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libc: Implement times function

Browse Source 
https://pubs.opengroup.org/onlinepubs/009604599/functions/times.html

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Change-Id: If2cccfedd532a77f86035d16d36d94ae38d8f09c
This commit is contained in:
Xiang Xiao 2021-07-20 12:33:11 +08:00 committed by Alan Carvalho de Assis
parent df0e2a65b2
commit af1dceb3e3
3 changed files with 143 additions and 1 deletions
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81
include/sys/times.h Normal file
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@ -0,0 +1,81 @@
/****************************************************************************
* include/sys/times.h
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
#ifndef __INCLUDE_SYS_TIMES_H
#define __INCLUDE_SYS_TIMES_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <sys/types.h>
/****************************************************************************
* Public Type Definitions
****************************************************************************/
/* Structure describing CPU time used by a process and its children. */
struct tms
{
clock_t tms_utime; /* User CPU time. */
clock_t tms_stime; /* System CPU time. */
clock_t tms_cutime; /* User CPU time of dead children. */
clock_t tms_cstime; /* System CPU time of dead children. */
};
#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/****************************************************************************
* Name: times
*
* Description:
* The times() function shall fill the tms structure pointed to by buffer
* with time-accounting information.
*
* Returned Value:
* Upon successful completion, times() shall return the elapsed real time,
* in clock ticks, since an arbitrary point in the past (for example,
* system start-up time). This point does not change from one invocation
* of times() within the process to another. The return value may overflow
* the possible range of type clock_t. If times() fails, (clock_t)-1 shall
* be returned and errno set to indicate the error.
*
****************************************************************************/
clock_t times(FAR struct tms *buffer);
#undef EXTERN
#if defined(__cplusplus)
}
#endif
#endif /* __INCLUDE_SYS_TIMES_H */

2
libs/libc/unistd/Make.defs
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@ -23,7 +23,7 @@
CSRCS += lib_access.c lib_daemon.c lib_swab.c lib_pathconf.c lib_sysconf.c
CSRCS += lib_getopt_common.c lib_getopt.c lib_getopt_long.c
CSRCS += lib_getopt_longonly.c lib_getoptvars.c lib_getoptargp.c
CSRCS += lib_getopterrp.c lib_getoptindp.c lib_getoptoptp.c
CSRCS += lib_getopterrp.c lib_getoptindp.c lib_getoptoptp.c lib_times.c
CSRCS += lib_alarm.c lib_fstatvfs.c lib_statvfs.c lib_sleep.c lib_nice.c
CSRCS += lib_usleep.c lib_seteuid.c lib_setegid.c lib_geteuid.c lib_getegid.c
CSRCS += lib_setreuid.c lib_setregid.c lib_getrusage.c lib_utime.c lib_utimes.c

61
libs/libc/unistd/lib_times.c Normal file
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@ -0,0 +1,61 @@
/****************************************************************************
* libs/libc/unistd/lib_times.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <errno.h>
#include <string.h>
#include <sys/times.h>
#include <time.h>
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: times
*
* Description:
* The times() function shall fill the tms structure pointed to by buffer
* with time-accounting information.
*
* Returned Value:
* Upon successful completion, times() shall return the elapsed real time,
* in clock ticks, since an arbitrary point in the past (for example,
* system start-up time). This point does not change from one invocation
* of times() within the process to another. The return value may overflow
* the possible range of type clock_t. If times() fails, (clock_t)-1 shall
* be returned and errno set to indicate the error.
*
****************************************************************************/
clock_t times(FAR struct tms *buffer)
{
if (buffer == NULL)
{
set_errno(EINVAL);
return -1;
}
memset(buffer, 0, sizeof(*buffer));
return clock();
}