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libc: add clock_settime() system call.

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This also adds the sys_settime() kernel call which allows for the adjusting
of the clock named realtime in the kernel. The existing sys_stime()
function is still needed for a separate job (setting the boottime). The
boottime is set in the readclock driver. The sys_settime() interface is
meant to be flexible and will support both clock_settime() and adjtime()
when adjtime() is implemented later.

settimeofday() was adjusted to use the clock_settime() interface.

One side note discovered during testing: uptime(1) (part of the last(1)),
uses wtmp to determine boottime (not Minix's times(2)). This leads `uptime`
to report odd results when you set the time to a time prior to boottime.
This isn't a new bug introduced by my changes. It's been there for a while.
This commit is contained in:
Thomas Cort
2013-03-30 16:59:21 +00:00
committed by Ben Gras
parent 18ad4c0799
commit 516fec97d9
24 changed files with 179 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
include/minix/callnr.h
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@@ -1,4 +1,4 @@
#define NCALLS 116 /* number of system calls allowed */
#define NCALLS 117 /* number of system calls allowed */
/* In case it isn't obvious enough: this list is sorted numerically. */
#define EXIT 1
@@ -104,6 +104,7 @@
#define PM_GETSID 113 /* PM getsid() */
#define CLOCK_GETRES 114 /* clock_getres() */
#define CLOCK_GETTIME 115 /* clock_gettime() */
#define CLOCK_SETTIME 116 /* clock_settime() */
#define TASK_REPLY 121 /* to VFS: reply code from drivers, not
* really a standalone call.

7
include/minix/com.h
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@@ -335,6 +335,7 @@
# define SYS_PROFBUF (KERNEL_CALL + 38) /* sys_profbuf() */
# define SYS_STIME (KERNEL_CALL + 39) /* sys_stime() */
# define SYS_SETTIME (KERNEL_CALL + 40) /* sys_settime() */
# define SYS_VMCTL (KERNEL_CALL + 43) /* sys_vmctl() */
# define SYS_SYSCTL (KERNEL_CALL + 44) /* sys_sysctl() */
@@ -491,6 +492,12 @@
#define T_REAL_TICKS m4_l4 /* number of wall clock ticks since boottime */
#define T_BOOT_TICKS m4_l5 /* number of hard clock ticks since boottime */
/* Field names for SYS_SETTIME. */
#define T_SETTIME_NOW m4_l2 /* non-zero for immediate, 0 for adjtime */
#define T_CLOCK_ID m4_l3 /* clock to adjust */
#define T_TIME_SEC m4_l4 /* time in seconds since 1970 */
#define T_TIME_NSEC m4_l5 /* number of nano seconds */
/* Field names for SYS_TRACE, SYS_PRIVCTL, SYS_STATECTL. */
#define CTL_ENDPT m2_i1 /* process number of the caller */
#define CTL_REQUEST m2_i2 /* server control request */

1
include/minix/syslib.h
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@@ -65,6 +65,7 @@ int sys_vmctl_get_memreq(endpoint_t *who, vir_bytes *mem, vir_bytes
int sys_vmctl_enable_paging(void * data);
int sys_readbios(phys_bytes address, void *buf, size_t size);
int sys_settime(int now, clockid_t clk_id, time_t sec, long nsec);
int sys_stime(time_t boottime);
int sys_sysctl(int ctl, char *arg1, int arg2);
int sys_sysctl_stacktrace(endpoint_t who);

2
include/time.h
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@@ -162,10 +162,8 @@ int clock_getres(clockid_t, struct timespec *)
__RENAME(__clock_getres50);
int clock_gettime(clockid_t, struct timespec *)
__RENAME(__clock_gettime50);
#ifndef __minix
int clock_settime(clockid_t, const struct timespec *)
__RENAME(__clock_settime50);
#endif /* !__minix */
int nanosleep(const struct timespec *, struct timespec *)
__RENAME(__nanosleep50);
#ifndef __minix