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| Both sides previous revision Previous revision | Last revision Both sides next revision | ||
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commands:builtin:caller [2012/01/15 09:09] ormaaj Some extra info off the top of my head - needs fact checking. |
commands:builtin:caller [2015/02/15 22:41] iankelling Make things a little clearer. |
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| The code below defines a function ''die'' that is used to exit the program. It prints a list of execution frames, starting with the topmost frame (0). The topmost frame is the "caller of the die function", in this case function "f1". | The code below defines a function ''die'' that is used to exit the program. It prints a list of execution frames, starting with the topmost frame (0). The topmost frame is the "caller of the die function", in this case function "f1". | ||
| - | This way, you can print a kind of "stack trace" for debugging or logging purposes. | + | This way, you can print a "stack trace" for debugging or logging purposes. |
| The code is made very simple, just to show the basic purposes. | The code is made very simple, just to show the basic purposes. | ||
| Line 24: | Line 24: | ||
| die() { | die() { | ||
| local frame=0 | local frame=0 | ||
| - | |||
| while caller $frame; do | while caller $frame; do | ||
| ((frame++)); | ((frame++)); | ||
| done | done | ||
| - | |||
| echo "$*" | echo "$*" | ||
| exit 1 | exit 1 | ||
| } | } | ||
| - | f1() { | + | f1() { die "*** an error occured ***"; } |
| - | die "*** an error occured ***" | + | f2() { f1; } |
| - | } | + | f3() { f2; } |
| - | + | ||
| - | f2() { | + | |
| - | f1 | + | |
| - | } | + | |
| - | + | ||
| - | f3() { | + | |
| - | f2 | + | |
| - | } | + | |
| f3 | f3 | ||
| Line 50: | Line 40: | ||
| **Output** | **Output** | ||
| <code> | <code> | ||
| - | 15 f1 ./callertest.sh | + | 12 f1 ./callertest.sh |
| - | 19 f2 ./callertest.sh | + | 13 f2 ./callertest.sh |
| - | 23 f3 ./callertest.sh | + | 14 f3 ./callertest.sh |
| - | 26 main ./callertest.sh | + | 16 main ./callertest.sh |
| *** an error occured *** | *** an error occured *** | ||
| </code> | </code> | ||