projects / OpenSPARC-T2-DV / blame
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| 55 | <H3><A NAME="SECTION008833000000000000000"> | |
| 56 | 6.8.3.3 Replacing os.system()</A> | |
| 57 | </H3> | |
| 58 | ||
| 59 | <P> | |
| 60 | <div class="verbatim"><pre> | |
| 61 | sts = os.system("mycmd" + " myarg") | |
| 62 | ==> | |
| 63 | p = Popen("mycmd" + " myarg", shell=True) | |
| 64 | sts = os.waitpid(p.pid, 0) | |
| 65 | </pre></div> | |
| 66 | ||
| 67 | <P> | |
| 68 | Notes: | |
| 69 | ||
| 70 | <P> | |
| 71 | ||
| 72 | <UL> | |
| 73 | <LI>Calling the program through the shell is usually not required. | |
| 74 | </LI> | |
| 75 | <LI>It's easier to look at the <tt class="member">returncode</tt> attribute than | |
| 76 | the exit status. | |
| 77 | </LI> | |
| 78 | </UL> | |
| 79 | ||
| 80 | <P> | |
| 81 | A more realistic example would look like this: | |
| 82 | ||
| 83 | <P> | |
| 84 | <div class="verbatim"><pre> | |
| 85 | try: | |
| 86 | retcode = call("mycmd" + " myarg", shell=True) | |
| 87 | if retcode < 0: | |
| 88 | print >>sys.stderr, "Child was terminated by signal", -retcode | |
| 89 | else: | |
| 90 | print >>sys.stderr, "Child returned", retcode | |
| 91 | except OSError, e: | |
| 92 | print >>sys.stderr, "Execution failed:", e | |
| 93 | </pre></div> | |
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| 131 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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