitpid()

7.23 fprintf()

7.24 fscanf()

7.25 printf()

7.26 sacnf()

7.27 sprintf()

7.28 sscanf()

7.29 vfprintf()

7.30 vfscanf()

7.31 vprintf()

7.32 vscanf()

7.33 vsprintf()

7.34 vsscanf()