- pull r22872 from trunk:

pidof/killall: allow find_pid_by_name to find running
 processes started as scripts_with_name_longer_than_15_bytes.sh
 closes bug 4054 (and is generally neat)

4 files changed, 51 insertions, 20 deletions

diff --git a/include/libbb.h b/include/libbb.h
index e92dbc4c0..27fb50ae4 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1140,6 +1140,7 @@ typedef struct procps_status_t {
         uint8_t shift_pages_to_bytes;
         uint8_t shift_pages_to_kb;
 /* Fields are set to 0/NULL if failed to determine (or not requested) */
+        uint16_t argv_len;
         char *argv0;
         USE_SELINUX(char *context;)
         /* Everything below must contain no ptrs to malloc'ed data:
@@ -1187,7 +1188,7 @@ enum {
         PSSCAN_UTIME    = 1 << 13,
         PSSCAN_TTY      = 1 << 14,
         PSSCAN_SMAPS    = (1 << 15) * ENABLE_FEATURE_TOPMEM,
-        PSSCAN_ARGVN    = (1 << 16) * (ENABLE_PGREP | ENABLE_PKILL),
+        PSSCAN_ARGVN    = (1 << 16) * (ENABLE_PGREP || ENABLE_PKILL || ENABLE_PIDOF),
         USE_SELINUX(PSSCAN_CONTEXT = 1 << 17,)
         PSSCAN_START_TIME = 1 << 18,
         /* These are all retrieved from proc/NN/stat in one go: */
diff --git a/libbb/find_pid_by_name.c b/libbb/find_pid_by_name.c
index 8dcdb13bc..abfeefd74 100644
--- a/libbb/find_pid_by_name.c
+++ b/libbb/find_pid_by_name.c
@@ -38,6 +38,35 @@ execXXX("/proc/self/exe", applet_name, params....)
 and therefore comm field contains "exe".
 */
 
+static int comm_match(procps_status_t *p, const char *procName)
+{
+        int argv1idx;
+
+        /* comm does not match */
+        if (strncmp(p->comm, procName, 15) != 0)
+                return 0;
+
+        /* in Linux, if comm is 15 chars, it may be a truncated */
+        if (p->comm[14] == '\0') /* comm is not truncated - match */
+                return 1;
+
+        /* comm is truncated, but first 15 chars match.
+         * This can be crazily_long_script_name.sh!
+         * The telltale sign is basename(argv[1]) == procName. */
+
+        if (!p->argv0)
+                return 0;
+
+        argv1idx = strlen(p->argv0) + 1;
+        if (argv1idx >= p->argv_len)
+                return 0;
+
+        if (strcmp(bb_basename(p->argv0 + argv1idx), procName) != 0)
+                return 0;
+
+        return 1;
+}
+
 /* find_pid_by_name()
  *
  *  Modified by Vladimir Oleynik for use with libbb/procps.c
@@ -48,22 +77,18 @@ and therefore comm field contains "exe".
  *  Returns a list of all matching PIDs
  *  It is the caller's duty to free the returned pidlist.
  */
-pid_t* find_pid_by_name(const char* procName)
+pid_t* find_pid_by_name(const char *procName)
 {
         pid_t* pidList;
         int i = 0;
         procps_status_t* p = NULL;
 
-        pidList = xmalloc(sizeof(*pidList));
-        while ((p = procps_scan(p, PSSCAN_PID|PSSCAN_COMM|PSSCAN_ARGV0))) {
-                if (
-                /* we require comm to match and to not be truncated */
-                /* in Linux, if comm is 15 chars, it may be a truncated
-                 * name, so we don't allow that to match */
-                    (!p->comm[sizeof(p->comm)-2] && strcmp(p->comm, procName) == 0)
+        pidList = xzalloc(sizeof(*pidList));
+        while ((p = procps_scan(p, PSSCAN_PID|PSSCAN_COMM|PSSCAN_ARGVN))) {
+                if (comm_match(p, procName)
                 /* or we require argv0 to match (essential for matching reexeced /proc/self/exe)*/
                  || (p->argv0 && strcmp(bb_basename(p->argv0), procName) == 0)
-                /* TOOD: we can also try /proc/NUM/exe link, do we want that? */
+                /* TODO: we can also try /proc/NUM/exe link, do we want that? */
                 ) {
                         pidList = xrealloc(pidList, sizeof(*pidList) * (i+2));
                         pidList[i++] = p->pid;
@@ -74,7 +99,7 @@ pid_t* find_pid_by_name(const char* procName)
         return pidList;
 }
 
-pid_t *pidlist_reverse(pid_t *pidList)
+pid_t* pidlist_reverse(pid_t *pidList)
 {
         int i = 0;
         while (pidList[i])
diff --git a/libbb/procps.c b/libbb/procps.c
index 8946917a2..6e6412bb1 100644
--- a/libbb/procps.c
+++ b/libbb/procps.c
@@ -385,16 +385,15 @@ procps_status_t *procps_scan(procps_status_t* sp, int flags)
                         n = read_to_buf(filename, buf);
                         if (n <= 0)
                                 break;
-#if ENABLE_PGREP || ENABLE_PKILL
                         if (flags & PSSCAN_ARGVN) {
-                                do {
-                                        n--;
-                                        if (buf[n] == '\0')
-                                                buf[n] = ' ';
-                                } while (n);
+                                sp->argv_len = n;
+                                sp->argv0 = xmalloc(n + 1);
+                                memcpy(sp->argv0, buf, n + 1);
+                                /* sp->argv0[n] = '\0'; - buf has it */
+                        } else {
+                                sp->argv_len = 0;
+                                sp->argv0 = xstrdup(buf);
                         }
-#endif
-                        sp->argv0 = xstrdup(buf);
                 }
 #endif
                 break;
diff --git a/procps/pgrep.c b/procps/pgrep.c
index 336fa84ba..f08d6cc5f 100644
--- a/procps/pgrep.c
+++ b/procps/pgrep.c
@@ -111,8 +111,14 @@ int pgrep_main(int argc ATTRIBUTE_UNUSED, char **argv)
                 if (proc->pid == pid)
                         continue;
                 cmd = proc->argv0;
-                if (!cmd)
+                if (!cmd) {
                         cmd = proc->comm;
+                } else {
+                        int i = proc->argv_len;
+                        while (i) {
+                                if (!cmd[i]) cmd[i] = ' ';
+                                i--;
+                }
                 /* NB: OPT_INVERT is always 0 or 1 */
                 if ((regexec(&re_buffer, cmd, 1, re_match, 0) == 0 /* match found */
                      && (!OPT_ANCHOR || (re_match[0].rm_so == 0 && re_match[0].rm_eo == (regoff_t)strlen(cmd)))) ^ OPT_INVERT