pidof: allow to change a separator put between pids
I frequency use pidof command with strace system call tracer. strace can trace MULTIPLE processes specified with "-p $PID" arguments like: strace -p 1 -p 1030 -p 3043 Sometimes I want to do as following strace -p $(pidof httpd) However, above command line doesn't work because -p option is needed for specifying a pid. pidof uses a whitespace as a separator. For passing the output to strace, the separator should be replaced with ' -p '. This maybe not a special to my use case. This commit introduces -S option that allows a user to specify a separator the one wants. $ ./pidof bash ./pidof bash 24624 18790 12786 11898 11546 10766 7654 5095 $ ./pidof -S ',' bash ./pidof -S ',' bash 24624,18790,12786,11898,11546,10766,7654,5095 $ ./pidof -S '-p ' bash ./pidof -S '-p ' bash 24624-p 18790-p 12786-p 11898-p 11546-p 10766-p 7654-p 5095 $ ./pidof -S ' -p ' bash ./pidof -S ' -p ' bash 24624 -p 18790 -p 12786 -p 11898 -p 11546 -p 10766 -p 7654 -p 5095 $ strace -p $(./pidof -S ' -p ' bash) strace -p $(./pidof -S ' -p ' bash) strace: Process 24624 attached strace: Process 18790 attached strace: Process 12786 attached ... Signed-off-by: Masatake YAMATO <yamato@redhat.com>
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parent
1ddd17b17c
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7f5971058a
5
pidof.1
5
pidof.1
@ -27,6 +27,8 @@ pidof -- find the process ID of a running program.
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.IR omitpid[,omitpid..] ]
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.IR omitpid[,omitpid..] ]
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.RB [ \-o
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.RB [ \-o
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.IR omitpid[,omitpid..].. ]
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.IR omitpid[,omitpid..].. ]
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.RB [ \-S
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.IR separator ]
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.B program
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.B program
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.RB [ program.. ]
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.RB [ program.. ]
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.SH DESCRIPTION
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.SH DESCRIPTION
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@ -47,6 +49,9 @@ shells running the named scripts.
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Tells \fIpidof\fP to omit processes with that process id. The special
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Tells \fIpidof\fP to omit processes with that process id. The special
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pid \fB%PPID\fP can be used to name the parent process of the \fIpidof\fP
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pid \fB%PPID\fP can be used to name the parent process of the \fIpidof\fP
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program, in other words the calling shell or shell script.
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program, in other words the calling shell or shell script.
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.IP "-S \fIseparator\fP"
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Use \fIseparator\fP as a separator put between pids. Used only when
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more than one pids are printed for the program.
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.SH "EXIT STATUS"
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.SH "EXIT STATUS"
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.TP
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.TP
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.B 0
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.B 0
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10
pidof.c
10
pidof.c
@ -65,6 +65,7 @@ static int __attribute__ ((__noreturn__)) usage(int opt)
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fputs(_(" -c, --check-root omit processes with different root\n"), fp);
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fputs(_(" -c, --check-root omit processes with different root\n"), fp);
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fputs(_(" -x also find shells running the named scripts\n"), fp);
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fputs(_(" -x also find shells running the named scripts\n"), fp);
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fputs(_(" -o, --omit-pid <PID,...> omit processes with PID\n"), fp);
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fputs(_(" -o, --omit-pid <PID,...> omit processes with PID\n"), fp);
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fputs(_(" -S, --separator SEP use SEP as separator put between PIDs"), fp);
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fputs(USAGE_SEPARATOR, fp);
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fputs(USAGE_SEPARATOR, fp);
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fputs(USAGE_HELP, fp);
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fputs(USAGE_HELP, fp);
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fputs(USAGE_VERSION, fp);
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fputs(USAGE_VERSION, fp);
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@ -290,12 +291,14 @@ int main (int argc, char **argv)
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int found = 0;
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int found = 0;
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int first_pid = 1;
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int first_pid = 1;
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const char *opts = "scnxmo:?Vh";
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const char *separator = " ";
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const char *opts = "scnxmo:S:?Vh";
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static const struct option longopts[] = {
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static const struct option longopts[] = {
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{"check-root", no_argument, NULL, 'c'},
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{"check-root", no_argument, NULL, 'c'},
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{"single-shot", no_argument, NULL, 's'},
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{"single-shot", no_argument, NULL, 's'},
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{"omit-pid", required_argument, NULL, 'o'},
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{"omit-pid", required_argument, NULL, 'o'},
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{"separator", required_argument, NULL, 's'},
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{"help", no_argument, NULL, 'h'},
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{"help", no_argument, NULL, 'h'},
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{"version", no_argument, NULL, 'V'},
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{"version", no_argument, NULL, 'V'},
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{NULL, 0, NULL, 0}
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{NULL, 0, NULL, 0}
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@ -327,6 +330,9 @@ int main (int argc, char **argv)
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pidof_root = pid_link(getpid(), "root");
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pidof_root = pid_link(getpid(), "root");
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}
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}
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break;
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break;
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case 'S':
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separator = optarg;
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break;
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case 'V':
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case 'V':
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printf (PROCPS_NG_VERSION);
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printf (PROCPS_NG_VERSION);
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exit (EXIT_SUCCESS);
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exit (EXIT_SUCCESS);
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@ -360,7 +366,7 @@ int main (int argc, char **argv)
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first_pid = 0;
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first_pid = 0;
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printf ("%ld", (long) procs[i].pid);
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printf ("%ld", (long) procs[i].pid);
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} else {
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} else {
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printf (" %ld", (long) procs[i].pid);
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printf ("%s%ld", separator, (long) procs[i].pid);
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}
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}
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if (opt_single_shot) break;
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if (opt_single_shot) break;
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}
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}
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