sbase

suckless unix tools
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commit 5c8d5c1dca2b973827cca99136a1f867971cc7f4
parent 7cc4ef0734f77c7b6cd35a6619bafafbe0e68de8
Author: Evan Gates <evan.gates@gmail.com>
Date:   Fri Feb 27 13:31:04 -0800

add time. do not mark complete/POSIX compliant as exit status is wrong.

Diffstat:
Makefile | 1+
README | 1+
time.c | 63+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 65 insertions(+), 0 deletions(-)
diff --git a/Makefile b/Makefile @@ -137,6 +137,7 @@ BIN =\ tar\ tee\ test\ + time\ touch\ tr\ true\ diff --git a/README b/README @@ -74,6 +74,7 @@ The following tools are implemented ('*' == finished, '#' == UTF-8 support, =* tar non-posix none =* tee yes none =* test yes none += time no none (incorrect exit status) =* touch yes none #* tr yes none =* true yes none diff --git a/time.c b/time.c @@ -0,0 +1,63 @@ +#include <stdio.h> +#include <unistd.h> +#include <sys/times.h> +#include <sys/wait.h> + +#include "util.h" + +void +usage(void) +{ + eprintf("usage: %s [-p] utility [argument ...]\n", argv0); +} + +int +main(int argc, char *argv[]) +{ + pid_t pid; + struct tms tms; /* hold user and sys times */ + clock_t rbeg, rend; /* real time */ + long ticks; /* per second */ + int status; + + ARGBEGIN { + case 'p': + /* used to specify POSIX output format, but that's the only format we + * have for now */ + break; + default: + usage(); + } ARGEND; + + if (!*argv) + usage(); + + if ((ticks = sysconf(_SC_CLK_TCK)) < 0) + eprintf("sysconf() failed to retrieve clock ticks per second:"); + + if ((rbeg = times(&tms)) < 0) /* POSIX doesn't say NULL is ok... */ + eprintf("times() failed to retrieve start times:"); + + if (!(pid = fork())) { /* child */ + execvp(*argv, argv); + /* FIXME: check errno for POSIX exit status + * 126: found could not be invoked + * 127: could not be found + * problem is some like EACCESS can mean either... + * worth doing manual path search for correct value? also gives more + * accurate time as the patch search wouldn't be included in child's + * user/sys times... */ + enprintf(127, "failed to exec %s:", *argv); + } + waitpid(pid, &status, 0); + + if ((rend = times(&tms)) < 0) + eprintf("times() failed to retrieve end times:"); + + fprintf(stderr, "real %f\nuser %f\nsys %f\n", + (rend - rbeg) / (double)ticks, + tms.tms_cutime / (double)ticks, + tms.tms_cstime / (double)ticks); + + return WIFEXITED(status) ? WEXITSTATUS(status) : 0; +}