diff options
Diffstat (limited to 'libc/posix/wordexp.c')
| -rw-r--r-- | libc/posix/wordexp.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/libc/posix/wordexp.c b/libc/posix/wordexp.c index bf49baab9..96ce8a4b1 100644 --- a/libc/posix/wordexp.c +++ b/libc/posix/wordexp.c @@ -953,7 +953,12 @@ exec_comm (char *comm, char **word, size_t *word_length, size_t *max_length, if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer, bufsize))) < 1) { - if (TEMP_FAILURE_RETRY (__waitpid (pid, &status, WNOHANG)) == 0) + /* If read returned 0 then the process has closed its + stdout. Don't use WNOHANG in that case to avoid busy + looping until the process eventually exits. */ + if (TEMP_FAILURE_RETRY (__waitpid (pid, &status, + buflen == 0 ? 0 : WNOHANG)) + == 0) continue; if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer, bufsize))) < 1) @@ -983,7 +988,12 @@ exec_comm (char *comm, char **word, size_t *word_length, size_t *max_length, if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer, bufsize))) < 1) { - if (TEMP_FAILURE_RETRY (__waitpid (pid, &status, WNOHANG)) == 0) + /* If read returned 0 then the process has closed its + stdout. Don't use WNOHANG in that case to avoid busy + looping until the process eventually exits. */ + if (TEMP_FAILURE_RETRY (__waitpid (pid, &status, + buflen == 0 ? 0 : WNOHANG)) + == 0) continue; if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer, bufsize))) < 1) |