shichao-an

/* https://github.com/shichao-an/linux-2.6.34.7/blob/master/kernel/sched.c#L89
 */
/*
 * Convert user-nice values [ -20 ... 0 ... 19 ]
 * to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ],
 * and back.
 */
#define NICE_TO_PRIO(nice)	(MAX_RT_PRIO + (nice) + 20)
#define PRIO_TO_NICE(prio)	((prio) - MAX_RT_PRIO - 20)
#define TASK_NICE(p)		PRIO_TO_NICE((p)->static_prio)

shichao-an

#include <signal.h>

void (*signal(int signo, void (*func)(int)))(int);

/* Returns: previous disposition of signal (see following) if OK, SIG_ERR on error */

shichao-an

#include <termios.h>

pid_t tcgetsid(int fd);

/* Returns: session leader’s process group ID if OK, −1 on error */

shichao-an

#include <termios.h>

pid_t tcgetsid(int fd);

/* Returns: session leader’s process group ID if OK, −1 on error */

shichao-an

#include <unistd.h>

pid_t tcgetpgrp(int fd);
/* Returns: process group ID of foreground process group if OK, −1 on error */

int tcsetpgrp(int fd, pid_t pgrpid);
/* Returns: 0 if OK, −1 on error */

shichao-an

#include <unistd.h>

pid_t getsid(pid_t pid);

/* Returns: session leader’s process group ID if OK, −1 on error */

shichao-an

#include <unistd.h>

pid_t setsid(void);

/* Returns: process group ID if OK, −1 on error */

shichao-an

#include <unistd.h>

int setpgid(pid_t pid, pid_t pgid);

/* Returns: 0 if OK, −1 on error */

shichao-an

#include <unistd.h>

pid_t getpgrp(void);
/* Returns: process group ID of calling process */

pid_t getpgid(pid_t pid);
/* Returns: process group ID if OK, −1 on error */

shichao-an

#include <sys/times.h>

clock_t times(struct tms *buf);

/* Returns: elapsed wall clock time in clock ticks if OK, −1 on error */