chapter9 進(jìn)程關(guān)系

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pid_t getpgrp(void); ret:調(diào)用進(jìn)程的進(jìn)程組ID
pid_t getpgid(pid_t pid); ret:process group ID on seccess, -1 on error
int setpgid(pid_t pid, pid_t pgid); ret:0/-1

process group leader:

pid_t setsid(void); ret:process group ID on seccess,-1 on error

session leader:

pid_t getsid(viod); ret: session leader's process group ID on seccess, -1 on error

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